JPWO2020130092A1 - Flat blade cutting blade - Google Patents

Abstract

The outer shape of the first blade portion includes a first inclined surface that is linearly inclined with respect to the center line so as to become thinner as the distance from the base portion increases in the extending direction (Z direction), and a tip portion that serves as a cutting edge. Have. In the vertical cross section, the outer shape of the second blade portion has a second inclined surface that is gently inclined linearly with respect to the center line and is in contact with the first inclined surface. In the vertical cross section, the outer shape of the third blade portion has a concave curved surface that is concavely curved toward the center line and is in contact with the second inclined surface. In the extending direction (Z direction), the length L2 of the second blade portion is less than the length L1 of the first blade portion, and is 20 μm or more and 120 μm or less.

Description

The present invention relates to a flat-blade cutting blade. This application claims priority based on Japanese Patent Application No. 2018-238359 filed on December 20, 2018. All the contents of the Japanese patent application are incorporated herein by reference.

As prior art documents that disclose the configuration of a flat-blade-shaped cutting blade that push-cuts a sheet-shaped object to be cut, JP-A-10-217181 (Patent Document 1) and JP-A-2001-158016 (Patent Document 2). , International Publication No. 2014/050883 (Patent Document 3).

Japanese Unexamined Patent Publication No. 10-217181 Japanese Unexamined Patent Publication No. 2001-158016 International Publication No. 2014/050883

The flat-blade cutting blade based on one aspect of the present disclosure includes a base portion and a blade portion. The base is flat and extends along the centerline. The blade portion extends from the extending direction end of the base portion. The blade portion includes a first blade portion, a second blade portion, and a third blade portion. The first blade portion is located farthest from the base portion in the extending direction. The second blade portion is located adjacent to the base portion side with respect to the first blade portion in the extending direction. The third blade portion is located between the second blade portion and the base portion in the extending direction. In the vertical cross section extending in both the thickness direction orthogonal to the extending direction and the extending direction, the outer shape of the first blade portion becomes thinner as the distance from the base portion in the extending direction increases. It has a first inclined surface that is inclined linearly with respect to the blade, and a tip portion that serves as a cutting edge. In the vertical cross section, the outer shape of the second blade portion has a second inclined surface that is gently inclined linearly with respect to the center line and is in contact with the first inclined surface. In the vertical cross section, the outer shape of the third blade portion has a concavely curved surface that is concavely curved toward the center line and is in contact with the second inclined surface. In the extending direction, the length of the second blade portion is less than the length of the first blade portion, and is 20 μm or more and 120 μm or less.

A flat-blade cutting blade according to another aspect of the present disclosure includes a flat plate-like base extending along a center line and a blade extending from an extending direction end of the base. The blades are the first blade located farthest from the base in the extending direction, the second blade located adjacent to the base side with respect to the first blade in the extending direction, and the blade in the extending direction. Includes a third blade located between the second blade and the base. In the longitudinal section extending in both the thickness direction and the extending direction orthogonal to the extending direction, the outer shape of the first blade portion is on the side away from the center line so as to become thinner as the distance from the base increases in the extending direction. It has a first inclined surface that is curved in a convex shape, and a tip portion that serves as a cutting edge. In the vertical cross section, the outer shape of the second blade portion has a second inclined surface that is gently and linearly inclined with respect to the center line than the average inclination of the first inclined surface and is in contact with the first inclined surface. In the vertical cross section, the outer shape of the third blade portion has a concavely curved surface that is concavely curved toward the center line and is in contact with the second inclined surface. In the extending direction, the length of the second blade portion is less than the length of the first blade portion, and is 20 μm or more and 120 μm or less.

