KR101599201B1 - Flat blade-shaped cutting blade and green sheet cutting blade - Google Patents

Abstract

An object of the present invention is to provide a cutting edge that satisfies both stable shape accuracy and processability and can suppress slant cutting. The blade portion 7 serving as a cutting execution portion of the flat blade 1 of the present invention has a left blade surface 9a and a right blade surface 9b inclined to approach each other from both the left and right sides of the base portion 5, And has a tip end edge 11 having a convex curved surface and is formed so as to connect the right side face 9a and the right side face 9b and has two straight lines 13a and 13b along the left side face 9a and the right side face 9b, The shortest distance between the intersection point and the tip end 11 is 1 占 퐉 or more and 10 占 퐉 or less and the length of the tip end 11 is different from left to right with respect to the center line 21 and the difference is 1 占 퐉 or more and 20 占 퐉 or less And the internal angle of the intersection angle of the two straight lines along the right and left flats is not less than 4 degrees and not more than 60 degrees.

Description

FLAT BLADE-SHAPED CUTTING BLADE AND GREEN SHEET CUTTING BLADE [0002]

The present invention relates to a flat-shaped cutting blade and a green sheet cutting blade.

As a method for producing a multilayer ceramic capacitor, a laminated varistor, a laminated coil, a laminated piezoelectric actuator and the like, a paste-like sheet including a mixture of a dielectric ceramic powder and a binder is used and laminated (referred to as a green sheet) Cut into a product shape, and then fired to attach electrodes to both ends.

Here, in recent years, there has been an increasing demand for small-sized capacitors for small-sized devices such as smart phones, which require high-level shape accuracy. In order to realize such a small-size ceramic capacitor, it is necessary to take care that a perpendicular cut surface is formed as much as possible and no damage is given to the cut surface at the time of cutting the green sheet.

As a cutting method of the green sheet, there are a method of cutting with a rotating round blade called a dicing method and a guillotine method of cutting with a flat blade.

The dicing method has a drawback in that the material yield is worse than that of the guillotine method and the cutting speed is also lower because only cutting precision is higher than that of the guillotine method. However, as the size of the green sheet after cutting becomes smaller, Lt; / RTI >

Here, the flat blade is a blade having a cutting portion contributing to cutting, that is, a blade portion having a blade tip and a base portion (also referred to as a shank) having a parallel surface for fixing the blade to the cutting device.

The flat-shaped cutting blade is required to have a good cutting quality (low shear resistance at the time of cutting), abrasion resistance, adhesion to the workpiece to be cut, strength against buckling, and long life (The term " lifetime " as used herein refers to a point in time when the cross-sectional shape of the cut material is chipped by chipping, and in the case of a cutting blade for a multilayer capacitor, if peeling of the laminated film occurs, being).

For example, Patent Document 1 discloses a structure in which a vertical cut surface can be formed by forming an arrow-shaped step on a cross-section of a blade edge (Patent Document 1).

On the other hand, with respect to the shear resistance, in particular, the shape of the blade is important, and considering the damage to the material to be cut, it is preferable that the blade is thin and the angle of the tip of the blade is small. However, it is inevitable that the strength gets worse as the day gets thinner. As a result, the currently used cutting blades are devised to increase the angle of the leading edge of the blade by giving an angle of one or a plurality of stages between the blade tip and the base.

For example, Patent Document 2 discloses a structure in which the shear resistance is reduced and the buckling strength is increased by forming the blade edge portion at a plurality of concave curved surfaces (Patent Document 2).

Japanese Utility Model Application Publication No. 63-197089 Japanese Patent Application Laid-Open No. 10-217181

However, even in the case of using the blade tip as in Patent Document 2, it is difficult to secure the strength of the blade tip.

The flat blade is made of a hard material such as a cemented carbide, for example, in addition to stainless steel. In particular, when the hard material is a hard material, it is a difficult cutting material and tough because of its low toughness. Further, in the case of a thin blade, even in the case of a hard material, a blade tends to be relieved due to the pressing of a grinding stone, particularly at the tip of the blade edge. However, in the structures of Patent Documents 1 and 2, machining with high precision is not easy and there is a problem in terms of practicality.

