JP3335666B2 - End face cutting method of carbon fiber reinforced plastic laminate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a fiber reinforced plastic laminate, and more particularly to a method for cutting an end face thereof.

[0002]

2. Description of the Related Art CFRP (carbon fiber reinforced plastic)
Fiber-reinforced plastic-based composite materials are highly lightweight and have high strength and rigidity, and are widely used as structural members for aircraft and the like. The composite material product is formed with a margin at the outer peripheral portion during the manufacture thereof in order to ensure quality. Therefore, a step of removing the excess is essential at the stage of commercialization.

[0003] Conventionally, as a tool for removing excess material, there is known an end mill in which a diamond sintered body having a semicircular cross section is joined to the tip end as described in Japanese Utility Model Application Laid-Open No. 63-47818. As a method of removing excess material, a method described in Japanese Patent Publication No. 59-27287, in which a work is sandwiched from above and below by a trimming jig and then cut with a router, and described in Japanese Utility Model Laid-Open No. 2-82461. There is known one that grinds a work using an end mill in which abrasive grains are electrodeposited on the tip.

[0004]

By the way, the above-mentioned conventional tools for removing excess thickness and methods for removing excess thickness have the following disadvantages.

[0005] For example, when a CFRP laminate is cut by an end mill joined with a diamond sintered body, fibers are liable to peel off from the surface layer of the laminate, causing a decrease in strength and a fatigue failure.

Further, when the work is sandwiched from above and below by a trimming jig, a special jig corresponding to the shape of the work is required. Therefore, when the shape of the product is complicated, it takes a lot of man-hours to manufacture the corresponding jig, and it is difficult to sandwich the work with a uniform force over the entire circumference. In this case, peeling of the fiber still occurs.

On the other hand, in the case of using an end mill in which abrasive grains are electrodeposited at the tip, a smooth surface such as cutting cannot be obtained, and it is necessary to perform finishing.

Accordingly, an object of the present invention is to provide a method for cutting an end face of a carbon fiber reinforced plastic laminate which eliminates the above-mentioned problems of the prior art and does not require a trimming jig and does not cause fiber separation. It is in.

[0009]

[Means for Solving the Problems] In order to solve the above-mentioned purpose
The method according to claim 1 is a method of cutting an end face of a carbon fiber reinforced plastic laminate, wherein the surface layers on both sides of the laminate are oriented in the same direction as the carbon tape.
Along with laminating the repreg material , a glass fiber fabric is adhered to the outside of the surface layers on both sides and heat-cured, and the rake face of the blade is cut using a cutter having a blade having no twist angle. The end face of the laminated plate is cut while making an angle of 90 to 180 degrees with respect to the fiber direction.

[0010]

According to the present invention, a carbon fiber for forming a surface layer is provided.
The cutter blade acts on the fibers of the prepreg material in the shearing direction. Therefore, the cutting resistance is reduced, the cutting is easily performed, and the peeling of the carbon tape prepreg material is prevented. Also, carbon tape generated at the cutting edge of the cutter
Tearing between fibers of the prepreg material is suppressed by the glass fiber fabric.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for cutting a fiber reinforced plastic laminate according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a rectangular CFRP laminate (hereinafter, simply referred to as a laminate), and a carbon tape prepreg (hereinafter, abbreviated as a prepreg), which is a plate material of fiber reinforced plastic, is provided on upper and lower surface layers. 2 are laminated in a vertically symmetrical manner. Further, a glass fiber fabric 3 is adhered to the surface of the prepreg material 2 and then heated and cured. The direction d in which the fibers of the prepreg material 2 run forms an angle of about 45 degrees with both the end face 1a and the end face 1b of the laminate 1.

On the other hand, as shown in FIGS.
In the figure, a cutting edge tip 6 of a diamond sintered body is attached to a tip of a shank 5 at an interval of 180 degrees. The rake face 6a of the cutting tip 6 forms an angle of 90 degrees with its tangent (indicated by 1 in FIG. 3), and the cutter 4 rotates clockwise to perform cutting on the workpiece. ing.

As shown in FIGS. 4 and 5, when cutting the laminated plate 1, the cutter 4 rotating clockwise is brought into contact with the end face 1a, and at the same time, the cutter 7 rotating counterclockwise is brought into contact with the end face 1b. And make cutting while moving both to the front side. Note that the cutter 7 has a symmetrical shape with respect to the cutter 4,
The workpiece is cut by rotating it counterclockwise.

In the present embodiment, the angles α and β between the rake face 6a of the cutting edge tip 6 and the fiber direction d of the prepreg material 2 at the end faces 1a and 1b are determined at the end of cutting (cut in FIG. 5). The blade tip 6 is indicated by a two-dot chain line).
35 degrees. Therefore, as shown in FIG. 6, a shearing force acts on the carbon fibers of the prepreg material 2 instead of a tensile force. As is well known, carbon fibers have very high tensile strength, but relatively low shear strength. Therefore, the resistance to the above-mentioned shearing force is small, and the individual fibers are broken without the prepreg material 2 being lifted off the laminate 1 and peeling off.