A flat-blade cutting blade based on yet another aspect of the present disclosure comprises a base and a blade. The base is flat and extends along the centerline. The blade portion extends from the extending direction end of the base portion. The blade portion includes a first blade portion, a second blade portion, and a third blade portion. The first blade portion is located farthest from the base portion in the extending direction. The second blade portion is located adjacent to the base portion side with respect to the first blade portion in the extending direction. The third blade portion is located between the second blade portion and the base portion in the extending direction. In the vertical cross section extending in both the thickness direction orthogonal to the extending direction and the extending direction, the outer shape of the first blade portion becomes thinner as the distance from the base portion in the extending direction increases. It has a first inclined surface that is inclined linearly with respect to the blade, and a tip portion that serves as a cutting edge. In the vertical cross section, the outer shape of the second blade portion has a convex curved surface that is convexly curved toward a side away from the center line and is in contact with the first inclined surface. In the vertical cross section, the outer shape of the third blade portion has a concavely curved surface that is concavely curved toward the center line and is in contact with the convexly curved surface. In the extending direction, the length of the second blade portion is less than the length of the first blade portion, and is 20 μm or more and 120 μm or less.

FIG. 1 is a perspective view showing a state in which a sheet-shaped cutting object is pressed and cut using the flat-blade cutting blade according to the first embodiment of the present invention. FIG. 2 is a side view of the flat blade-shaped cutting blade of FIG. 1 as viewed from the direction of arrow II. FIG. 3 is an enlarged side view showing a part III of the flat-blade cutting blade of FIG. FIG. 4 is an SEM observation image showing an example of the cut surface evaluated as having large irregularities (scratches) on the cut surface in Experimental Example 1. FIG. 5 is an SEM observation image showing an example of the cut surface evaluated as having slight irregularities that are not scratches on the cut surface in Experimental Example 1. FIG. 6 is an SEM observation image showing an example of a cut surface evaluated as a uniform surface in which no unevenness is observed on the cut surface in Experimental Example 1. FIG. 7 is a side view showing the outer shape of the flat-blade cutting blade according to the second embodiment of the present invention. FIG. 8 is an enlarged side view showing the VIII portion of the flat-blade cutting blade of FIG. 7. FIG. 9 is a side view showing the outer shape of the flat-blade cutting blade according to one aspect of the third embodiment of the present invention. FIG. 10 is a side view showing the outer shapes of the first inclined surface and the second inclined surface of the flat blade-shaped cutting blade shown in FIG. FIG. 11 is a side view showing the outer shape of the flat-blade cutting blade according to another aspect of the third embodiment of the present invention. FIG. 12 is a side view showing the outer shapes of the first inclined surface and the second inclined surface of the flat blade-shaped cutting blade shown in FIG. FIG. 13 is an SEM observation image showing a chipping of the cutting blade. FIG. 14 is a perspective view showing a flat blade-shaped cutting blade for explaining a cutting method in an experimental example. FIG. 15 is a cross-sectional view taken along the line XV-XV in FIG.

[Issues to be solved by this disclosure]
As the sheet-shaped object to be cut becomes denser and harder, the cutting resistance becomes higher and the cut surface is more likely to be scratched.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a flat-blade cutting blade capable of reducing cutting resistance and making it difficult for scratches to occur on the cut surface.
[Effect of the present disclosure]
According to the present invention, it is possible to reduce the cutting resistance and prevent the cut surface from being scratched.

[Explanation of Embodiments of the Present Invention]
The flat-blade cutting blade according to one aspect of the present invention is a flat-blade cutting blade that push-cuts a sheet-shaped object to be cut. The flat-blade cutting blade includes a base portion and a blade portion. The base is flat and extends along the centerline. The blade portion extends from the extending direction end of the base portion. The blade portion includes a first blade portion, a second blade portion, and a third blade portion. The first blade portion is located farthest from the base portion in the extending direction. The second blade portion is located adjacent to the base portion side with respect to the first blade portion in the extending direction. The third blade portion is located between the second blade portion and the base portion in the extending direction. In the vertical cross section extending in both the thickness direction orthogonal to the extending direction and the extending direction, the outer shape of the first blade portion becomes thinner as the distance from the base portion in the extending direction increases. It has a first inclined surface that is inclined linearly with respect to the blade, and a tip portion that serves as a cutting edge. In the vertical cross section, the outer shape of the second blade portion has a second inclined surface that is gently inclined linearly with respect to the center line and is in contact with the first inclined surface. In the vertical cross section, the outer shape of the third blade portion has a concavely curved surface that is concavely curved toward the center line and is in contact with the second inclined surface. In the extending direction, the length of the second blade portion is less than the length of the first blade portion, and is 20 μm or more and 120 μm or less.

