KR20190050434A - Carbon fiber cutting apparatus - Google Patents

Abstract

Disclosed is a carbon fiber cutting device. The disclosed carbon fiber cutting device comprises: a first roller having a first rotating shaft and a plurality of cutting grooves formed at predetermined intervals on the outer circumferential surface thereof; a second roller having a second rotating shaft disposed in the same direction as the first rotating shaft direction, and a plurality of support rubber for supporting carbon fibers and a plurality of cutters for cutting the carbon fibers alternately coupled at predetermined intervals on the outer circumferential surface thereof; and a drive motor for providing rotational power to the first roller and second roller. As the carbon fibers transferred between the first roller and second roller are supported between the support rubber and outer circumferential surface of the first roller, the first roller and second roller rotate in the direction of engaging with each other. Therefore, the carbon fiber is cut while the cutter moves to the cutting groove.

Description

[0001] CARBON FIBER CUTTING APPARATUS [0002]

More particularly, the present invention relates to a carbon fiber cutting apparatus, in which a first roller and a second roller are engaged with each other by a gear to be rotated in an interlocking manner to thereby perform accurate cutting, And the support rubber and the cutter are formed at a second angle symmetrical with respect to the first angle with reference to the center line between the rotation axis of the first roller and the rotation axis of the second roller, To a carbon fiber cutting device for reducing the load applied to the cutter and improving the service life of the cutter.

In recent years, the automobile industry has been concentrating on the development of eco-friendly automobiles, recognizing that carbon dioxide and fuel efficiency are major issues due to the pollution caused by exhaust gas.

One thing that can not be missed in the development of environmentally friendly vehicles is to solve the problem of global warming by improving fuel efficiency and reducing CO ₂ through weight reduction. As automobiles are diversified in demand for electronicization, upgrading, and safety, the weight of automobiles is continuously increasing due to the addition of additional equipment. There is a desperate need to improve fuel efficiency through lightweighting.

Therefore, development of technology to substitute steel sheet material with composite fiber material by automobile lightweight method is actively under development.

If the weight of a car is reduced by 100kg, it can be expected to save 1.6 million liters per day and 2 million kg of greenhouse gas. The car occupies the largest portion of the car with a weight of 40%.

Since materials used in automobiles are directly connected to the safety of the driver, they must have characteristics such as high rigidity, corrosion resistance, impact resistance, internal structure, ease of component integration, and aesthetics in order to be used as lightweight materials for replacing current steel sheets.

CFRP (Carbon Fiber Reinforced Plastic) composite materials, which are widely used as lightweight materials for automobiles, have been used for sporting goods and aviation since the 1970s. For the automotive applications, Ford sedan, which was announced by Ford in 1979, have.

Since the early 2000s, CFRP composites have been actively used in automobile bodies and engines due to their high non-rigidity, non-rigidity and high damping characteristics. They have contributed greatly to automobile safety and vibration and noise reduction .

In Europe and the US, automotive applications are mainly used for structural parts and shell paneling. Typical application examples are tailgate, fender, underside panel and so on. For example, in 2013 BMW i3 By commercializing the body structure, it meets the high demand for light weight of electric vehicles.

Typical molding methods using CFRP composite materials include molding methods such as LFT (Long Fiber-Reinforced Thermoplastics), PCM (Prepreg Compression Molding), RTM (Resin Transfer Molding) and SMC (Sheet Molding Compound).

Molded parts made of PCM, RTM and SMC using thermosetting resin are suitable for use as automobile parts and building materials because of their excellent mechanical properties. .

In the case of PCM, it is possible to apply a simple shape or plate only by molding a carbon composite material laminated in one direction, and it is impossible to mold a complex shape product. In the case of RTM, a complicated molded product can be manufactured, And since the preforms are laminated in the first step and the molding is performed in the second step, they have a disadvantage that they are limited in high-speed production.

SMC is a molding method in which a mixture of fiber and resin is transferred onto a transfer film, the mixture is covered with a transfer film, the laminate sheet is heated while rolling, and the finished sheet is wound around a cylinder. It can be produced in a single process to match, so it can have the advantage of cost reduction according to annual production.

Especially, in order to produce a large quantity, high-speed production, and an object part, the mechanical property is excellent and the productivity is secured. SMC is the most suitable molding method satisfying this.

