JP3517175B2 - Aluminum foil cutting tool and optical fiber cutting tool - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade used for cutting an aluminum foil used for an aluminum electrolytic capacitor and cutting an optical fiber.

[0002]

2. Description of the Related Art For example, the surface of an aluminum foil used for an aluminum electrolytic capacitor is electrolytically treated to increase its surface area due to the characteristics of the capacitor, and its surface layer is made of alumina. Since it is difficult to cut, high-speed steel and cemented carbide have been used as materials for blades for cutting this. The aluminum foil, which is the object to be cut, is a piece of cloth having a width of about 500 mm and a thickness of 0.1 to 0.2 mm, and the cutting in the longitudinal direction is as shown in FIGS.
The aluminum foil 3 is sandwiched between the slitter upper blade 1 and the slitter lower blade 2.

The slitter upper blade 1 and the slitter lower blade 2 are
Set a plurality of each on the same axis, while winding the cut piece of aluminum foil 3 in the form of a slitter,
The shafts provided with the slitter lower blades 2 are relatively rotated in opposite directions for cutting. The slitter upper blade 1 and the slitter lower blade 2 are made of high speed steel or cemented carbide.

Further, for example, as shown in FIG. 4, the blade 4 for cutting the optical fiber 5 has a donut disk shape. Figure 4
As shown in FIG. 5, a cutting edge portion 4a and a pair of inclined circumferential surfaces 4b on both sides of the cutting edge portion 4a are formed on the outer peripheral portion thereof. When the optical fiber 5 is cut, the blade 4 is not rotated but is applied to the optical fiber 5 to make a cut, and the cut optical fiber 5 is cut by pulling or folding, so-called broaching, so that the optical fiber 5 is cut into fixed lengths. Therefore, it is also known that the cutting edge portion 4a of the cutting tool 4 requires a minute chip width b of 1 to 4 μm in width, as shown in FIG.

As for the cutting tool 4 used in this processing step, a metal such as stainless steel, or a general cemented carbide, etc., is adopted as in the above-mentioned cutting tool for cutting aluminum foil (Japanese Patent Laid-Open No. 6-155373). See the bulletin).

[0006]

However, when high speed steel or cemented carbide is used as the material of the blade used for cutting the above-mentioned aluminum foil or optical fiber, there is a problem that wear resistance is poor and life is short. .

For example, when the life of aluminum foil is represented by the processing amount, it is about 4 to 6 tons for high speed steel and about 5 for cemented carbide.
Although it corresponds to 10 tons, 50 tons from the viewpoint of productivity.
There is a demand for usable materials. Further, there is a problem that the aluminum foil shavings at the time of cutting are at a high temperature and adhere to the inside of the cutting tool, resulting in poor cutting performance.

Further, as described above, the blade 4 for cutting an optical fiber requires a blade tip portion 4a having a minute crack width b at the tip of the blade 4, but metal such as stainless steel or a general super 2000 for blade 4 made of hard alloy
If you try to grind the cutting edge part 4a using a # 2 diamond grindstone, cracks tend to occur in that part, and the size of the chip width b will vary, so further grinding with a diamond grindstone finer than 2000 Must be
There was a problem that productivity deteriorated.

[0009]

Therefore, according to the present invention, a plurality of slitter upper blades and a plurality of slitter lower blades are coaxially set, and an aluminum foil is sandwiched between the slitter upper blades and the slitter lower blades so that each shaft is An aluminum foil cutting blade which is relatively rotated in the opposite direction to be cut and wound up, wherein the slitter upper blade and the slitter lower blade are made of a material having an average crystal grain diameter of 0.5 μm of tungsten carbide as a main component. hereinafter, fracture toughness consists 23MNm ^-3/2 or more ultrafine cemented carbide, characterized in that the surface roughness of the cutting edge near the center line average roughness and (Ra) 1 [mu] m or less. Further, the present invention has a donut disk shape, and has a width 1 to
A blade for cutting an optical fiber, in which a cutting edge portion having a minute chip width of 4 μm and a pair of inclined peripheral surfaces on both sides thereof are formed, respectively, and a cut is made by hitting the optical fiber,
Tungsten carbide, which is a main component of the blade, has an average crystal grain size of 0.5 μm or less and a fracture toughness of 23 MN.
It is characterized in that it is made of ultrafine particle cemented carbide of m ^−3/2 or more, and the surface roughness of the inclined surface is set to a center line average roughness (Ra) of 1 μm or less.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below.