In the flat-blade cutting blade according to one aspect of the present invention, in the vertical cross section extending in both the thickness direction and the extending direction of the base, the outer shape of the first blade portion is from the base in the extending direction of the base. It has a first inclined surface that is linearly inclined with respect to the center line so as to become thinner as the distance increases, and a tip portion that serves as a cutting edge, and the outer shape of the second cutting edge portion is second with respect to the center line. It has a second inclined surface that is gently inclined linearly from the inclination of the first inclined surface and is in contact with the first inclined surface, and the outer shape of the third blade portion is concavely curved toward the center line and is second inclined. It has a concave curved surface in contact with the surface, and in the extending direction, the length of the second blade is less than the length of the first blade, and it is 20 μm or more and 120 μm or less. While reducing the contact area between the object and the blade to reduce the cutting resistance, the corner portion on the base side of the first inclined surface in the vertical cross section can be blunted to prevent scratches on the cut surface.

The flat-blade-shaped cutting blade according to another aspect of the present invention is a flat-blade-shaped cutting blade that push-cuts a sheet-shaped object to be cut, and has a flat plate-shaped base extending along a center line and a base. It is provided with a blade portion extending from the end in the extending direction of. The blades are the first blade located farthest from the base in the extending direction, the second blade located adjacent to the base side with respect to the first blade in the extending direction, and the blade in the extending direction. Includes a third blade located between the second blade and the base. In the longitudinal section extending in both the thickness direction and the extending direction orthogonal to the extending direction, the outer shape of the first blade portion is on the side away from the center line so as to become thinner as the distance from the base increases in the extending direction. It has a first inclined surface that is curved in a convex shape, and a tip portion that serves as a cutting edge. In the vertical cross section, the outer shape of the second blade portion has a second inclined surface that is gently and linearly inclined with respect to the center line than the average inclination of the first inclined surface and is in contact with the first inclined surface. In the vertical cross section, the outer shape of the third blade portion has a concavely curved surface that is concavely curved toward the center line and is in contact with the second inclined surface. In the extending direction, the length of the second blade portion is less than the length of the first blade portion, and is 20 μm or more and 120 μm or less.

In the parallel cutting blade according to another aspect of the present invention, the outer shape of the first blade portion is curved convexly toward the side away from the center line so as to become thinner as the distance from the base portion increases in the extending direction. Since it has one inclined surface, it is possible to further suppress chipping during cutting by increasing the thickness of the blade.

Preferably, in the above vertical cross section, assuming that the internal angle sandwiched between the first inclined surfaces is θ1, 10 ° ≦ θ1 ≦ 30 ° is satisfied. In the above vertical cross section, when θ1 <10 °, the first blade portion becomes sharp, so that the sharpness of the first blade portion is improved, but the cutting edge is easily chipped and the rigidity of the first blade portion becomes insufficient. , It may be difficult to cut the object to be cut vertically. In addition, "there is a risk" indicates that there is a slight possibility that such a situation will occur, and does not mean that such a situation will occur with a high probability. When θ1> 30 °, the cutting resistance becomes large and the cut surface may be easily scratched.