In the case of SMC products currently used for automobiles, glass fiber is used as a filler, but it is difficult to use the main body parts because it does not have high rigidity characteristics. When the filler is made of carbon fiber, the mechanical strength is excellent, Although it is suitable for use as a component, it is necessary to supplement the technology such as the development of the manufacturing method, the shortening of the molding time, and the reduction of the manufacturing cost.

The present invention particularly relates to a carbon fiber cutting apparatus for cutting carbon fibers used in a CFRP (Carbon Fiber Reinforced Plastic) composite material.

In the following Patent Document 1, a fiber inlet is formed on an upper surface of a box body to which long fibers to be cut are inserted. In addition, a fiber outlet is formed on the bottom surface to discharge cut short fibers. An outer case having a mounting wall for the outer case; A plurality of blade mounting grooves are formed along the circumference of the outer circumferential surface, and blades are provided in the respective blade mounting grooves, respectively. Rotor; A supporting roller rotatably installed on the mounting wall while being positioned adjacent to the rotor in the outer case, the supporting roller being rotatable together with the rotor while the other end of each blade provided on the rotor is rotated on the outer peripheral surface; A guide roller which is located at an upper portion between the rotor and the support roller in the outer case and is disposed so as to be adjacent to or in contact with the support roller and guides the long fiber introduced through the fiber inlet of the outer case to the contact portion between the rotor and the support roller; And a plurality of rotor-type fiber cutting devices are provided.

The conventional fiber cutting apparatus has a problem that the edge of the blade collides with the surface of the support roller while the blade cuts the fiber, thereby damaging the blade.

On the other hand, in the conventional fiber cutting apparatus, a plurality of carbon fibers are simultaneously drawn in order to improve the productivity. When cutting a plurality of carbon fibers at the same time, a large load is applied to the blade, which serves as a cause of shortening the life of the blade .

Therefore, the problem of the blade end collision with the support roller during the carbon fiber cutting operation is solved, and at the same time, the development of the carbon fiber cutting device capable of extending the life of the blade by reducing the instantaneous load applied to the blade It is urgently requested.

Korean Registered Patent No. 10-1585107 (registered on January 07, 2016)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problem of a blade being damaged by collision of an end portion of a blade during a carbon fiber cutting operation with a support roller.

SUMMARY OF THE INVENTION [0006] The present invention aims at achieving precise cutting by causing two rotating rollers to rotate together at exactly the same rotational speed.

An object of the present invention is to reduce an instantaneous load applied to a cutter and prolong the life of the cutter.

The present invention relates to an image forming apparatus including a first roller having a first rotating shaft and a plurality of cutting grooves formed on an outer circumferential surface at predetermined intervals;

A plurality of supporting rubber supporting the carbon fibers and a plurality of cutters for cutting the carbon fibers are alternately arranged on the outer circumferential surface of the first rotating shaft, A second roller; And

And a drive motor for providing rotational power to the first roller and the second roller,

The carbon fibers being transferred between the first roller and the second roller are supported between the support rubber and the outer circumferential surface of the first roller so that the first roller and the second roller are rotated in a direction in which the first roller and the second roller are engaged with each other, And the carbon fiber is cut while moving to the cutting groove.

The present invention is characterized in that the first roller and the second roller rotate in association with each other.

The present invention may further comprise: a first gear coupled to the rotational axis of the first roller; And a second gear coupled to the rotation shaft of the second roller and engaged with the first gear,

And the first and second gears are engaged with each other so that the first roller and the second roller interlock with each other and rotate at the same rotational speed.

Further, the cutting groove of the present invention is formed to be inclined at a first angle with respect to the first rotation axis,

And the support rubber and the cutter are formed at a second angle symmetrical with respect to the first angle with reference to a center line between the first rotation axis and the second rotation axis.

One end of the cutter of the present invention is inserted into a cutter groove formed on the outer surface of the second roller and is supported by an elastic member, and the other end of the cutter is protruded on the outer surface of the second roller.

The supporting rubber of the present invention may further comprise: a fixing part which is fitted in a supporting groove formed on the outer surface of the second roller; And

And a support portion exposed on the outer surface of the second roller to support the carbon fiber.

Further, hemispherical protrusions are formed on the surface of the support portion of the present invention to increase the contact area between the first roller and the support portion when supporting the carbon fiber.

The carbon fiber cutting apparatus according to the present invention has the effect of preventing the cutter from being damaged by the collision with the support roller during the carbon fiber cutting operation.