The blade using the ultrafine particle cemented carbide of the present invention is used, for example, for cutting an aluminum electrolytic capacitor as follows.

As shown in FIG. 3, the aluminum foil 3, which is an object to be cut, has a width of about 500 mm and a thickness of 0.1 to 0.2 mm, and is cut in the longitudinal direction. Specifically, FIG.
As shown in FIG. 3, a plurality of slitter upper blades 1 and a plurality of slitter lower blades 2 are coaxially set, and as shown in FIG. 2, the gap a between the slitter upper blades 1 and the slitter lower blades 2 is about 0. A method of sandwiching the aluminum foil 3 in a state of 3 to 0.5 mm, further rotating and rotating each axis in opposite directions, and cutting and winding.

Due to the characteristics of the capacitor, the aluminum foil 3 has
The surface of the blade has been electrolyzed to increase the surface area and has become alumina, which is extremely hard and difficult to cut. Therefore, the blade material must have high hardness and excellent wear resistance. Therefore, in the present invention, as the material of the slitter upper blade 1 and the slitter lower blade 2, the average crystal grain diameter of the main component tungsten carbide (WC) is 0.5 μ.
m or less, the fracture toughness K _IC uses 23MNm ^-3/2 or more ultrafine cemented carbide.

[0014] Here, the reason why the fracture toughness K _IC is a 23MNm ^-3/2 or more, slitter upper blade 1 when the aluminum foil 3 cleavage
This is because the toughness is curved, and stronger toughness is required. In order to increase the toughness of ultrafine grained cemented carbide,
A method of increasing the Co content is used, which increases the flexural strength but decreases the hardness.

Therefore, in the present invention, the above-described fracture toughness is provided by setting the average crystal grain size of the main component tungsten carbide to 0.5 μm or less. Also,
As described above, by using the ultrafine particle cemented carbide, the finishing process is facilitated, and the surface roughness in the vicinity of the cutting edge is easily adjusted to 1 μm or less in terms of the center line average roughness (Ra).

By setting the surface roughness in the vicinity of the cutting edge to be 1 μm or less in terms of center line average roughness (Ra), the adhesion of chips of the aluminum foil 3 which has become high in temperature during cutting is reduced,
The life of 50 tons or more can be obtained by converting the processing amount of the aluminum foil 3.

Next, another embodiment of the present invention will be described.

The blade 4 for cutting the optical fiber is
As shown in FIG. 4, it is in the shape of a donut disk, and as shown in FIG. 5, a cutting edge portion 4a and a pair of inclined peripheral surfaces 4b on both sides thereof are formed on the outer peripheral portion thereof, and when cutting an optical fiber, Optical fiber 5 without rotating this blade 4.
Make a notch on it and pull or fold it to cut. As shown in FIG. 5, the blade edge portion 4a at the tip of the blade 4 has a width of 1 to 4 μm for making a cut easily.
A minute chip width b of m is provided.

Since the optical fiber is very hard, the blade 4 must be made of a material having high hardness and excellent wear resistance as in the above embodiment. Therefore, the main component is tungsten carbide (WC). Average crystal grain size is 0.5
μm or less, the fracture toughness K _IC uses 23MNm ^-3/2 or more ultrafine cemented carbide.

