JPH05229018A - Production of cylindrical laminate due to filament winding molding method - Google Patents

Abstract

PURPOSE:To enhance productivity by winding a highly elastic reinforcing fiber impregnated with a resin without generating the cutting of the fiber by parallelly arranging a yarn positioning guide composed of a pin row and a yarn turning- back guide to at least one place of a mandrel. CONSTITUTION:Yarn composed of a resin impregnated reinforcing fiber bundle (e.g. resin impregnated carbon fiber bundle) 4 is wound around a mandrel 3 and the resin of the yarn is cured to obtain a cylindrical laminate. In this case, the mandrel 3 is constituted by arranging two guide groups each of which consisting of a pin row 1 formed, for example, by radially arranging 36 fine yarn positioning guide pins with a diameter of about 2mm at an equal interval and a pin row formed, for example, by radially arranging 12 tapered yarn turning-back guide pins with a base diameter of about 10mm at an equal interval so as to provide an interval therebetween. By this constitution, the reinforcing fiber bundle 4 can be continuously wound by the yarn turning-back guide pin row 2 without being broken and a cylindrical molded product of high quality is produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This method is a filament winding molding method capable of providing a tubular molded body having a desired shape by using a highly elastic reinforcing fiber having a small breaking strain, which cannot be molded by the filament winding method in the conventional technique. To a method for manufacturing a tubular laminate.

[0002]

2. Description of the Related Art A filament winding method is often used as one of the general methods for producing a tubular laminate containing reinforcing fibers. Then, the reinforcing fiber impregnated with the resin is wound around the mandrel so as to have a desired laminated structure,
Then, in the filament winding method in which the resin is cured by heat or the like and molded, generally, the reinforcing fibers are often oriented at a plurality of angles so as to meet the required performance of the molded body.

In particular, when molding a highly rigid cylindrical body, high rigidity is exhibited by winding a highly elastic reinforcing fiber at a low angle with respect to the axial direction of the cylindrical body. When the reinforcing fiber is wound at a low angle with respect to the mandrel axis by the filament winding method as described above, after winding a desired length on the mandrel, the reinforcing fiber is continuously wound while being folded back. Will be done. Conventionally, as a mandrel, a cylindrical mandrel over the entire length, a dome-shaped mandrel at both ends, a mandrel having a pin for fixing a yarn at both ends, and the like have been used.

[0004] For example, a carbon fiber reinforced resin cylinder formed by a filament winding method using a cylindrical mandrel is used as a raw pipe for industrial rolls for film production, papermaking, printing and the like. The performance requirements for these industrial rolls are high rigidity, little bending, light weight, and small moment of inertia.

In particular, a carbon fiber reinforced resin tubular body manufactured by the filament winding method is lighter in weight than a metallic tubular body and can be designed to have a higher bending rigidity than a metallic tubular body even if the tubular body has the same size, and the tubular body has a high rigidity. Since the deflection in the cutting / grinding process in rolling is small, it is possible to contribute to the improvement of productivity in these industries and further to the improvement of product accuracy, so that the demand is increasing in recent years.

[0006]

However, these mandrels conventionally used by the filament winding method have the following problems. That is, since the cylindrical mandrel does not have a yarn catching portion and the angle at which the yarn can be wound is limited, the physical properties of the reinforcing fiber cannot be effectively utilized in the axial direction of the cylindrical body.

If the mandrel has dome-shaped end portions, it is difficult to stabilize the path in winding at a low angle, and the yarn position is likely to shift, which may cause a thread breakage or a reinforcing fiber. The orientation is disturbed in the vicinity of the dome, so that it is necessary to wind the cylindrical laminate over a desired length. In addition, since the length to be wound is uniquely determined for a mandrel with both ends dome-shaped, if cylinders with different lengths are required, prepare mandrels of different lengths one by one, or more than long mandrels. It takes a long time to wind and consumes extra raw materials and time.