Preferably, the blade portion extends symmetrically with respect to the center line, and in the vertical cross section, the internal angle sandwiched between the first inclined surfaces is θ1, and the line parallel to the center line and the second inclined surface are included. Assuming that the second inclination angle formed by is θ2, θ1 ≦ 25 ° and − (θ1) / 2 ≦ θ2 ≦ (θ1) / 2 are satisfied. If θ2 <− (θ1) / 2, the surface of the third blade may be easily scratched when forming the blade, and if θ2> (θ1) / 2, the cut surface may be scratched. May easily occur.

Preferably, the surface roughness (Sa) of the second inclined surface is 0.6 μm or less. If the surface roughness (Sa) of the second inclined surface exceeds 0.6 μm, the cutting resistance may increase.

The flat-blade cutting blade according to another aspect of the present invention is a flat-blade cutting blade that push-cuts a sheet-shaped object to be cut. The flat-blade cutting blade includes a base portion and a blade portion. The base is flat and extends along the centerline. The blade portion extends from the extending direction end of the base portion. The blade portion includes a first blade portion, a second blade portion, and a third blade portion. The first blade portion is located farthest from the base portion in the extending direction. The second blade portion is located adjacent to the base portion side with respect to the first blade portion in the extending direction. The third blade portion is located between the second blade portion and the base portion in the extending direction. In the vertical cross section extending in both the thickness direction orthogonal to the extending direction and the extending direction, the outer shape of the first blade portion becomes thinner as the distance from the base portion in the extending direction increases. It has a first inclined surface that is inclined with respect to the blade, and a tip portion that serves as a cutting edge. In the vertical cross section, the outer shape of the second blade portion has a convex curved surface that is convexly curved toward a side away from the center line and is in contact with the first inclined surface. In the vertical cross section, the outer shape of the third blade portion has a concavely curved surface that is concavely curved toward the center line and is in contact with the second inclined surface. In the extending direction, the length of the second blade portion is less than the length of the first blade portion, and is 20 μm or more and 120 μm or less.

In the flat blade-shaped cutting blade according to another aspect of the present invention, in the vertical cross section extending in both the thickness direction and the extending direction of the base, the outer shape of the first blade portion is in the extending direction of the base. It has a first inclined surface that is inclined with respect to the center line so that it becomes thinner as it goes away from the base, and a tip that serves as the cutting edge, and the outer shape of the second blade is convex toward the side away from the center line. It has a convex curved surface that is curved to the surface and is in contact with the first inclined surface, and the outer shape of the third blade portion has a concave curved surface that is concavely curved toward the center line and is in contact with the convex curved surface. Therefore, the contact area between the object to be cut and the blade portion is reduced to reduce the cutting resistance, and the corner portion on the base side of the first inclined surface in the vertical cross section is blunted to cause scratches on the cut surface. It can be made difficult.

Preferably, in the extending direction, the length of the second blade portion is less than the length of the first blade portion. When the length of the second blade portion is equal to or longer than the length of the first blade portion in the extending direction, the cutting resistance becomes large and the cut surface is liable to be scratched.

Preferably, the radius of curvature r of the convex curved surface of the second blade portion is 200 μm or more and 500 μm or less. When the radius of curvature is 200 μm or more, the stress applied to the cross section of the object to be cut by the second blade portion becomes small, and the cutting resistance becomes particularly small. Further, when the radius of curvature is 500 μm or less, the contact surface between the object to be cut and the second blade portion is reduced, and the cutting resistance is particularly reduced.

Preferably, the first inclined surface of the first blade portion is inclined linearly with respect to the center line in the vertical cross section, or is curved convexly toward the side away from the center line.

(Embodiment 1)
Hereinafter, the flat-blade cutting blade according to the first embodiment of the present invention will be described with reference to the drawings. In the following description of the embodiment, the same or corresponding parts in the drawings are designated by the same reference numerals, and the description will not be repeated.

FIG. 1 is a perspective view showing a state in which a sheet-shaped cutting object is pressed and cut using the flat-blade cutting blade according to the first embodiment of the present invention. As shown in FIG. 1, the flat blade-shaped cutting blade 100 according to the first embodiment of the present invention pushes and cuts a sheet-shaped cutting object 1 by moving in the vertical direction. The flat blade cutting blade 100 includes a base portion 110 and a blade portion 120.

