JPS6398428A - Manufacture of belt with thorn to be used for winding processing of filament - Google Patents

Abstract

PURPOSE:To obtain a belt with thorns whose manufacture is easy and arrangement of the thorns can be set up freely, by forming the thorns with a roving to be wound round a square mandrel. CONSTITUTION:A rising tip part from a fabric 17 of a roving 14 wound round a square mandrel 11 made of a reinforcing fiber such as glass or the like forming a cylindrical state of a square cross section is cut into a needlelike state and control of rising dimensions of each roving 14 is performed. Then the fabric 17 is cut off at a cut-off line C in a longitudinal direction at the central part of a peel ply 16 and the peel plies 13, 16 are removed. With this construction, the belt 22a being formed of the fabric 17 and a belt 22 with thorns where the thorns 22b are formed of the rising part from the fabric 17 of the roving 14 is completed.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention is aimed at making the skin thickness uniform in the axial direction in filament winding processing, etc. in which rovings such as prepreg glovings are wound around a conical mandrel. The present invention relates to a method of manufacturing a barbed belt that is attached to the outer surface of a mandrel for the purpose of embedding.

(Prior Art) Conventionally, as shown in, for example, Japanese Patent Publication No. 60-30548 or Japanese Patent Application Laid-Open No. 56-162615,
A filament winding method is generally known in which prepreg globbing is cross-wound around the outer peripheral surface of a mandrel.

By the way, the conventional helical winding is
As shown in Figure 9, when applied to a conical mandrel 1 whose diameter changes in the axial direction, the thickness of the skin 2 increases in inverse proportion to the diameter, ensuring sufficient skin thickness at the large diameter part. If so, there is a problem that the overall weight increases.

Therefore, as shown in Figure 20, some methods have been proposed, such as hand-laying up reinforcing ply 3 on the large diameter side to balance the strength and thickness of the skin as a whole, or
As shown in FIG. 1 when the mandrel 1 is unfolded, a method has been proposed in which prepreg globbing 4 is wound around the mandrel 1 with angle changes.

(Problem to be Solved by the Invention) By the way, the former method using the reinforcing ply 3 can balance the skin thickness without causing a decrease in the strength of the large diameter portion, but the hand lay-up of the reinforcing ply 3 has many problems. This method requires many man-hours and has a problem of poor productivity.

In addition, the latter method, in which the prepreg globbing 4 is changed in angle, theoretically allows winding with a constant plate thickness, but it is said that the deviation between the stress direction within the member plane and the fiber direction is large, reducing the efficiency of fiber reinforcement. There's a problem. In addition, since the pre-pre-gloving 4 is wound under tension, the pre-pre-pre-gloving 4 tries to form a straight line and slips at the sharply curved part of the pre-pre-gloving 4 indicated by the symbol A in FIG. 21, causing slippage. Another problem is that it is difficult to wrap at an angle.

Therefore, the present inventor placed a barbed belt in which a number of barbs were implanted on the outer surface of the conical mandrel,
A filament winding method was devised in which prepreg globbing, which is cross-wound around the outer peripheral surface of a mandrel, is hooked onto the barbs of the barbed belt and wound while changing its winding direction. By using this type of processing method, the skin thickness can be made uniform without causing slippage in the repli-pre gloving using the reinforcing ply, and high fiber reinforcement efficiency can be obtained.

The present invention relates to a method for manufacturing a barbed belt mainly used in this type of filament winding process, and an object of the present invention is to provide a method for manufacturing a barbed belt that is easy to manufacture and allows the arrangement of barbs to be freely set. .

[Structure of the invention]

(Means for Solving the Problems) The present invention comprises a first step of spirally winding a roving around the outer peripheral surface of a mandrel having a rectangular bar shape and having a large number of longitudinal grooves at required intervals on both side surfaces; A second step in which a plurality of mandrels and square rod-shaped flexible materials obtained in the process are arranged alternately in the width direction on the fabric and pressed from both sides to bring them into close contact; A third step of cutting off the roving wrapped around two sides, a fourth step of heating and curing the roving obtained in the third step and removing the mandrel and flexible outer material, and a fourth step of removing the mandrel and flexible outer material. The present invention is characterized by comprising a fifth step of cutting the fabritta into a predetermined shape to obtain a barbed belt in which the fabritta forms a belt and the portions standing up from the roving fabric form barbs.