In the pin type, the yarn can be arranged at a desired angle by fixing the yarn at the pin portion, but when the reinforcing fiber having a relatively small breaking strain, for example, a carbon fiber having a high elastic modulus is wound. However, there was also a problem that a thread breakage occurred at the pin portion when it was folded back, and it could not be wound. For these reasons, in the filament winding method using the reinforcing fiber having a high elastic modulus, the productivity is low due to the stop of the device due to the occurrence of yarn breakage, the waste of the raw material of the extra winding portion, and the like. Further, when the apparatus is stopped due to such yarn breakage, the tension of the carbon fiber yarn becomes non-uniform, which often adversely affects the physical properties of the molded product.

[0009]

As a result of diligent studies, the present inventors have found that such problems can be solved by installing two types of guide pins of a specific size on the mandrel. Arrived That is, the object of the present invention is to be able to wind a reinforcing fiber at a free angle and to use a high-strength or high-elasticity reinforcing fiber with a small breaking strain, and as a result, a tubular molded body with desired performance can be easily obtained. The present invention is to provide a method for manufacturing a tubular laminate by a filament winding molding method, and an object thereof is to wind a yarn made of a reinforcing fiber impregnated with a resin using a mandrel and then cure the resin. In a method for manufacturing a tubular laminate by a molding method, a yarn positioning guide made of a pin row and a yarn folding guide made of a pin row thick enough not to damage the yarn are substantially parallel to at least one location of the mandrel. The method for manufacturing a tubular laminate by the filament winding molding method, which is installed together with the Look, the yarn positioning guide pin row is in the front, and the two sets of pin row groups that are combined so that the yarn folding back guide pin row is on the outside are installed and fixed at any two points apart on the cylindrical mandrel. When winding the reinforcing fiber bundle in the range of 0 to 30 degrees with respect to the mandrel axis, the angle of the yarn is set by the yarn positioning guide pin, and the yarn is folded back by the yarn folding guide pin. The method for producing a tubular laminate by the above-mentioned filament winding molding method for forming a tubular laminate is easily achieved.

The present invention will be described in more detail below. In the present invention, the mandrel has, at least at one location thereof, a jig for yarn folding back, which comprises a set of yarn positioning guide pin rows and a yarn folding back guide pin row. The positions of the respective guide pins are set in the order of the yarn positioning guide pin row and then the folded back guide pin row toward the end of the mandrel when viewed from the portion of the mandrel subject to filament winding winding.

The yarn positioning guide pins are radially installed along the outer periphery of the mandrel so as to match the filament winding winding pitch interval of the yarn. The diameter of the yarn positioning guide pin is preferably small so that the winding pitch can be set finely in the pin row, but the required diameter is naturally determined by the tension applied to the yarn and is a cylindrical shape of about 1 to 5 mm. Those are particularly preferable.

In the yarn folding guide pin array, pins having a diameter large enough not to cut the impregnated fiber bundle are radially installed along the outer circumference of the mandrel according to the winding pitch interval. It is preferable that the yarn folding guide pin has a taper so that the impregnated fiber yarn is prevented from coming off the pin and is stabilized on the mandrel side. More preferably, the head of the pin has a hemispherical shape so that the pin does not damage the yarn. It is desirable that these guide lines for turning back the yarn are installed after the resin-impregnated reinforcing fiber yarn is fixed, preferably until the resin is cured, and then removed.

Further, both guide pin surfaces should have small friction so as not to damage the reinforcing fiber. The yarn folding back guide pin row and the yarn positioning guide pin row do not necessarily have to be arranged one by one, and two or more guide pin rows may be provided as needed. In that case, each guide pin row may be provided. May be arranged in parallel or may be staggered. Also, the ring for attaching the guide pin row should have the minimum necessary thickness so that the yarn wound at a low angle is as close as possible to the mandrel, but some clearance is higher than the mandrel axis. This can be avoided by winding the reinforcing fiber layer wound at an angle and the reinforcing fiber yarn in the mandrel circumferential direction.

In the present invention, the term "cylindrical" includes not only a cylindrical shape but also a cylinder having a polygonal vertical cross section.