The sheet-shaped object 1 to be cut is, for example, a ceramic green sheet before firing such as a laminated capacitor or a laminated inductor, a metal foil, a hard resin, or the like.

FIG. 2 is a side view of the flat blade-shaped cutting blade of FIG. 1 as viewed from the direction of arrow II. FIG. 3 is an enlarged side view showing a part III of the flat-blade cutting blade of FIG. As shown in FIGS. 1 and 2, the base 110 of the flat-blade cutting blade 100 according to the first embodiment of the present invention has a flat plate shape and extends along the center line C. The extending direction of the base 110 is the Z direction, the thickness direction orthogonal to the extending direction of the base 110 is the Y direction, and the width direction orthogonal to each of the extending direction and the thickness direction of the base 110 is the X direction. Is.

The blade portion 120 extends from the end of the base portion 110 in the extending direction (Z direction). In the present embodiment, the blade portion 120 extends symmetrically with respect to the center line C. However, the blade portion 120 may extend asymmetrically with respect to the center line C.

When the dimension of the other side of the object 1 to be cut is significantly smaller than the dimension of one side in the Y direction with the cutting position by the flat blade cutting blade 100 as a boundary, that is, the dimension of the object to be cut in the Y direction is remarkable. If it is small, when the sheet-shaped object 1 to be cut is pushed and cut by the flat-blade cutting blade 100, the object to be cut having a smaller dimension in the Y direction is inclined obliquely along the inclination of the tip side of the blade portion 120. May be disconnected. In order to prevent the object to be cut from being cut at an angle in this way, in the shape of the tip side of the blade portion 120, the inclination on the side in contact with the object to be cut, which has a smaller dimension in the Y direction, is the center. It may be made smaller than the inclination on the opposite side with respect to the line C. In this case, the blade portion 120 extends asymmetrically with respect to the center line C.

As shown in FIG. 2, the blade portion 120 includes a first blade portion 121, a second blade portion 122, and a third blade portion 123. The first blade portion 121 is located farthest from the base portion 110 in the extending direction (Z direction). The second blade portion 122 is located adjacent to the base portion 110 side with respect to the first blade portion 121 in the extending direction (Z direction). The third blade portion 123 is located between the second blade portion 122 and the base portion 110 in the extending direction (Z direction). The blade portion 120 may further include one or more blade portions located between the third blade portion 123 and the base portion 110 in the extending direction (Z direction).

In the longitudinal section extending in both the thickness direction (Y direction) and the extending direction (Z direction), the outer shape of the first blade portion 121 becomes thinner as the distance from the base 110 increases in the extending direction (Z direction). As described above, it has a first inclined surface 121s that is linearly inclined with respect to the center line C, and a tip portion 121t that serves as a cutting edge. In this embodiment, each of the first inclined surface 121s and the tip portion 121t is arranged symmetrically with respect to the center line C. The thickness of the first blade portion 121 is the thickest at the end on the base 110 side in the extending direction (Z direction).

In the present embodiment, in the vertical cross section, the tip portion 121t extends linearly. However, in the vertical cross section, the tip portion 121t may extend in a convex curved shape on the side opposite to the base portion 110 side.

In the present embodiment, assuming that the internal angle sandwiched between the first inclined surfaces 121s in the vertical cross section is θ1, 10 ° ≦ θ1 ≦ 30 ° is satisfied. The length of the first blade portion 121 in the extending direction (Z direction) is L1. The length of the first blade portion 121 is preferably L1 of 50 μm or more and 800 μm or less. If the length L1 of the first blade portion 121 is less than 50 μm, the thickness of the blade portion 120 becomes thin, and there is a possibility that the rigidity required for the blade portion 120 cannot be secured. When the length L1 of the first blade portion 121 is longer than 800 μm, the contact area between the first blade portion 121 and the object to be cut 1 may become large and the cutting resistance may increase.