[0020] Here, the reason why the fracture toughness K _IC is a 23MNm ^-3/2 or more, when an incision into the optical fiber 5, a force is applied through a hole bored in a central portion of the blade 4, and more This is because strong toughness is required. In addition, in order to increase the toughness of the ultrafine particle cemented carbide, a method of increasing the Co content is used, which increases the bending strength but decreases the hardness.

Therefore, in the present invention, the above-mentioned fracture toughness is provided by setting the average crystal grain size of the main component tungsten carbide to 0.5 μm or less. Also,
By using the ultrafine particle cemented carbide, the inclined peripheral surface 4b can be easily finished, and the surface roughness can be easily set to 1 μm or less in terms of the center line average roughness (Ra). Therefore, even if it is ground with a rough diamond grindstone, cracks are less likely to form in the blade tip portion 4a of the blade 4, so that productivity is improved.

The ultrafine-grain cemented carbide of the present invention is made of tungsten carbide (W having an average crystal grain size of 0.5 μm or less).
C) 80 to 90% by weight, Co 9 to 19% by weight,
Those containing 1 to 3% by weight of other components such as TaC are preferable. This is because the fracture toughness is improved by increasing the Co content. The feared decrease in hardness can be suppressed by making the particle size smaller.

Next, a method of manufacturing a cutting tool using the ultrafine particle cemented carbide of the present invention will be described below.

First, 80 to 90% by weight of WC having an average particle size of 0.2 to 0.5 μm, 9 to 19% by weight of Co, and 1 to 3% by weight of other components are used in a ball mill for about 10 to 15%.
Mix and crush for hours. The dried raw material was molded into a predetermined shape with a press machine, and then the material sintered at 1350 to 1550 ° C. was further heated to 1300 to 1400 ° C. and 450 to 5 ° C.
HIP treatment (hot isostatic pressing: Hot Isostatic Pressi) for 18 to 22 hours under the condition of 50 atmospheric pressure
ng) to crush the void. Knives with ultrafine cemented carbide thus obtained has an average crystal grain size of the WC in the sintered body 0.5μm or less, the fracture toughness 23MNm ^-3/2 or more, in Hv hardness 14.5GPa more It is possible to obtain a blade having excellent wear resistance.

The thus-obtained sintered body is used after being subjected to a finishing process in the vicinity of the cutting edge so as to meet the above-mentioned use.

For example, in the case of a blade for cutting aluminum foil, the surface roughness in the vicinity of the cutting edge is the center line average roughness (Ra) of 1 μm.
By setting it to be m or less, the amount of chips of the aluminum foil that adheres at the time of cutting can be reduced, and the productivity is improved.

Further, in the case of the cutting edge 4 for cutting the optical fiber 5, when the inclined peripheral surface 4b is finished, it is finer because the WC average crystal grain diameter in the sintered body is 0.5 μm or less. Even if a diamond grindstone is not used, cracks are unlikely to occur in that portion, and the size of the cutting edge portion 4a and the chip width b can be made constant, and the process can be shortened. .

[0028]

[0029]

EXAMPLES Examples of the present invention will be described below. (Example 1) As an example of the present invention, an average particle diameter of 0.2 to
WC 83% of 0.5 μm, Co 15% and other components such as TaC of about 2% are mixed and pulverized in a ball mill for about 10 hours, and the dried raw material is molded by a press machine, and then 1350.
The material sintered at ˜1550 ° C.
HIP treatment for 20 hours at 500 ° C. and 500 ° C. (hot isostatic pressing: Hot Isostatic Pressi
ng), and as shown in sample D of Table 1, a sintered body having an average crystal grain diameter of 0.5 μm or less was obtained. The sintered body thus obtained was processed into a predetermined shape to obtain a slitter blade for an aluminum electrolytic capacitor. Further, finishing processing was performed so that the surface roughness in the vicinity of the cutting edge was set to a center line average roughness (Ra) of 1 μm or less.

