KR20180133716A - Apparatus and method for menufacturing continuous fiber reinforced composites having twist type hollow profiles structure - Google Patents

Abstract

An apparatus and a method for manufacturing a continuous fiber composite material having a twist type hollow profile structure using a simple device such as a roller and a mandrel are disclosed. The apparatus for manufacturing the continuous fiber composite material having the twisted hollow profile structure according to the present invention comprises: a roller on which a prepreg sheet is wound on a rotating shaft; a mandrel winding the prepreg sheet on an outer circumferential surface thereof; a pulling unit pulling the prepreg sheet in the vertical direction with respect to the winding direction of the prepreg sheet so that the prepreg sheet is wound in a spiral shape on the outer peripheral surface of the mandrel; and a cutting section cutting the spirally wound prepreg sheet.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a continuous fiber composite material having a twisted hollow profile structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous fiber composite material manufacturing technology, and more particularly, to a manufacturing apparatus and a manufacturing method of a continuous fiber composite material having a twisted hollow profile structure using simple devices such as rollers and mandrels.

Fiber Reinforced Plastic (FRP), which is widely regarded as a new material, exhibits excellent mechanical properties such as specific stiffness and specific strength compared with general metal materials, It is widely used in various industrial fields.

As shown in Figs. 1 and 2, a fiber-reinforced composite material is manufactured using a thermo pultrusion and a braiding device.

For example, the roving krill 10 is fed with fiber yarns pulled, then laminated and arranged. The laminated and arranged fiber yarns are impregnated into the resin, compressed and pulled. Next, the drawn product is cured and then cut to a desired size to produce a fiber-reinforced composite material.

However, this approach has difficulties in producing continuous fiber composite materials having twisted structures in which fiber yarns are twisted because of the slow processing speed, costly equipment and high process cost.

Therefore, there is a need to develop a manufacturing technology of a continuous fiber composite material having a twisted hollow profile structure using relatively simple equipment as compared with the conventional device.

Related publications are disclosed in Korean Patent Laid-Open Publication No. 2000-0015333 (published on Mar. 15, 2000), which discloses a method for manufacturing a fiber-reinforced composite material by drawing and a manufacturing apparatus thereof.

An object of the present invention is to provide an apparatus for producing a continuous fiber composite material having a twisted hollow profile structure.

It is another object of the present invention to provide a method for producing a continuous fiber composite material having a twisted hollow profile structure using the above production apparatus.

According to an aspect of the present invention, there is provided an apparatus for manufacturing a continuous fiber composite material having a twisted hollow profile structure, comprising: a roller on which a prepreg sheet is wound; A mandrel for winding the prepreg sheet on an outer circumferential surface thereof; A pulling unit for pulling the prepreg sheet in a vertical direction with respect to a winding direction of the prepreg sheet so that the prepreg sheet is wound spirally on the outer circumferential surface of the mandrel; And a cutting section for cutting the spirally wound prepreg sheet.

And a heating unit disposed outside the mandrel to heat the prepreg sheet wound on the outer circumferential surface of the mandrel.

The heating part may be adjusted to 30 to 300 ° C.

The prepreg sheet may include continuous fibers having a single directional orientation.

The pulling unit can impart a tensile force of 1 to 50 N / m to the prepreg sheet.

The rotation speed of the pulling unit may be 5 to 50 m / min.

According to another aspect of the present invention, there is provided a method of manufacturing a continuous fiber composite material having a twisted hollow profile structure, the method comprising: (a) providing a roller on which a prepreg sheet is wound, (b) winding the prepreg sheet on an outer circumferential surface of the mandrel to connect the prepreg sheet to a pulling unit; (c) pulling the prepreg sheet in a direction perpendicular to the winding direction of the prepreg sheet by the pulling unit so that the prepreg sheet is wound spirally on the outer circumferential surface of the mandrel; And (d) cutting the spirally wound prepreg sheet to produce a continuous fiber composite material having a twisted hollow profile structure.