In the vertical cross section, the outer shape of the second blade portion 122 is gently and linearly inclined with respect to the center line C from the inclination of the first inclined surface 121s, and is in contact with the first inclined surface 121s. Has. In the present embodiment, the second inclined surface 122s is arranged symmetrically with respect to the center line C.

The length of the second blade portion 122 in the extending direction (Z direction) is L2. In the extending direction (Z direction), the length L2 of the second blade portion 122 is less than the length L1 of the first blade portion 121, and is 20 μm or more and 120 μm or less.

As shown in FIG. 3, assuming that the second inclination angle formed by the line CP parallel to the center line C and the second inclined surface 122s is θ2, θ1 ≦ 25 ° and − (θ1) / 2 ≦ θ2 ≦ (θ1). ) / 2 is preferably satisfied. It is more preferable that θ1 ≦ 25 ° and − (θ1) / 4 ≦ θ2 ≦ (θ1) / 4 are satisfied. In the present embodiment, it is preferable to satisfy −6 ° ≦ θ2 ≦ 6 °.

Further, it is preferable that the surface roughness (Sa) of the second inclined surface 122s is 0.6 μm or less. For example, when the particle size of the ceramic powder used in a multilayer capacitor or the like is 1 μm or less and the surface roughness (Sa) of the second inclined surface 122s is 0.6 μm or less, the cut surface is less likely to be scratched. can do. When the surface roughness (Sa) of the second inclined surface 122s exceeds 0.6 μm, the contact area between the second inclined surface 122s and the object 1 to be cut becomes large, and the cutting resistance may increase.

As shown in FIG. 2, in the vertical cross section, the outer shape of the third blade portion 123 has a concave curved surface 123s that is concavely curved toward the center line C side and is in contact with the second inclined surface 122s. The length of the third blade portion 123 in the extending direction (Z direction) is L3.

The flat-blade cutting blade 100 according to the first embodiment of the present invention is made of a rigid cemented carbide. Specifically, it is composed of a WC-Co-based or WC-Ni-based cemented carbide. However, the material of the flat blade cutting blade 100 is not limited to cemented carbide, and may be steel depending on the object to be cut.

The flat-blade cutting blade 100 according to the first embodiment of the present invention can be formed by grinding using a grinding wheel. The radius of curvature of the concave curved surface is substantially the same as the radius of the grinding wheel.

Here, a method of measuring each dimension will be described.
The length of each blade in the extending direction (Z direction) is measured using a measuring microscope. Specifically, a 10x eyepiece and a 20x objective lens are attached to a measuring microscope (STM6-LM) manufactured by Olympus for measurement. The length of each blade in the extending direction (Z direction) is the average value of the measured values of the YZ cross sections at intervals of 10 mm in the X direction.

For each of the internal angle θ1, the second inclination angle θ2, and the radius of curvature of the concave curved surface sandwiched between the first inclined surfaces 121s, the vertical cross section is imaged using a SEM (Scanning Electron Microscope), and the captured image is obtained. Measure based on. Specifically, the vertical cross section is imaged at a high magnification using a field emission scanning electron microscope (S-4200) manufactured by Hitachi, Ltd. Each of the internal angle θ1 and the second inclination angle θ2 sandwiched between the first inclined surfaces 121s is measured using a protractor or the like based on the captured image. The radius of curvature of the concave curved surface is the radius of the approximate circle of the concave curved surface obtained by the least squares method or the like based on the captured image.

The surface roughness (Sa) of the second inclined surface 122s is measured by using a non-contact type surface roughness measuring device using a laser beam. Specifically, a non-contact three-dimensional roughness measuring device (NewView7300) manufactured by Zygo Corporation is used, and the measuring range in the vertical cross section is 0.15 mm in the X direction and 0.05 mm in the Z direction. As for the measurement field of view, the magnification of the zoom lens is 1x and the magnification of the objective lens is 50x. For the measurement correction, a robust type bandpass filter is used, and the wavelength of the lower cutoff frequency is set to 250 μm and the wavelength of the upper cutoff frequency is set to 2.5 μm.