In addition, when cutting is performed, the dimension of the material to be cut is different between the left and right sides of the cutting edge. Therefore, when the size of the product is significantly smaller than that of the green sheet, It is necessary to suppress inclined cutting by so-called " relief ".

However, there is a problem that the structures of Patent Documents 1 and 2 are not structured to be able to suppress inclined cutting.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to provide a cutting blade that satisfies both stable shape accuracy and cutting performance and can suppress slant cutting.

In order to solve the above problem, the present inventor has examined whether or not warp cutting can be suppressed while securing the strength of the blade tip and lowering the shear resistance at the time of cutting.

As a result, it has been found that the shape of the tip of the blade tip is designed, in particular, by intentionally making the blade tip shape asymmetrical, it is possible to reduce the shear resistance at the time of cutting, Thus, the present invention has been accomplished.

That is, according to a first aspect of the present invention, there is provided a method of manufacturing a base plate, comprising: a base plate portion having a flat plate shape; left and right side surfaces inclined to approach each other from both sides of the base portion; Wherein a cross section of two straight lines along the left and right flute surfaces and a shortest distance between tip ends of the blade tip are 1 占 퐉 or more and 10 占 퐉 or less and the length in the center line direction of the tip portion having the convex curved surface is And the difference between the center line of the base part and the center line is not less than 1 占 퐉 and not more than 20 占 퐉 and the internal angle of the intersection angle of the two straight lines along the right and left side faces is not less than 4 degrees and not more than 60 degrees It is a flat cutting blade.

A second aspect of the present invention is a green sheet cutting edge characterized by having a flat blade cut in accordance with the first aspect.

According to the present invention, it is possible to provide a cutting blade that satisfies both stable shape accuracy and cutting performance, and can suppress inclined cutting.

Fig. 1 is a side view showing the outline of the shape of the flat-shaped cutting blade 1. Fig.
2 is a perspective view of FIG.
3 is a cross-sectional view showing the tip shape of the flat-shaped cutting blade 1. Fig.
4 is an enlarged view of the vicinity of the connection portion 15 in Fig.
5 is a cross-sectional view for explaining the oblique cutting.
6 is a sectional view for explaining the oblique cutting.
Fig. 7 is a schematic diagram showing a method of working the tip of the flat-shaped cutting blade 1.
Fig. 8 is a schematic view showing a method for machining the tip of the flat-shaped cutting blade 1. Fig.
Fig. 9 is a schematic diagram showing a method for machining the tip of the flat-shaped cutting blade 1. Fig.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments suitable for the present invention will be described in detail with reference to the drawings.

First, the shape of the flat-blade cutting blade 1 according to the embodiment of the present invention will be described with reference to Figs. 1 to 6. Fig.

Here, the green sheet cutting edge is illustrated as the flat cutting edge 1.

1, the flat blade 1 has a flat base portion 5 having a rectangular planar shape and a base portion 5 provided on a long side of one side of the base portion 5, And a cutting edge portion 7 serving as a cutting execution portion for cutting the cutter blade 100.

The base portion 5 is provided with a fixed portion 5a having a linear portion parallel to the drawing as shown in the figure and a connecting portion 5b for connecting the fixed portion 5a and the blade portion 7 to the fixed portion 3 of the cutting device ).

1 and 2, the length L of the long side direction of the flat cutting edge 1, the length H of the short side H, the height H1 of the edge portion 7, the thickness of the flat cutting edge 1 Quot; T ".

3, the blade portion 7 has a left side face 9a, a right side face 9b, a left side face 9a and a right side face 9b inclined to come close to each other from both the left and right sides of the base portion 5, And a blade edge 11 formed to connect the right blade surface 9b.

3, the cross-sectional shape of the blade edge portion 7 in the plate thickness direction is determined by the intersection of two straight lines 13a and 13b along the left and right side faces 9a and 9b, It is preferable that the shortest distance X of the tip 11 is 1 占 퐉 or more and 10 占 퐉 or less.

When the value is less than 1 탆, damage is likely to occur at the edge of the blade. On the other hand, if it exceeds 10 탆, a large cutting resistance occurs when the cutting edge enters the material 100 to be cut. In addition, it is likely to have a short life due to abrasion. More preferably, it is 1.5 탆 or more and 5 탆 or less.