The prepreg sheet may include continuous fibers having a single directional orientation.

In the step (c), heating may be performed at 30 to 300 ° C.

In the step (d), the pulling unit may impart a tensile force of 1 to 50 N / m to the prepreg sheet.

In the step (d), the rotation speed of the pulling unit may be 5 to 50 m / min.

In the step (d), the twist angle may be adjusted to 10 to 60 degrees.

An apparatus for manufacturing a continuous fiber composite material having a twisted hollow profile structure according to the present invention is an apparatus including a roller, a mandrel, a heating unit, and a cut-out unit in which a prepreg sheet is wound, The continuous sheet composite material having a twisted hollow profile structure can be manufactured by winding the sheet on the outer peripheral surface of the mandrel.

According to the present invention, a continuous fiber composite material having a twisted hollow profile structure can be manufactured without a separate pultrusion and braiding device, and the process equipment cost can be reduced and the process time can be shortened.

1 is a configuration diagram of a drawing and forming apparatus according to the prior art.
2 is a block diagram of a conventional braiding device.
3 is a structural view showing an apparatus for producing a continuous fiber composite material having a twisted hollow profile structure including a roller, a mandrel and a heating unit according to the present invention.
4 is a plan view in which continuous fibers according to the present invention are arranged in the longitudinal direction of a prepreg sheet.
5 is a photograph showing a prepreg sheet in a twisted state using a roller and a mandrel according to the present invention.
6 is a cross-sectional view of a continuous fiber composite material having a twisted hollow profile structure showing a twist angle &thetas; according to the present invention.
7 is a view illustrating a state in which a mandrel having a prepreg sheet wound thereon is inserted into a heating unit according to the present invention and heated.
8 is a flowchart showing a method for producing a continuous fiber composite material having a twisted hollow profile structure according to the present invention.
9 is a structural view showing an apparatus for producing a continuous fiber composite material having a twisted hollow profile structure including a roller, a mandrel, a heating unit, a pulling unit, and a cutting unit according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and a method for manufacturing a continuous fiber composite material having a twisted hollow profile structure according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Conventional methods using a drawing-forming apparatus and a braiding (20) apparatus have a disadvantage in that the processing speed is slow, the waste of fibers occurs, and expensive equipment is required.

The present invention can produce a continuous fiber composite material having a twisted hollow profile structure by using simple equipment such as rollers, mandrels, etc. from preforms containing continuous fibers having a unidirectional orientation.

3 is a structural view showing an apparatus for producing a continuous fiber composite material having a twisted hollow profile structure including a roller, a mandrel and a heating unit according to the present invention.

Referring to FIG. 3, an apparatus for producing a continuous fiber composite material 100 having a twisted hollow profile structure includes a roller 30, a mandrel 40, a heating portion 50, and a cut portion (not shown).

The roller (30)

The roller shows a form in which a prepreg sheet is wound on a rotating shaft, and the prepreg sheet shows a semi-hardened laminated form in which fibers are preliminarily impregnated with a binder such as a resin.

The prepreg sheet of the present invention is a UD prepreg containing continuous fibers having a unidirectional orientation and means a semi-cured composite sheet impregnated with continuous fibers arranged in a certain direction in the resin. The continuous fibers may be arranged in the longitudinal direction of the prepreg sheet, and the continuous fibers may be arranged in the width direction of the prepreg sheet. In the present invention, it is assumed that the continuous fibers 70 are arranged in the longitudinal direction of the prepreg sheet 60 as shown in Fig.

The prepreg sheet of the present invention may contain 20 to 80 parts by weight of continuous fibers per 100 parts by weight of the thermoplastic resin, but is not limited thereto. The thickness of the prepreg sheet of the present invention can be adjusted depending on the type and content of the continuous fibers, and may be about 0.1 to 0.5 mm.