As a comparative example, the average particle size is 0.8 μm.
m WC 89.5%, Co 9.5% and other metal components such as TaC about 1% are mixed and pulverized by a ball mill for about 10 to 15 hours, and the dried raw material is molded by a press machine, and then at 1350 to 1550 ° C. 1300 to 1 for the sintered material
HIP treatment (hot isostatic pressing method: Hot Isosta for 18 to 22 hours at 400 ° C. and 450 to 550 atm)
TIC Pressing) to obtain a sintered body having an average crystal grain size of about 0.8 μm (Sample C in Table 1).

This was used as a slitter upper blade 1 for cutting an aluminum foil 3 for an aluminum electrolytic capacitor. In order to evaluate the difference in life depending on the material, high speed steel and general cemented carbide were also tested. All the lower slitter blades 2 were made of general cemented carbide and evaluated.

As a result, as shown in Table 1, the slitter upper blade (sample D) of the embodiment of the present invention using the ultrafine particle cemented carbide has a higher wear resistance than the high speed steel of the same shape and the cemented carbide. Is high,
There was little adhesion of aluminum foil, which was hot at the time of cutting.

[0033] The average crystal grain size as large as 0.8 [mu] m, the sample C fracture toughness is low comparative example 13MNm ^-3/2 is an unsuitable as cutlery for aluminum foil cutting low wear resistance It was

That is, the average crystal grain size is 0.2 to 0.5.
μm, fracture toughness of 23 to 26 MNm ^-3/2Of sample D
Extremely high wear resistance due to the use of ultrafine cemented carbide
The aluminum foil adhesion is extremely high and causes problems in the process.
I was able to make it an endless blade.

In the above examples, the fracture toughness is determined by the IF method (Indentation Fracture).
Method). This is calculated from the length of the crack propagated when an external force is applied to the test piece.

The average crystal grain size was determined by the cutting method of JIS H0501 using a metallographic photograph or an enlarged photograph of an electron microscope after the surface of the sintered body was mirror-finished.

[0037]

[Table 1]

(Example 2) Similarly, as an example of the present invention, WC83% having an average particle diameter of 0.2 to 0.5 μm and C
o About 15% and about 2% of other ingredients are about 1 in a ball mill.
Mixing and crushing for 0 hours, molding the dried raw material with a press machine,
Then, the material sintered at 1350 to 1550 ° C.
HIP treatment for 20 hours under conditions of 0 to 1400 ° C. and 500 atm (hot isostatic pressing method: Hot Isostatic
The voids were crushed by pressing and processed into a predetermined shape as a cutting blade for an optical fiber (Sample D in Table 1). At this time, the inclined peripheral surface forming the V-shape has 100
Finishing processing was performed using a No. 0 diamond grindstone to obtain a center line average roughness (Ra) of 1 μm or less.

As a comparative example, the average particle diameter is 0.8 μm.
m WC 89.5%, Co 9.5%, and other components such as TaC about 1% are mixed and pulverized by a ball mill for about 10 to 15 hours, and the dried raw material is molded by a press machine, and then 13
The material sintered at 50 to 1550 ° C. is
HI for 18-22 hours at 0 ° C and 450-550 atmospheres
P treatment (hot isostatic pressing method: Hot Isostati
A blade for cutting an optical fiber was produced from the sintered body obtained by c Pressing) (Sample C in Table 1).

In order to evaluate the difference in life depending on the material, high speed steel and general cemented carbide were also manufactured and evaluated.
As shown in (1), the blade for optical fiber cutting of the present invention using the ultrafine particle cemented carbide (Sample D) had higher wear resistance than the high speed steel and cemented carbide of the same shape.

[0041] The average crystal grain size as large as 0.8 [mu] m, fracture toughness sample C is lower comparative example 13MNm ^-3/2, abrasion resistance was unsuitable as a tool for optical fibers cut low .