According to the carbon fiber cutting apparatus of the present invention, the two rollers are rotated at the same rotation speed in an interlocking manner, thereby achieving accurate cutting.

According to the carbon fiber cutting apparatus of the present invention, the instantaneous load applied to the cutter is reduced, thereby extending the service life of the cutter.

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

1 is a plan view of a carbon fiber cutting apparatus according to a preferred embodiment of the present invention.
2 is a front view of a carbon fiber cutting apparatus according to a preferred embodiment of the present invention,
3 is a plan view of a cutter and a cutting groove of a carbon fiber cutting apparatus according to a preferred embodiment of the present invention,
4 is a view illustrating an example in which a cutter of a carbon fiber cutting apparatus according to a preferred embodiment of the present invention is engaged with a cutting groove,
FIG. 5 is a longitudinal sectional view of a cut-away portion of a cutter of a carbon fiber cutting apparatus according to a preferred embodiment of the present invention; FIG.
FIG. 6 is a longitudinal sectional view showing a cut-away portion of a carbon fiber cutting apparatus according to a preferred embodiment of the present invention when the cutting groove is engaged with the cutter.
7A to 7C are front views of a carbon fiber cutting process of a carbon fiber cutting apparatus according to a preferred embodiment of the present invention.
8 is a view for explaining a situation in which fine grooves are filled by pressing hemispherical protrusions.

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings. It should be understood, however, that the techniques described herein are not intended to be limited to any particular embodiment, but rather include various modifications, equivalents, and / or alternatives of the embodiments of this document. In connection with the description of the drawings, like reference numerals may be used for similar components.

Also, the terms "first," "second," and the like used in the present document can be used to denote various components in any order and / or importance, and to distinguish one component from another But is not limited to those components. For example, 'first part' and 'second part' may represent different parts, regardless of order or importance. For example, without departing from the scope of the rights described in this document, the first component may be named as the second component, and similarly the second component may be named as the first component.

It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the other embodiments. The singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art. The general predefined terms used in this document may be interpreted in the same or similar sense as the contextual meanings of the related art and, unless expressly defined in this document, include ideally or excessively formal meanings . In some cases, even the terms defined in this document can not be construed as excluding the embodiments of this document.

FIG. 1 is a plan view of a main portion of a carbon fiber cutting apparatus 10 according to a preferred embodiment of the present invention, and FIG. 2 is a front view of a main portion of a carbon fiber cutting apparatus 10 according to the present preferred embodiment.

Will be described with reference to Figs. 1 and 2. Fig.

A carbon fiber cutting apparatus 10 according to a preferred embodiment of the present invention includes a first roller 100, a second roller 200, and a frame 600.

The first roller 100 and the second roller 200 are horizontally arranged on the upper part of the frame 600.

The first roller 100 and the second roller 200 are respectively provided with a first rotating shaft 100a and a second rotating shaft 200a and the first rotating shaft 100a and the second rotating shaft 200a are disposed in the same direction do.

The drive motor 300 provides rotational power to the first roller 100 and the second roller 200.

In the conventional carbon fiber cutting apparatus 10, one driving motor 300 is coupled to one roller, and the rotational speeds of the two engaging rollers do not exactly coincide with each other so that accurate cutting is not performed.

Accordingly, in the present invention, one drive motor 300 drives the first roller 100 and the second roller 200, and the first roller 100 and the second roller 200 are rotated in association with each other . This ensures accurate cutting.

The first gear 100b is engaged with the rotation shaft of the first roller 100. [

The second gear 200b is engaged with the rotation shaft of the second roller 200 and the first gear 100b is engaged with the second gear 200b.

The driving motor 300 is coupled to the rotating shaft of the second roller 200 to rotate the second roller 200 and the first roller 100 engaged with the second roller 200 rotates the second roller 200 And rotates in conjunction with rotation. Thus, the first roller 100 and the second roller 200 are engaged at the same speed at the same position, so that accurate cutting is always possible.

The first roller 100 and the second roller 200 are rotated in a direction in which they are engaged with each other by the drive motor 300.

That is, the first roller on the left side is rotated in the clockwise direction and the second roller 200 on the right side is rotated in the counterclockwise direction.