The thermoplastic resin may be an aromatic vinyl resin, a rubber modified aromatic vinyl resin, a polyphenylene ether resin, a polycarbonate resin, a polyester resin, a methacrylate resin, a polyarylene sulfide resin, a polyamide resin , A polyvinyl chloride resin, and a polyolefin resin.

The continuous fiber may include at least one of carbon fiber, glass fiber and aramid fiber. The continuous fibers mean that the continuous fibers are present in a continuous form without being broken inside thereof depending on the final size of the composite material to be produced. For example, as continuous fibers in a UD sheet (unidirection sheet), the continuous fibers can be produced by a continuous process, and by continuously supplying the continuous fibers to the continuous process, a composite material containing continuous fibers is produced can do. Thus, the composite material can be made into a product of a particular shape, such as a sheet, wherein the continuous fiber has a certain range of length depending on the shape of the product. However, the length of such a specific range should be regarded as having 'continuity' in that it can be arbitrarily adjusted in the manufacturing process in which continuous fibers are continuously fed, and most of the continuous fibers such as UD sheets or continuous fibers in the fabric , It has continuity without breaking inside the product.

The prepreg sheet can secure an excellent strength improving effect of the composite material along the arrangement direction of the continuous fibers and more preferably includes the continuous fibers having the unidirectional orientation more than the disordered arrangement direction in order to improve the strength of the composite material Do.

The mandrel (40)

As shown in Fig. 3, the prepreg sheet is wound spirally on the outer circumferential surface of the mandrel about the rotation axis. The mandrel can be heated according to the temperature of the heating part 50 without rotating, and can be replaced with a mandrel having a different size or shape. However, the present invention is not limited to this, but it is possible to easily form a hollow profile structure by mounting a separate heating part in the mandrel.

The mandrel may be formed of a stainless steel material which is easy to conduct heat and has less friction with the prepreg sheet, and the surface of the mandrel of the stainless steel material may be plated with zinc or coated with Teflon.

The mandrel may have a shape of a rectangle, a circle, a polygon, or the like depending on the shape of the composite material. The mandrel exists in the heating space, which will be described later, but does not exist in the pooling unit space, and only the continuous fiber composite material having the hollow profile structure remains in the pooling unit space.

The heating unit 50,

The heating part is a space for heating the winded prepreg sheet, and clearance (pores) between the prepreg sheets wound by heating is removed, and the bonding force is increased to produce an integrated continuous fiber composite material.

The heating unit is preferably disposed outside the mandrel so as to heat the prepreg sheet wound on the outer circumferential surface of the mandrel.

The heating unit is preferably controlled to a temperature higher than the melting point of the thermoplastic resin included in the prepreg sheet by 30 to 80 ° C.

For example, the heating part is preferably adjusted to 30 to 300 캜, and if the temperature is lower than 30 캜, the thermoplastic resin is not melted and the moldability and workability of the continuous fiber composite material may be deteriorated. If the temperature is higher than 300 ° C, the thermoplastic resin may be decomposed to deteriorate the properties of the continuous fiber composite material.

As described above, it is preferable that the heating portion is disposed outside the mandrel. As shown in FIG. 3, the heating portion may be formed as an upper heating portion and a lower heating portion around the mandrel. Further, as shown in Fig. 7, the heating portion may be formed so as to insert the mandrel.

The pulling unit 55,

In order to produce a continuous fiber composite material having a twist profile structure, there is a tension that pulls the prepreg sheet wound on the mandrel. This function is performed by a pulling unit.

That is, the pulling unit pulls the sheet in a direction perpendicular to the winding direction of the prepreg sheet so that the prepreg sheet is wound spirally about the rotation axis. As shown in FIG. 9, the pulling unit is of a double belt type, and a belt rotatable in each of the upper and lower portions is formed on the basis of a space in which the twist type prepreg sheet is inserted, The leg sheet is pulled. The belt may be formed of a material such as rubber with high friction.