Further, as shown in Fig. 3, the flat blade 1 has a convex curved surface at the blade tip 11 in advance. The convex curved surface means a curved surface shape expanded to the outside. By making the blade tip 11 have a convex curved surface, the strength of the blade tip and the low cutting resistance can be made compatible. 4, when the cross-sectional shape of the connecting portion 15 between the left side face 9a, the right side face 9b and the blade tip 11 in the plate thickness direction is formed by a curved line, good.

The sectional shape of the blade tip 11 in the plate thickness direction is set such that the blade tip 11 has a length that passes through the center line 21 (the center in the thickness direction of the base portion 5, Parallel straight line]. That is, the cross-sectional shape of the blade tip 11 in the plate thickness direction is asymmetrical with respect to the center line 21.

3, the shortest distance Y1 on the left-side surface 9a side from the tip end 17 of the blade tip 11 to the connection portion 15 and the shortest distance Y2 on the right-side blade surface 9b side, (Absolute value of Y1-Y2) is 1 占 퐉 or more and 20 占 퐉 or less.

The reasons for this shape will be described.

As described above, when cutting is performed using the flat-blade cutting blade 1, since the sizes of the pieces to be cut are different on the left and right sides of the cutting blade, they are difficult to cut vertically. Particularly, It is necessary to suppress the inclined cutting by the so-called " relief " that is liable to be deformed at the time of cutting.

More specifically, for example, as shown in Fig. 5, when cutting the object 100 to be cut with a right-left symmetrical blade, the right region 101 (product side) of the left region 103 (sheet side) The length of the flat cutting edge 1 in the horizontal direction is shorter.

In this case, since the left region 103 is hardly subjected to plastic deformation at the time of cutting (it is difficult to deform in the direction of A in Fig. 5), the cut surface is difficult to be oblique cut. However, The cutting surface of the right side region 101 is finally made to be in contact with the left side region 103 as compared with the left side region 103. As a result, The inclined cutting shown in Fig. This depends on the properties of the material to be cut and the size of the product to be cut from the material to be cut. However, the smaller the size of the material to be cut in the horizontal direction (the left and right direction in FIG.

Therefore, in the present embodiment, the cross-sectional shape of the blade tip 11 in the thickness direction is made different from the left and right in advance, thereby absorbing the " relief "

In this case, as shown in Fig. 6, Y1 and Y2 are compared, and the longer side (here, the left side 9a side) is the shorter side in the horizontal direction )].

When the difference (the absolute value of Y1-Y2) is less than 1 占 퐉, the right and left side faces are almost symmetrical. Therefore, when the product to be cut is small, the effect of the oblique cutting is difficult to obtain.

On the other hand, if this difference exceeds 20 mu m, it is not preferable because it is likely to be inclined cutting in the reverse direction.

The difference (the absolute value of Y1-Y2) is more preferably 2 m or more and 10 m or less.

The shape of the blade tip 11 is such that the internal angle? Of the intersection angle of the two straight lines 13a and 13b along the left blade surface 9a and the right blade surface 9b is 4 degrees or more and 60 degrees or less desirable.

This is because, when? Is less than 4 degrees, the cutting resistance is reduced, but chipping of the blade tip is liable to occur, which adversely affects the cut surface or deteriorates the service life of the cutting blade.

When? Exceeds 60 degrees, a large load is generated when the blade tip enters the material to be cut 100, resulting in a decrease in buckling resistance and abrasion resistance. In this case, the amount of plastic deformation of the material to be cut 100 becomes large, and the surface of the material to be cut 100 is liable to be scratched. Further, the cut surface tends to become oblique rather than vertical, The resistance increases.

Further, from the viewpoint of securing both the strength of the blade edge and the low cutting resistance, it is more preferable that theta is 10 degrees or more and 30 degrees or less.

This completes the description of the shape of the flat blade 1.

The material constituting the flat blade 1 is suitably selected in accordance with the material to be cut. Specific examples of the material include carbon tool steel and WC-Co cemented carbide.

Next, a method of working the blade edge portion 7 of the flat blade 1 will be described with reference to Figs. 7 to 9. Fig.

The method of working the blade tip 7 of the flat blade 1 is not particularly limited as long as it can process the blade tip as described above, but the following method can be exemplified.