(Experimental Example 1)
Here, Experimental Example 1 for verifying the effect of the flat-blade cutting blade according to the first embodiment of the present invention will be described.

In Experimental Example 1, push-cut cutting was performed using a flat-blade cutting blade of sample numbers 1 to 24-2, and verification was performed based on two evaluation items of the properties of the cut surface and the cutting resistance.

The material of each of the flat-blade cutting blades of sample numbers 1 to 24-2 was FM10K, a cemented carbide material manufactured by A.L.M. Co., Ltd. The outer shape of each of the flat-blade cutting blades of sample numbers 1 to 24-2 has a width of 40 mm in the X direction, a thickness of 0.4 mm in the Y direction, and a length of 20 mm in the Z direction, as shown in FIG. .. The thickness of the thinnest portion of the third blade portion having the thinnest thickness in the Y direction was set to 0.1 mm. The position of the thinnest portion of the flat-blade cutting blade in the Z direction from the cutting edge was set to 0.5 mm. The shapes of the respective blades of the flat-blade cutting blades of sample numbers 1 to 24-2 are as shown in Table 1 below.

The processing conditions for push-cut cutting are as follows. FIG. 14 is a perspective view showing a flat blade-shaped cutting blade for explaining a cutting method in an experimental example. FIG. 15 is a cross-sectional view taken along the line XV-XV in FIG.

As shown in FIGS. 14 and 15, the cutting evaluation method is to set a cutting dynamometer 9255 (hereinafter referred to as "cutting dynamometer 2003") manufactured by Kistler on the stage 2004 of the machining center V55 of Makino Milling Co., Ltd., and to have a thickness of 10 mm in order from the bottom. An acrylic plate 2002, a double-sided adhesive sheet 2001 having a thickness of 1 mm, and an object to be cut 1 are set. The object 1 to be cut is a vinyl chloride plate having a thickness of 0.5 mm, a width of 290 mm, and a length of 30 mm. The length of the flat-blade cutting blade 100 is 40 mm, and both ends 5 mm of the flat-blade cutting blade 100 are set so as not to act on the object 1 to be cut. Further, the angle formed by the tip portion 121t and the upper surface 1a of the cutting object 1 is within ± 0.05 °, and the angle θ3 between the center line C and the upper surface 1a of the cutting object 1 is 89.95 ° to 90.05 °. Set to range.

The cutting conditions were a cutting speed of 300 mm / s, a cutting interval of 12 mm, and a pushing amount of 0.55 mm. The maximum cutting load value for each push-cut cutting is defined as the cutting load value (unit: N), and the process is repeated 10 times, and the average value is defined as the average cutting load (unit: N). The cutting resistance was defined as a value (unit: N / mm) obtained by dividing the average cutting load by the length (30 mm) of the flat-blade cutting blade 100 acting on the object 1 to be cut.

As for the properties of the cut surface, the cut surface obtained by the 100th push-cut cutting was evaluated. The properties of the cut surface were evaluated by observing and observing a substantially central portion of the cut surface at a magnification of 300 to 400 times using a field emission scanning electron microscope (S-4200) manufactured by Hitachi, Ltd. As an evaluation standard, the presence or absence of unevenness on the cut surface was evaluated in three stages. Specifically, it was evaluated on a three-point scale: a uniform surface with no irregularities on the cut surface, slight irregularities on the cut surface that were not scratches, and large irregularities on the cut surface with a clear discontinuous color difference. ..

The evaluation results of each of the flat blade-shaped cutting blades of sample numbers 1 to 24-2 are as shown in Table 2 below.