3 is a plan view of a cutter 500 and a cutting groove 110 of a carbon fiber cutting apparatus 10 according to a preferred embodiment of the present invention. FIG. 4 is a plan view of a carbon fiber cutting apparatus 10 according to a preferred embodiment of the present invention. 10 of the cutter 500 and the cutting groove 110,

5 is a vertical cross-sectional view of a cutter 500 of a carbon fiber cutting apparatus 10 according to a preferred embodiment of the present invention, and Fig. 6 is a cross-sectional view of a cutter 500 of a carbon fiber cutting apparatus 10 according to a preferred embodiment of the present invention. Is a longitudinal sectional view of the concave portion when the cutting groove (500) and the cutting groove (110) are engaged,

7A to 7C are front views showing a process of cutting a carbon fiber (CF) of a carbon fiber cutting device 10 according to a preferred embodiment of the present invention.

Will be described with reference to Figs. 3 to 7. Fig.

The cutting groove 110 provides a space into which the cutter 500 is inserted when cutting the carbon fiber CF, and a plurality of the cut grooves 110 are formed on the outer circumferential surface of the first roller 100 at predetermined intervals.

There has been a problem that the end portion of the cutter 500 collides with the outer peripheral surface of the support roller during cutting to damage the cutter 500.

Accordingly, in the present invention, the cutting groove 110 is formed in the first roller 100 on which the carbon fiber CF is supported, thereby solving this problem.

The supporting rubber 400 serves to support the carbon fibers CF to be cut on the outer circumferential surface of the first roller 100.

The supporting rubber 400 and the cutter 500 are alternately arranged on the outer circumferential surface of the second roller 200 at predetermined intervals.

The coupling structure of the supporting rubber 400 will be described.

The supporting rubber 400 includes a fixing portion 400a and a supporting portion 400b.

The fixing portion 400a is fitted in the support groove 210 formed on the outer circumferential surface of the second roller 200 and the support portion 400b is exposed on the outer circumferential surface of the second roller 200 to support the carbon fiber CF .

The supporting rubber 400 causes the carbon fibers CF to be supported on the outer circumferential surface of the first roller 100 as the first roller 100 and the second roller 200 rotate during the cutting of the carbon fiber CF.

The coupling structure of the cutter 500 will be described.

One end of the cutter 500 is inserted into the cutter groove 220 formed on the outer circumferential surface of the second roller 200. At this time, the elastic member 510 supports the cutter 500 inserted into the cutter groove 220.

The elastic member 510 is preferably a spring.

The other end of the cutter 500 protrudes on the outer circumferential surface of the second roller 200 and moves to the cutting groove 110 while pushing the carbon fiber CF at the time of cutting.

A plurality of carbon fibers CF are simultaneously conveyed between the first roller 100 and the second roller 200 of the cutting device to improve the productivity.

In order to cut a plurality of carbon fibers CF, the length of the roller in the direction of the rotation axis can be appropriately long.

Conventionally, a plurality of carbon fibers CF transferred to a pair of rollers are cut at the same time, so that a momentary load imposed on the cutter 500 is large, shortening the service life of the cutter 500 and imposing a burden on the operation of the drive motor 300 .

In the present invention, the cutting groove 110 is formed to be inclined at a first angle with respect to the first rotation axis 100a, and the support rubber 400 and the cutter 500 are formed so as to be inclined with respect to the first rotation axis 100a and the second rotation axis 100a, And a second angle symmetrical with respect to the first angle with respect to a center line between the rotating shafts 200a.

As a result, the carbon fibers CF transferred between the first roller 100 and the second roller 200 are sequentially cut. As a result, the load on the cutter 500 and the drive motor 300 is reduced, thereby improving durability.

The carbon fiber cutting device 10 according to the present invention having such a structure is configured such that a carbon fiber CF transferred between the first roller 100 and the second roller 200 is transferred to the support rubber 400, The cutter 500 moves to the cutting groove 110 as the first roller 100 and the second roller 200 are rotated in the direction in which the first roller 100 and the second roller 200 are engaged with each other while being supported between the outer circumferential surface of the cutter 100, (CF) is cut.

7A shows a state in which the supporting rubber 400 of the second roller 200 located above the cutter 500 supports the carbon fiber CF on the outer peripheral surface of the first roller 100 And the cutter 500 is an enlarged view showing a state in which the carbon fiber CF is not cut yet.