The left side face 9a, the right side face 9b and the straight lines 13a and 13b are formed by linearly machining the distal end (long side) of the connecting portion 5b of the base portion 5.

This linear machining is performed, for example, by grinding with a grinding wheel.

Next, processing for forming the tip end 11 of the blade tip is performed on the blade tip portion 7.

As described above, since the shape of the blade tip 11 has a convex curved surface, as in the case of forming the left blade surface 9a and the right blade surface 9b, in the pressing process by the grinding wheel, Therefore, the blade tip is easily relieved from the grinding wheel at the time of machining, and stable machining is not easy.

Therefore, the machining of the blade tip 11 can be performed by (1) a method of forming a blade tip 11 in a solution having abrasive grains, or (2) a method of mixing abrasive grains or other hard materials, that is, a metal powder or a ceramics powder And a method of forming a blade edge 11 by using a solid material.

Hereinafter, a specific processing method will be described.

7, a solution 201 containing a hard material is filled in a suitable container 203, and the solution is injected into the solution 201 in the form of a flat-shaped cutting blade 1, The tip end portion 11 is formed by contacting the hard material and the blade tip portion 7 in the solution 201 by performing the reciprocating sliding in the blade length direction for a predetermined time .

As specific examples of the hard material, a diamond lump having a high hardness can be obtained because it requires a short processing time, but other metal powders and ceramic powders may be used.

Further, the solvent of the solution 201 is, for example, water.

Next, the method shown in (2) is a method in which the solid material 205 obtained by mixing the hard material powder is cut into the flat cutting edge 1, as shown in Fig. 8, And the blade tip 7 is contacted with the blade tip 7 to form the blade tip 11 on the blade tip 7.

The solid material 205 may be, for example, a clay material.

Examples of the hard material include powders of diamond, W, Mo, WC, Al ₂ O ₃ , TiO ₂ , TiC, TiCN, SiC, Si ₃ N ₄ and BN.

It is preferable that the average particle diameter of the secondary particles is 1 占 퐉 or less as Fsss (Fisher Sub-Sieve Sizer) particle size of the hard material. This is because, if it exceeds 1 탆, there is a possibility that damage is generated in the processing of the blade tip surface. It is preferable that the shape of the flat-blade cutting blade is more precisely as the fine grain size is. However, since it takes a long time for machining, it is necessary to process particles having sizes close to 1 탆 within this range, Of hard material particles. By being uniformly dispersed in fine grains, uniform edge processing can be achieved.

As described above, the cross-sectional shape of the blade tip 11 of the blade-shaped blade 1 in the plate thickness direction is set so that the distance from the blade tip 17 to the connection portion 15 is larger than the distance It is necessary to perform machining so that the cross-sectional shape in the plate thickness direction is different from the left and right, regardless of whether the method (1) or (2) is used.

As an example of such a processing, there is a method of performing coating processing on one side of the blade tip 11, as shown in Fig. 9, during at least the final processing in the processing. Namely, as shown in Fig. 9, when the coating film 31 is formed on one side, the hardness of the left and right surfaces of the blade tips 11 becomes different from each other. Therefore, when machining is performed in this state, a difference in the amount of right and left machining (amount of polishing) is produced due to the difference in hardness, so that machining can be performed so that the cross-sectional shape in the plate thickness direction is different from left to right.

Here, examples of the coating method include a method of forming a sub-mu m to several mu m coating by sputtering, which is a kind of PVD (Physical Vapor Deposition).

At this time, it is possible to perform masking on the surface on which the coating process is not to be performed, or to arrange the cutting blade before coating (for example, on the opposite side of the target).

The kind of the coating film is not particularly limited, and it may be Ti-based, Fe-based, nonmetal, and has a lower hardness than the material of the flat-shaped cutting blade 1.

By covering such a coating film only on one side, for example, it is possible to process the edge of the tip of the blade tip into a left-right asymmetric shape by processing in the abrasive solution, and the degree of asymmetry (Y1 and Y2) It becomes possible. Further, the coating film is finally polished by processing and disappears.

It is not always necessary to form the blade faces 9a and 9b on both sides of the film, but only the one face of the blade of the flat blade 1 is subjected to a blade forming process, It is also possible to carry out a blade forming process on the one side. The flat-shaped cutting blade 1 having the one surface coated in this manner can be finished with the flat-shaped cutting blade of the above-described shape, for example, by treating it in a solution containing a hard material.