[0015]

EFFECTS OF THE INVENTION According to the above method, even in the case of a highly elastic reinforcing fiber having a relatively small breaking strain, there is no yarn breakage,
In addition, productivity is increased by reducing unnecessary parts other than the required length, and it is possible to provide a uniform fiber-reinforced resin composite material over the entire molded body, and the cylindrical body can be wound at almost the desired length, which is expensive. There is no waste of various materials, and the cylinder can be inexpensively supplied.

[0016]

EXAMPLES Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to the following examples unless it exceeds the gist.

[0017]

[Embodiment 1] As shown in FIG. 1, 36 rows of thin yarn positioning guide pins having a diameter of 2 mm are arranged at equal intervals and in a radial pattern, and a yarn folding guide with a taper of 10 mm at the root diameter. A group of pin rows 2 in which 12 pins are arranged at equal intervals and in a radial pattern, has a diameter of 60 mm and a length of 1500.
Impregnated carbon fiber bundles 4 by the filament winding method using the winding mandrel 3 in which two groups of pin rows are spaced by 500 mm on the mm mandrel.
Was wound. As the carbon fiber, pitch-based carbon fiber "DIAREAD K137" was used.

The elastic modulus of the carbon fiber is 65 ton / mm ² ,
The minimum diameter of the impregnated carbon fiber bundle 4 that can be wound is about 7 m.
m. In the first layer, the impregnated fiber bundle is wound inside the yarn positioning guides on both sides in a direction of approximately 90 degrees to the axial direction of the mandrel, and the second layer is installed on the yarn positioning pin rows 1 on both sides of the mandrel and outside thereof. By using the above-described thread-folded pin row 2, the impregnated fiber bundle is wound at an angle of ± 10 degrees with respect to the mandrel axial direction, and further, in the same manner as in the first layer, in the direction of approximately 90 degrees. By winding and tightening, a cylindrical laminated body composed of three layers was formed. The cylindrical laminate wound around the mandrel 3 was placed in an oven together with the mandrel 3 and cured and molded at a predetermined temperature for resin curing.

Highly elastic carbon fibers could be continuously wound without breaking the carbon fibers in the yarn folding back guide pin row 2, and a desired cylindrical molded body was obtained.

[0020]

[Comparative Example] Remove the yarn folding pin row shown in Example 1,
An attempt was made to form a cylindrical laminated body similar to that of the example, using only the yarn positioning pin row which is a conventional technique. The desired cylindrical laminate could not be obtained because the impregnated carbon fiber bundle was frequently cut by the positioning guide pin having a diameter of 2 mm in the second layer winding of ± 10 degrees.

[Brief description of drawings]

FIG. 1 is an example of a mandrel of the present invention, showing a group of a yarn positioning pin array and a yarn folding pin array installed at an arbitrary position of the mandrel, and the yarn is folded and wound. ..

[Explanation of symbols]

 1 Thread Positioning Pin Row 2 Thread Folding Pin Row 3 Mandrel 4 The Impregnated Carbon Fiber Bundle

Claims (2)

[Claims] 1. A method for producing a tubular laminate by a filament winding molding method, comprising winding a thread made of a reinforcing fiber impregnated with a resin using a mandrel, and then hardening the resin, at least at one location of the mandrel. A cylindrical laminated body formed by a filament winding molding method, in which a yarn positioning guide made of a pin row and a yarn folding guide made of a thick pin row so that the yarn is not damaged are installed substantially parallel to each other. Manufacturing method. 2. A set of two pin row groups, in which the yarn positioning guide pin row is on the front side and the yarn folding back guide pin row is on the outer side as viewed from the already wound target portion of the yarn mandrel. Each of them is installed and fixed at any two points apart from each other on the cylindrical mandrel, and when the reinforcing fiber bundle is wound in the range of 0 to 30 degrees with respect to the mandrel axis, the yarn positioning guide pin is used to The method for producing a tubular laminate by the filament winding molding method according to claim 1, wherein an angle is set and the yarn is folded back by the yarn folding guide pin to form a cylindrical laminate.