The pulling unit can pull the prepreg sheet while rotating, whereby the prepreg sheet can be wound in twisted twisted form. As shown in Fig. 5, the twisted shape is a shape in which the prepreg sheet is not continuous with the longitudinal direction of the hollow profile structure, but the continuous fibers are wound in a diagonal direction.

In general, when the continuous fibers are oriented in the longitudinal direction of the profile structure, the mechanical properties for the longitudinal direction are excellent, but the mechanical properties for the side portions are very weak.

The continuous fiber composite material of the present invention has an excellent effect not only in the longitudinal direction but also in the mechanical properties of the side portions of the continuous fiber composite material, since the continuous fibers are wound in the oblique direction of the hollow profile structure.

As shown in FIG. 6, in the present invention, the twist angle? Refers to the angle formed between the horizontal line of the mandrel and the line of the prepreg adjacent to the horizontal line, and the twist angle is the size and shape of the mandrel, The rotation speed of the pulling unit, and the tension of the pulling unit. For example, the twist angle may be in the range of 10 to 60 degrees. If the angle is smaller or larger than the range, the prepreg sheet may be difficult to wind on the outer circumferential surface of the mandrel.

As the pulling unit rotates, tension can be applied to the prepreg sheet, and the twist angle can be adjusted. The rotating speed of the pulling unit may be 5 to 50 m / min. In the speed range, the pulling unit imparts a tensile force of 1 to 50 N / m to the prepreg sheet, thereby easily adjusting the twist angle, To produce a continuous fiber composite material. If the tensile force is less than 1 N / m, a gap may be formed between the prepreg sheets wound in a twisted form, so that it may be difficult to produce a continuous fiber composite material having a hollow profile structure. The higher the tension, the better the physical properties and formability of the composite material, but it may be difficult to exceed the tension of 50 N / m only with the pulling unit.

The cutting portion (56)

The spirally wound prepreg sheet is cut by a cut portion in a direction perpendicular to the longitudinal direction of the mandrel and cut to a desired length to produce a continuous fiber composite material having a twisted hollow profile structure.

As described above, the apparatus for producing a continuous fiber composite material having a twisted hollow profile structure according to the present invention comprises a roller, a mandrel, a heating section, a pulling unit, and a cut section. And the rolled prepreg sheet may be pulled to produce a continuous fiber composite material 100 having a twisted hollow profile structure.

In the present invention, it is possible to produce a continuous fiber composite material having a twisted hollow profile structure which can exhibit a twist forming effect and a pulling effect of the prepreg by the rotation of the pulling unit and without a separate roving creel and a braiding device There is a feature that can be.

FIG. 8 is a flow chart showing a method for producing a continuous fiber composite material having a twisted hollow profile structure according to the present invention, and FIG. 9 is a cross-sectional view of a twisted hollow structure including a roller, mandrel, heating section, pulling unit, Fig. 1 is a configuration diagram showing an apparatus for producing a continuous fiber composite material having a profile structure; Fig.

A method of manufacturing a continuous fiber composite material having a twisted hollow profile structure according to the present invention includes a step S110 of providing a roller, a step S120 winding a prepreg sheet on the mandrel outer peripheral surface, and a step S130 cutting the mandrel do.

As described above, the continuous fiber composite material having a twisted hollow profile structure can be produced by using the apparatus for producing a continuous fiber composite material having the twisted hollow profile structure of the present invention.

First, a roller on which a prepreg sheet is wound is provided on a rotary shaft. As described above, the prepreg sheet includes continuous fibers having a unidirectional orientation.

Next, the prepreg sheet is wound on the outer peripheral surface of the mandrel to connect the prepreg sheet to the pulling unit.

Next, the sheet is pulled in a direction perpendicular to the winding direction of the prepreg sheet so that the prepreg sheet is spirally wound around the rotation axis. While the sheet is pulled by the pulling unit, the rolled prepreg sheet is heated in a heating part at 30 to 300 캜, and the heating is as described above.