The above is a description of a method for machining the blade edge 7 of the flat blade.

As described above, according to the present embodiment, the blade edge portions 7, which are the cutting execution portions of the blade-like cutting blade 1, are formed by the left side surface 9a and the right side surface 9b And a blade tip end 11 having a convex curved surface and formed so as to connect the left blade surface 9a and the right blade surface 9b and having two straight lines 13a and 13b and the shortest distance of the blade tip 11 is 1 占 퐉 or more and 10 占 퐉 or less and the length of the blade tip 11 is different from left to right with respect to the center line 21, Or more and 20 占 퐉 or less and the internal angle of the intersection angle of two straight lines along the left and right flute surfaces is 4 degrees or more and 60 degrees or less.

As a result, the flat blade 1 satisfies both stable shape accuracy and cutting performance, and can suppress slant cutting.

Example

Hereinafter, the present invention will be described in more detail based on examples.

(Example 1)

A cutting test using a flat cutting edge 1 made by a method of forming a cutting edge 11 in a solution having abrasive grains was carried out to evaluate the effect of the shape of the cutting edge 11 on the chipping property, Respectively. The concrete procedure is as follows.

≪ Processing of the flat-shaped cutting blade 1 >

First, a plate material in the form of a flat plate having a blade length direction L of 100 mm, a short side direction length H of 20 mm, a thickness T of 0.1 mm (see Fig. 2) and a material made of cemented carbide FM10K And the left side faces 9a and 13a and the right side faces 9b and 13b were formed by polishing with a conventional technique using a grinding stone so as to be left-right symmetrical with respect to the cross section in the thickness direction on one side of the long side.

Thereafter, a TiN film was formed to a thickness of 2 μm from the edge of the blade edge to a position of 1 mm by a sputtering method using SPF-332 manufactured by Nichiden Anbar BV.

Next, as shown in Fig. 7, the edge of the flat blade 1 is immersed only in the blade tip in the solution 201 having a hard material and reciprocally slid in the blade length direction for a predetermined time, .

PC-1-W (Fsss particle size of 1 mu m) manufactured by Wada Trading Co. Ltd. and PC-N100-W (particle size of 0.1 mu m) were used as a solution having a hard material.

Although not shown in the drawing, the solution 201 (aqueous solution) is slid while being stirred so as to have a uniform concentration while paying attention so as not to affect edge processing, and the slide time is adjusted so that the tip So that a flat-shaped cutting blade 1 having a tip 11 was obtained. Here, the connection portion 15 in Fig. 4 was a curve.

≪ Evaluation of Flat Cutting Edge 1 >

Next, the flat-shaped cutting blade 1 was evaluated in the following order.

First, a material to be cut is prepared.

Here, as described above, the flat-shaped cutting blade 1 is mainly a cutting blade for a green sheet, but a metal powder is mixed with the oil clay to prepare an acceleration test. This is because it is difficult to select a green sheet having typical characteristics because the difference in the characteristics (mechanical strength such as shear resistance) of each product of the green sheet of the product is large and also for the purpose of evaluation.

The metal powder was a material corresponding to ceramics powder in the green sheet, and the oil clay was regarded as a material corresponding to the binder in the green sheet.

The concrete material production method and the cutting test procedure are as follows.

First, W powder having an Fsss particle size of 1 占 퐉 was mixed at a weight ratio of 100:20 with respect to the waxy clay poppies made by Chubu Denki Kogyo Co.,

Next, this mixture was molded to a thickness of 1 mm at a press pressure of 10 kg / cm 2 to prepare a cut material.

Next, as shown in Fig. 1, the flat-shaped cutting blade 1 was assembled to a cutting apparatus, and the material was continuously cut with a cutting speed of 10 mm / sec. Here, when cutting continuously, each time the flat cutting blade 1 rises so that the to-be-cut object is not cut twice at the same horizontal position, it can move in the horizontal direction. Further, the dimension in the width direction of the material to be cut was 1 mm. A schematic view is shown in Fig.

Further, in order to completely cut the cut material, a lower hardness was required at the lower part of the cut material than that of the cut material, and the No. 1 qualitative filter paper made by Toyo Roshi Co., Ltd. was laid.