(Function) In the method for manufacturing a belt with barbs according to the present invention, since the barbs are formed by the rovings wound around the mandrel, production is easy, and the pitch of the rovings being wound around the mandrel is changed. This allows you to freely change the spacing between the thorns. Furthermore, since the portion of the roving that is wrapped around the bottom surface of the mandrel is integrated with the fabricator, a thorn with sufficient strength can be obtained. By forming the roving and the fabricator from a material that can be joined to the roving wound around the conical mandrel, the roving and the fabricator can be well integrated with the roving.

(Example) An example of implementing the present invention will be briefly described below with reference to the drawings.

First, as shown in FIGS. 1 to 3, a rectangular mandrel 11 made of glass or other reinforcing fibers is used, which has a rod shape with a square cross section and has a large number of vertical grooves 12 at predetermined intervals on both sides.
Its both sides 11a, lla and bottom surface], 1b,
Beer ply made of a woven fabric made of polyamide resin or the like and having a peeling function] 3. From above, a roving 14 made of carbon or the like is spirally wound around the outer peripheral surface of the mandrel 11 in alignment with each of the vertical grooves 12.

Next, as shown in FIG. 4, a flexible material 15 made of silicone rubber or the like, which is rod-shaped with a square cross section and has a predetermined heat resistance, is used, and both sides 15a of the flexible material 15 are formed.

15a and the bottom surface 15b are covered with a beer ply 16 made of the same material as the beer ply 13. Note that the beer plies 13 and 16 can also be omitted.

Next, as shown in FIG. 5, a required number of carbon prepreg fabrics are laid up to form a fabric 17.
A plurality of mandrels 11 in the state shown in FIG. 3 and flexible members 15 in the state shown in FIG. 4 are arranged alternately in the width direction on the negative side thereof.

Then, these are pressed from both sides with the presser metal 18 to bring them into close contact.

Next, as shown in FIG. 6, both ends of the roving 14 wound around the upper surface 11c of each mandrel 11 are cut in the longitudinal direction of the mandrel 1 using a knife 19.
Remove this. As a result, the state shown in FIG. 7 is obtained.

Therefore, as shown in FIG. 8, this is wrapped in a bag 20 and the inside is evacuated, and in this state, it is placed in an autoclave furnace and heated and cured. After curing, the bag 20 is removed, as well as the mandrel 11 and flexible material 15.

Next, as shown in FIG. 9, the rising end of the roving 14 from the fabric 17 is cut into a needle shape using a grinder 21 or the like, and the rising dimension of each roving 14 is adjusted.

Next, as shown in FIG. 10, the fabric 17 is cut along the cut line C in the longitudinal direction at the center of the beer ply 16, and the beer ply 13.16 is removed by =7-. As a result, the fabric 17 forms a belt 22a as shown in FIG. 11 and FIG.
The barbed belt 22 having the shape b is completed.

This barbed belt 22 has a recess 23a provided in a conical mandrel 23 as shown in FIGS. 13 to 17.
The belt 22a is attached to the outer surface of the mandrel 23 with the belt 22a dropped therein. Note that the beer plies 13 and 16 may be removed at this time.

Then, on the outer peripheral surface of this mandrel 23, prepreg globbing 25 arranged in a tape shape with a predetermined width and a predetermined pressure is cross-wound through the delivery eye 24, and
The winding direction is changed by hooking on the barb 22b.

The barbed belt 22 is placed on the periphery of the opening 26 provided in the mandrel 23 or on the reinforced part of the mandrel 23, as shown in FIG. You can do it like this.