As shown in FIG. 9, the rollers around which the prepreg sheet is wound are fixed. After the prepreg sheet is connected to the pulling unit, when the rotational speed is adjusted to operate the pulling unit, the prepreg sheet is wound In the vertical direction.

When the thickness of the prepreg sheet is less than 0.2 mm, the properties such as strength and hardness of the continuous fiber composite material may be deteriorated. When the thickness exceeds 20 mm, The thickness of the prepreg that is wound is increased only without improving the physical properties.

As described above, the rotational speed of the pulling unit may be 5 to 50 m / min, and in this range, the pulling unit may apply a tension of 1 to 50 N / m to the prepreg sheet .

As described above, the twist angle of the continuous fiber composite material having the twisted hollow profile structure can be adjusted to 10 to 60 degrees.

Next, the spirally wound prepreg sheet is cut to produce a continuous fiber composite material having a twisted hollow profile structure. That is, the mandrel is present in the heating space, and only the continuous fiber composite material of the twisted hollow profile structure is left without the mandrel in the pooling unit and the cutting space.

As described above, in comparison with the draw-forming apparatus including the conventional roving crill and the braiding apparatus, the present invention can reduce the additional equipment cost and increase the processing speed by using a relatively simple apparatus.

Further, since the continuous fibers are wound in the oblique direction of the hollow profile structure, the mechanical properties of the side portions of the continuous fiber composite material are complementary.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10: roving krill
20: Braiding
30: Rollers
40: Mandrel
50:
55: pulling unit
56:
60: prepreg sheet
70: continuous fiber
100: Continuous fiber composite material having a twisted hollow profile structure

Claims (12)

A roller on which a prepreg sheet is wound on a rotating shaft;
A mandrel for winding the prepreg sheet on an outer circumferential surface thereof;
A pulling unit for pulling the prepreg sheet in a vertical direction with respect to a winding direction of the prepreg sheet so that the prepreg sheet is wound spirally on the outer circumferential surface of the mandrel; And
And a cutting section for cutting the spirally wound prepreg sheet. The apparatus for manufacturing a continuous fiber composite material of the twisted hollow profile structure according to claim 1,
The method according to claim 1,
And a heating unit disposed outside the mandrel to heat the prepreg sheet wound on the outer circumferential surface of the mandrel. ≪ Desc / Clms Page number 13 >
3. The method of claim 2,
Wherein the heating unit is adjusted to 30 to 300 ° C.
The method according to claim 1,
Wherein the prepreg sheet comprises continuous fibers having an orientation in a unidirectional direction.
The method according to claim 1,
Wherein the pulling unit applies a tensile force of 1 to 50 N / m to the prepreg sheet.
The method according to claim 1,
Wherein the rotating speed of the pulling unit is 5 to 50 m / min.
(a) providing a roller on which a prepreg sheet is wound on a rotary shaft;
(b) winding the prepreg sheet on an outer circumferential surface of the mandrel to connect the prepreg sheet to a pulling unit;
(c) pulling the prepreg sheet in a direction perpendicular to the winding direction of the prepreg sheet by the pulling unit so that the prepreg sheet is wound spirally on the outer circumferential surface of the mandrel; And
(d) cutting the spirally wound prepreg sheet to produce a continuous fiber composite material having a twisted hollow profile structure. 2. The continuous fiber composite material as claimed in claim 1, Way.
8. The method of claim 7,
Wherein the prepreg sheet comprises continuous fibers having an orientation property in a unidirectional direction.
8. The method of claim 7,
Wherein the step (c) comprises heating at 30 to 300 ° C.
8. The method of claim 7,
Wherein the pulling unit imparts a tensile force of 1 to 50 N / m to the prepreg sheet in the step (c).
8. The method of claim 7,
Wherein the rotating speed of the pulling unit in the step (c) is 5 to 50 m / min.
8. The method of claim 7,
Wherein the twist angle is adjusted to 10 to 60 degrees in the step (c).

Images