That is, the average crystal grain size is 0.2 to 0.5.
μm, fracture toughness of 23 to 26 MNm ^-3/2Light material
Abrasion resistance due to application to fiber cutting blades
Is very high, cracks do not occur on the ground surface, and chips
It is possible to use a blade with very small variation in size.
It was

In the above examples, the fracture toughness was determined by the IF method (Indentation Fracture).
Method). This is calculated from the length of the crack propagated when an external force is applied to the test piece.

The average crystal grain size was determined by the cutting method of JIS H0501 using a metallographic photograph or an enlarged photograph of an electron microscope after the surface of the sintered body was mirror-finished.

[0045]

As described above, according to the present invention, a plurality of slitter upper blades and a plurality of slitter lower blades are coaxially set, and an aluminum foil is sandwiched between the slitter upper blades and the slitter lower blades. A blade for cutting an aluminum foil, which is obtained by cutting a shaft by rotating the shaft in a relatively opposite direction, wherein the average crystal particle diameter of the main component tungsten carbide is 0 as a material for the slitter upper blade and the slitter lower blade. .5μm below, fracture toughness consists ^{23MNm -3/2} or more ultrafine cemented carbide, since it has a surface roughness of the cutting edge near the center line average roughness and (Ra) 1 [mu] m or less, the wear resistance is very The blade was expensive and had almost no aluminum foil adhesion, which is a problem in the process. Further, the present invention is a donut disk shape, and a cutting edge portion having a minute chip width of 1 to 4 μm and a pair of inclined peripheral surfaces on both sides thereof are formed on the outer peripheral portion thereof, and the cutting portion is applied to an optical fiber to make a cut. a fiber cutting blade to put the average crystal grain size of tungsten carbide constituting the main component as a material of said edge is 0.5μm or less, the fracture toughness is a 23MNm ^-3/2 or more ultrafine cemented carbide inclined Since the surface roughness of the surface is center line average roughness (Ra) of 1 μm or less, the wear resistance is very high, cracks do not occur on the ground surface, and the variation in chip size is very small. We were able to.

[Brief description of drawings]

FIG. 1 is a side view showing an aluminum foil cutting blade according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a portion A in FIG.

FIG. 3 is a perspective view showing a usage state of an aluminum foil cutting blade according to another embodiment of the present invention.

FIG. 4 is a perspective view showing a usage state of a blade for cutting an optical fiber according to another embodiment of the present invention.

5 is an enlarged cross-sectional view of the blade shown in FIG.

[Explanation of symbols]

1 Slitter upper blade 2 slitter lower blade 3 aluminum foil 4 cutlery 4a Blade part 4b inclined peripheral surface 5 optical fiber a gap b Chip width

Claims (2)

(57) [Claims] 1. A slitter upper blade and a slitter lower blade, respectively.
Set multiple pieces on the same axis, and use the slitter upper blade and
Insert the aluminum foil between the lower blades of the cutter
Blade for cutting aluminum foil that rotates in the opposite direction, cuts, and winds
And the material of the slitter upper blade and the slitter lower blade
As the average crystal grain size of tungsten carbide constituting the main component 0.5μm or less, the fracture toughness is a ^{23MNm -3/2} or more ultrafine particles cemented carbide, the surface roughness of the cutting edge near
The center line average roughness (Ra) is set to 1 μm or less.
A blade for cutting aluminum foil . 2. A donut disk shape, the width of which is on the outer periphery thereof.
Cutting edge part having a minute chip width of 1 to 4 μm and both sides thereof
A pair of inclined peripheral surfaces of
It is a cutting tool for cutting optical fiber
As a material of the above-mentioned blade,
Average crystal grain size of 0.5 μm or less, fracture toughness of 23
MNm ^-3/2 consists of more ultra-fine cemented carbide, slope
The surface roughness of the surface is a center line average roughness (Ra) of 1 μm or less.
A blade for optical fiber cutting characterized by