FIGS. 7 and 8 show that the fiber direction d is one end face 1.
An example in which the laminated board 2 that is 30 degrees with respect to a is cut will be described.

Incisor tip 6 at end faces 1a and 1b
The angles α and β between the rake face 6a and the fiber direction d of the prepreg material 2 are determined at the end of cutting (FIG. 8) in this embodiment.
The cutting edge tip 6 is shown by a two-dot chain line).
0 degrees and about 150 degrees.

Therefore, as shown in FIG. 9, not the tensile force but the shearing force acts on the carbon fibers of the prepreg material 2, and the same effect as that of the embodiment shown in FIG. 4 is exerted.

Here, in order for the shearing force, not the tensile force, to act on the carbon fiber, considering the component force parallel to the fiber direction of the cutting force, the angle between the rake face and the fiber direction is 90 degrees or more.
It is known that the angle may be in the range of 180 degrees. In this embodiment, the torsion angle of the cutting edge tip 6 of the cutter 4 is set to 0 degree so that no force acts in the thickness direction of the laminated plate 1.

As shown in FIGS. 6 and 9, tears 8 occur between the carbon fibers of the prepreg material 2 during cutting, but the prepreg material 2
Is prevented by the glass fiber fabric 3 attached to the surface. In addition, as a method of preventing peeling due to the tear 8, the same effect can be obtained by using an epoxy resin layer or the like instead of the glass fiber fabric 3, but the glass fiber fabric 3 is easily pasted or cut. In addition, since the fabric is a woven fabric, it does not easily progress even if peeling occurs, and further has such features as preventing peeling even at the time of perforation.

FIG. 10 shows the rake face 6 a of the cutting edge tip 6.
A comparative example is shown in which the angle α formed between the carbon fiber and the fiber direction of the carbon fiber is 45 degrees. In this case, the carbon fiber is broken by the tensile force. As described above, since the carbon fiber has a very high tensile strength, the resistance to the tensile force is large, and as shown in FIG. 11, the prepreg material 2 floats up from the laminate 1 and peels off. Considering the component force of the cutting force parallel to the fiber direction, it is known that the tensile force acts on the carbon fiber when the angle between the rake face and the fiber direction is 0 to 90 degrees.

Although the description of the concrete embodiment has been completed above, embodiments of the present invention are not limited to this embodiment. For example,
In the above embodiment, two end faces of the laminated plate are cut at the same time, but one end face may be cut at a time. Further, the surface layer of the laminate may be formed of a fiber-reinforced plastic plate material other than CFRP.

[0023]

As is apparent from the above description, the present invention
In the above, the surface layers on both sides of the laminate have the same fiber direction.
Quickly and laminate the carbon tape prepreg material
Then, a glass fiber fabric is attached to the outside of the surface layers on both sides.
With a blade that is hardened by heating and has no twist angle
The rake face of the blade is opposed to the fiber direction of the surface layer using
And make an angle of 90-180 degrees
Since the end face of the laminated plate is cut, the end face is easily cut to prevent peeling of the carbon tape prepreg material , while the carbon tape pulp formed at the cutting edge of the cutter is prevented.
Tearing between the fibers of the repreg material is suppressed by the glass fiber fabric, and an effect is achieved in that good trimming can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a CFRP laminate according to one embodiment of the present invention.

FIG. 2 is a side view showing a cutter according to one embodiment of the present invention.

FIG. 3 is a front view showing a cutter according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a state where an end face of a laminated plate is cut by a cutter.

FIG. 5 is a plan view showing a state where the end face of the laminated plate is cut by a cutter.

FIG. 6 is an enlarged view of a portion A in FIG. 5;

FIG. 7 is a perspective view showing a state where the end face of the laminated plate is cut by a cutter.

FIG. 8 is a plan view showing a state where the end face of the laminated plate is cut by a cutter.

FIG. 9 is an enlarged view of a portion B in FIG. 8;

FIG. 10 is an enlarged view showing a comparative example in which the angle between the rake face of the cutting edge tip and the fiber direction of the carbon fiber is 45 degrees.

FIG. 11 is a cross-sectional view taken along the line CC in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CFRP laminated board 2 Carbon tape prepreg material 3 Glass fiber fabric 4,7 Cutter 6 Cutting edge chip 6a Rake face 8 Tear

Claims (1)

(57) [Claims] 1. A method of cutting an end face of a carbon fiber reinforced plastic laminate, wherein the surface layers on both sides of the laminate have the same fiber direction, and
While laminating a bon tape prepreg material, attaching a glass fiber woven fabric to the outside of the surface layers on both sides and heating and curing, and using a cutter provided with a blade having no twist angle, the rake face of the blade has the above-mentioned surface. 90 degrees to 1 with respect to the fiber direction of the layer
A method for cutting an end face of a carbon fiber reinforced plastic laminate, wherein the end face of the laminate is cut while forming an angle of 80 degrees.