Table 1 shows the state of the cutting edge before cutting and after the cutting was performed 1000 times.

In Table 1, the intersection point of the two straight lines 13a and 13b along the left side face 9a and the right side face 9b and the shortest distance between the tip end 11 and the left side face 9a and the right side face 9b are denoted by X (占 퐉).

As the confirmation of the evaluation, the presence or absence of chipping of the blade edge, the degree of abrasion of the blade edge, the state of the cut surface of the piece to be cut and the presence or absence of the inclined cutting were evaluated.

Specifically, the presence or absence of chipping is evaluated by observing the entire surface in the longitudinal direction of the blade in an enlarged manner. When the damage is not observed or when the damage is less than 5 占 퐉, Quot; DELTA ", and a case where there was damage of 10 mu m or more was judged as " X ". Observations were made at 200x magnification with an Olympus microscope STM6-LM.

The degree of abrasion of the blade edge was evaluated as "? &Quot; when the distance of H1 in Fig. 2 was shorter than 5 占 퐉, And when it was shorter than 10 mu m, it was judged to be " x ".

The state of the cut surface of the cut material was also observed with a microscope, and when it was found that scratches of less than 5 占 퐉 in width were observed with respect to scratches of the 1000th cut surface, "?" Was observed when scratches of 5 占 퐉 or more and less than 10 占 퐉 were observed, &Quot; x " was determined when scratches of more than < RTI ID = 0.0 >

The evaluation of the presence or absence of the oblique cut was carried out by observing the cut surface of the to-be cut with a thickness of 1 mm and a cut-off width of 2 mm by an optical microscope after cutting to see whether it was cut vertically. , &Quot;? &Quot;, "? &Quot;, "? &Quot;, " Respectively.

As apparent from Table 1, the samples (Sample Nos. 1 to 8 and 25 to 52) having the shortest distance X of 1 to 10 mu m and the absolute value of Y1-Y2 of 1 mu m or more and 20 mu m or less, , The degree of abrasion of the blade edge, the state of the cut surface of the workpiece to be cut, and the inclined cutting were evaluated as "?", "?" Or "?".

On the other hand, the samples (Sample No. Comparative Examples 1 to 2 and 6 to 9) in which the shortest distance X is out of this range are either one of the chipping of the edge, the degree of abrasion of the edge, Quot; X " evaluation).

As for the oblique cutting, the larger the blade angle is, the larger the inclined cutting becomes. In particular, with respect to the left and right symmetrical blades (Comparative Examples 1, 6 and 8) Quot ;, but Comparative Example 6 in which the angle of the blade edge was 30 degrees was " DELTA " and Comparative Example 8 in which the blade angle was 60 degrees was " x "

On the other hand, in Comparative Example 3 in which the blade angle was 3 degrees, the presence or absence of chipping of the blade tip, the degree of abrasion of the blade tip, and the state of the cut surface of the blade were all " X ". In Comparative Example 10, which was 65 degrees, the degree of abrasion of the edge, the state of the cut surface of the workpiece to be cut, and the oblique cut state were "x".

(Example 2)

As a process for forming the blade tip 11 in Example 2, the blade tip 11 was formed by using the method of forming the blade tip 11 by using solid matter, and a cutting test was performed. The concrete procedure is as follows.

First, a plate material similar to that of Embodiment 1 is polished so as to be laterally symmetrical with respect to an end face in the thickness direction by a conventional technique using a grinding wheel so that the left side faces 9a and 13a and the right side faces 9b and 13b .

Thereafter, a TiN film was formed to a thickness of 2 μm from the tip of the edge to a position of about 1 mm by sputtering under the same conditions as in Example 1 on one side.

Next, titanium oxide powder of F3 grade manufactured by Showa Denko Kogyo Co., Ltd. was mixed at a weight ratio of 100: 50 to a clay poppy of Chubu Dengeki Kogyo K.K. So as to be homogeneous in the induction. This mixture was molded into a thickness of 1 mm at a press pressure of 10 kg / cm 2.

Here, the value of the specific surface area BET (Brunauer, Emmet and Teller) of the titanium oxide was 36 m 2 / g, and in the scanning electron microscopic observation using the Hitachi High-Technologies Field Radiation Scanning Electron Microscope S-420 manufactured by Kabushiki Kaisha, Mu m.