7B shows that the supporting rubber 400 of the second roller 200 located above and below the cutter 500 supports the carbon fibers CF on the outer circumferential surface of the first roller 100, In a state in which the cutting is performed. In this state, the carbon fiber CF is pulled tightly with the tensile force. The carbon fiber CF is moved in a direction in which the cutter 500 is inserted into the cutting groove 110 (110) as the first roller 100 and the second roller 200 are rotated To cut the carbon fibers CF.

Fig. 7 (c) is a view showing the state after the carbon fiber CF is cut.

In order to accurately cut the carbon fiber CF to a predetermined length on the design, the carbon fiber CF must be stably supported on the outer circumferential surface of the first roller 100 at the time of cutting. That is, no slip must occur between the supporting rubber 400 and the outer circumferential surface of the first roller 100.

Therefore, it is important to increase the adhesion between the support rubber 400 and the outer peripheral surface of the first roller 100.

Accordingly, in the present invention, the surface shape of the supporting rubber 400 is formed as hemispherical protrusions. In the case where the supporting rubber 400 is formed as a flat surface, the fine grooves generated due to processing defects or the like on the surface can lower the supporting force between the supporting rubber 400 and the outer peripheral surface of the roller.

However, the hemispherical protrusion formed on the surface of the supporting rubber 400 is pressed on the outer circumferential surface of the first roller 100, and the side wall around the fine groove carries the fine grooves, thereby increasing the adhesion.

8 is a view for explaining a situation in which fine grooves are filled by pressing hemispherical protrusions.

Fig. 8 (a) is a view for explaining a state before the hemispherical protrusion is squeezed, and Fig. 8 (b) is a view for explaining a state in which the hemispherical protrusion is pressed and the fine groove is squeezed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Carbon fiber cutting device 10
First roller 100 First rotation shaft 100a
The first gear 100b cutting groove 110
Second roller 200 The second rotation shaft 200a
The second gear 200b support groove 210
Cutter groove 220
Drive motor 300
Supporting rubber 400 fixing portion 400a
The support portion 400b
Cutter 500 Elastic member 510
Frame 600
Carbon fiber CF

Claims (7)

A first roller 100 having a first rotating shaft 100a and a plurality of cutting grooves 110 formed on the outer circumferential surface at predetermined intervals;
A plurality of support rubbers 400 for supporting the carbon fibers CF and a plurality of support ribs 400 for cutting the carbon fibers CF are provided on the second rotation shaft 200a arranged in the same direction as the direction of the first rotation shaft 100a. A second roller 200 which is alternated with the cutter 500 on the outer circumferential surface and joined at predetermined intervals; And
And a drive motor (300) for providing rotational power to the first roller (100) and the second roller (200)
A carbon fiber CF transferred between the first roller 100 and the second roller 200 is supported between the support rubber 400 and the outer circumferential surface of the first roller 100, And the second roller 200 are rotated in the direction in which they are engaged with each other, the cutter 500 is moved into the cutting groove 110 to cut the carbon fiber CF. The method according to claim 1,
Wherein the first roller (100) and the second roller (200) rotate in association with each other. 3. The method of claim 2,
A first gear 100b coupled to a rotational axis of the first roller 100; And
And a second gear (200b) coupled to a rotating shaft of the second roller (200) and engaged with the first gear (100b)
The first roller 100 and the second roller 200 interlock with each other and rotate at the same rotational speed by coupling the first gear 100b and the second gear 200b. The method according to claim 1,
The cutting groove 110 is formed to be inclined at a first angle with respect to the first rotation shaft 100a,
The support rubber 400 and the cutter 500 are formed at a second angle symmetrical with respect to the first angle with reference to a center line between the first rotation axis 100a and the second rotation axis 200a , A carbon fiber cutting device. The method according to claim 1,
One end of the cutter 500 is inserted into a cutter groove 220 formed on an outer circumferential surface of the second roller 200 and is supported by an elastic member 510. The other end of the cutter 500 is connected to the second roller 200) projecting on the outer circumferential surface. The method according to claim 1,
The supporting rubber (400)
A fixing portion 400a fitted in the support groove 210 formed on the outer circumferential surface of the second roller 200; And
And a support portion (400b) exposed on an outer peripheral surface of the second roller (200) to support the carbon fiber (CF). The method according to claim 6,
Wherein a hemispherical protrusion is formed on a surface of the support portion 400b to increase a contact area between the first roller 100 and the support portion 400b when the carbon fiber CF is supported, Cutting device.

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