In this way, since the roving] 4 is spirally wound around the square mandrel 11 to form the barbs 22b,
It is easy to manufacture the barb 22b, and the roving 1
By changing the winding pitch of 4 on the mandrel 11, the interval between the barbs 22b can be freely adjusted. Further, since the roving 14 is disposed within the longitudinal groove 12 of the mandrel 11, when assembled in the state shown in FIG.
It won't collapse. Also, mandrel 11 of roving 14
Since the portion disposed on the bottom surface 11b is integrated with the fabric 17, sufficient strength of the barbs 22b can be obtained. Moreover, the barbed belt 22 is made of carbon, for example, and can be joined to the prepreg gloving 25, so that the prepreg gloving 25 and the barbed belt 22 can be completely integrated. Furthermore, since the tip of the barb 22b is cut into a needle shape, when the prepure gloving 25 is wound around the outer peripheral surface of the mandrel 23, the prepreg globbing 25 is attached to the barb 22b.
5 is caught and the barb 22b does not fall down.

In addition, in the example of the embodiment, the barb 22b is attached to the bell l.
-22a are arranged in one row, but multiple rows may be used if necessary, and the arrangement of 1f22b can also be freely set in a grid pattern, staggered pattern, etc.

In addition, in the example of the embodiment described above, the belt 22a and the barb 22b are made of carbon, but other materials such as glass or other reinforcing fibers can be used as long as they can be bonded in the same range as the prepreg gloving 25. You can do it like this. Note that roving does not necessarily have to be pre-pre-gloving.

〔Effect of the invention〕

As explained above, in the present invention, since the thorns are formed by the rovings wound around the rectangular mandrel, manufacturing is easy, and the winding of the rovings around the mandrel is controlled by the pitch and the arrangement position of the mandrel. By changing it, you can freely change the arrangement of the thorns.

Furthermore, since the portion of the roving that is wrapped around the bottom surface of the mandrel is integrated with the fabric, a thorn with sufficient strength can be obtained.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the state in which roving is wrapped around a rectangular bar-shaped mandrel, Figure 2 is an enlarged view of the main part of Figure 1, and Figure 3 is an illustration showing how roving is wound around a mandrel via peel ply. 4 is a sectional view showing the state in which the flexible material is covered with peel ply, and FIGS. 5 to 11 are the mandrel shown in FIG. 3 and the flexible material shown in FIG. 4. FIG. 12 is a perspective view of FIG. 11, FIG. 13 is a front view of the mandrel with the barbed belt attached, and FIG. An explanatory view showing the filament winding processing method using this mandrel, FIG. 15 is a right side view of FIG. 14, FIG. 16 is a cross-sectional view of the main part of the mandrel showing how the barbed belt is placed on the mandrel, and FIG. 17 The figure is a developed view of the mandrel in Figure 14, Figure 18 is a view equivalent to Figure 14 showing other ways of installing the barbed belt, and Figure 19 is the skin thickness when prepreg gloving is cross-wound around a conical mandrel. Explanatory diagram showing changes in , 2nd
FIG. 0 is an explanatory view showing a conventional method for making the skin thickness uniform using reinforcing plies, and FIG. 21 is a developed view of a mandrel showing a conventional method for making the skin thickness uniform by changing the wrap angle of pre-pre-gloving. 11... Square mandrel, 11 a + 15 a
... Side, 11b, 15b... Bottom, 11C...
Upper surface, 12... Vertical groove, 1.3.16... Peel ply, 14... Roving, 15... Flexible material, 17
... Fabric, 20... Bag, 22... Belt with barbs, 22a... Belt, 22b... Thorns, 2
5... Pre-pre-gloving.

Claims (1)

[Scope of Claims] 1. A first step of spirally winding a roving in accordance with each of the longitudinal grooves on the outer peripheral surface of a mandrel having a rectangular bar shape with a large number of longitudinal grooves at required intervals on both sides; A second step in which a plurality of mandrels and square rod-shaped flexible materials obtained in the first step are alternately arranged in the width direction on a fabric that can be joined to the roving, and are pressed from both sides to make them stick together. and a third roving that cuts the roving wrapped around the top surface of each mandrel along the longitudinal direction of the mandrel.
A fourth step of heating and curing the material obtained in the third step, removing the mandrel and the flexible material, and cutting the fabric obtained in the fourth step into a predetermined shape so that the fabric forms a belt. A method for manufacturing a barbed belt used in filament winding processing, etc., comprising a fifth step of obtaining a barbed belt in which the portions rising from the roving fabric form barbs. 2. The method for manufacturing a barbed belt used in filament winding processing, etc. as claimed in claim 1, wherein the tip of each barb is processed into a needle shape after the fourth step.