As shown in Fig. 1, this solid was used as a cut material, and the flat cutting blade 1 was assembled into a cutting device, and the cutting speed of the cutting blade was continuously cut at 5 mm / sec. Here, when cutting continuously, the cut piece was moved in the horizontal direction every time the flat cut blade 1 was lifted so that the cut piece would not be cut twice at the same horizontal position (see FIG. 8). The number of cuttings was adjusted to adjust the tip end 11 in the shape shown in Table 2.

Here, the connecting portion 15 in Fig. 4 was a curve.

Next, the same material as in Example 1 was cut by the same method with the obtained flat-blade cutting blade 1, and in the same manner as in Example 1, the presence or absence of chipping of the blade edge, the degree of abrasion of the blade edge, And the presence or absence of oblique cutting was evaluated.

The results are shown in Table 2.

As apparent from Table 2, the samples (Sample Nos. 9 to 24) having the shortest distance X of 1 to 10 mu m and the absolute value of Y1-Y2 of not less than 1 mu m and not more than 20 mu m, The results similar to those of Example 1 were obtained by evaluating the degree of abrasion, the state of the cut surface of the workpiece to be cut and the inclined cutting to be "? &Quot;

(Example 3)

Shaped cutting edge 1 similar to that of the sample Nos. 1 to 8 of Example 1 was produced, and the cut test was performed with the size of the cut-out in the width direction set to 0.5 mm.

The results are shown in Table 3.

As is clear from Table 3, even when the same day as in Example 1, the evaluation of warp cutting shows a slight deterioration tendency as the product size becomes smaller. From this result, it was found that the small-sized product was more prone to incline cutting.

Although the present invention has been described based on the embodiments and examples, the present invention is not limited to the above embodiments.

Those skilled in the art will appreciate that various modifications and improvements within the scope of the present invention are also contemplated and are within the scope of the present invention.

1: Cutting edge
3: Cutting device fixture
5: Base portion
5a: Defendant Government
5b: Connection
7:
9a: Left side face
9b: Right side face
11: the tip of the blade
15: Connection
21: Center line
31: Coating
100: Cutting material
201: solution
203: container
205: solids
X: Shortest distance
Y1: Distance
Y2: Distance
θ: Cabinet

Claims (6)

A flat base plate portion,
A left and right blade surface inclined to approach each other from both sides of the base portion,
A blade tip formed to connect the left and right blade surfaces and having a convex curved surface,
In the cross sectional shape in the plate thickness direction, the intersection of two straight lines along the right and left cut surfaces and the shortest distance of the tip of the blade tip are 1 占 퐉 or more and 10 占 퐉 or less,
The shortest distance along the center line of the base portion from the leading edge of the blade edge to the connecting portion of the right and left blade surfaces is different from the right and left directions and the shortest distance along the center line of the base portion from the blade tip to the connection portion on the left- And the shortest distance along the center line of the base portion from the right side surface to the above-mentioned right side surface is 1 占 퐉 or more and 20 占 퐉 or less,
Wherein the internal angle of the intersection angle of the two straight lines along the right and left cut surfaces is not less than 4 degrees and not more than 60 degrees. The method according to claim 1,
The shortest distance along the center line of the base portion from the leading edge of the blade tip to the connecting portion of the right and left blade surfaces is different from the left and right direction and the shortest distance along the center line of the base portion from the tip of the blade tip to the connection portion of the left- Wherein the difference in the shortest distance along the center line of the base portion to the connection portion on the right side surface is 2 占 퐉 or more and 10 占 퐉 or less. The method according to claim 1,
Wherein at least a cross-sectional shape of the connecting portion between the left and right blade surfaces and the tip of the blade edge in the thickness direction is a curved line. The method according to claim 1,
Wherein a shortest distance between an intersection of two straight lines along the left and right blade faces and a tip of the blade tip is 1.5 占 퐉 or more and 5 占 퐉 or less. The method according to claim 1,
Wherein an internal angle of an intersecting angle of two straight lines along the left and right blade surfaces is 10 degrees or more and 30 degrees or less. A green sheet cutting blade having the flat blade according to any one of claims 1 to 5.

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