FIG. 4 is an SEM observation image showing an example of the cut surface evaluated as having large irregularities (scratches) on the cut surface in Experimental Example 1. FIG. 5 is an SEM observation image showing an example of the cut surface evaluated as having slight irregularities that are not scratches on the cut surface in Experimental Example 1. FIG. 6 is an SEM observation image showing an example of a cut surface evaluated as a uniform surface in which no unevenness is observed on the cut surface in Experimental Example 1.

In FIGS. 4 to 6, the cut surface 1d at the center of the cutting object 1 in the X direction, the upper edge 1e of the cutting surface 1d in the Z direction, and the lower edge 1f of the cutting surface 1d in the Z direction are shown. It is written.

As shown in FIG. 4, in the cut surface 1d evaluated as having large irregularities which are scratches on the cut surface, the positions are unevenly located on the upper edge 1e of the cut surface 1d in the Z direction and in the cut surface 1d. Large irregularities were observed.

As shown in FIG. 5, in the cut surface 1d evaluated as having slight irregularities that are not scratches on the cut surface, slight irregularities were observed on the upper edge 1e of the cut surface 1d in the Z direction, but the cut surface was found. No unevenness was observed in 1d.

As shown in FIG. 6, in the cut surface 1d evaluated as a uniform surface in which no unevenness is observed on the cut surface, the unevenness is formed on each of the upper edge 1e of the cut surface 1d in the Z direction and the inside of the cut surface 1d. I was not able to admit.

In the sample 20 in which the second blade portion 122 was not formed as shown in Table 1, large irregularities, which were scratches, were observed on the cut surface 1d as shown in Table 2. As shown in Table 1, in each of the samples 21 to 24-2 in which the length L2 of the second blade portion 122 was larger than 120 μm, large irregularities, which were scratches, were observed on the cut surface 1d as shown in Table 2.

As shown in Table 1, in each of Samples 1 to 19-4 in which the length L2 of the second blade portion 122 is 20 μm or more and 120 μm or less, large irregularities such as scratches are observed on the cut surface 1d as shown in Table 2. I couldn't.

From this result, the outer shape of the second blade portion 122 is inclined linearly with respect to the center line C more gently than the inclination of the first inclined surface 121s, and the second inclined surface 122s is in contact with the first inclined surface 121s. The length L2 of the second blade portion 122 is less than the length L1 of the first blade portion 121, and the length L2 of the second blade portion 122 is 20 μm or more and 120 μm or less. It was confirmed that scratches can be prevented from occurring.

As shown in Table 1, in Samples 4, 8, 12, and 16 in which the surface roughness (Sa) of the second inclined surface 122s exceeds 0.6 μm, the cutting resistance is 200 N / mm as shown in Table 2. It was over. As shown in Table 1, in the samples 1 to 3, 5 to 7, 9 to 11, 13 to 15, 17 to 19-4 in which the surface roughness (Sa) of the second inclined surface 122s is 0.6 μm or less, As shown in Table 2, the cutting resistance was 200 N / mm or less.

From this result, it was confirmed that the cutting resistance can be reduced when the surface roughness (Sa) of the second inclined surface 122s is 0.6 μm or less. Further, it was confirmed that the cutting resistance can be reduced as the surface roughness (Sa) of the second inclined surface 122s is within the range of 0.05 μm or more and 0.6 μm or less, and the surface roughness (Sa) of the second inclined surface 122s is smaller. did it.

The chipping occurrence evaluation was performed by observing the cutting edge after the above-mentioned cutting test. A measuring microscope was used as a method for measuring the chipping. Specifically, a 50x eyepiece and a 20x objective lens are attached to an Olympus measuring microscope (STM6-LM), and the cutting blade (XZ surface) is placed on a flat surface. FIG. 13 is an SEM observation image showing a chipping of the cutting blade. Care should be taken so that the tip portion 121t of the cutting blade shown in FIG. 13 and the measurement stage are parallel to each other. Focus on the tip portion 121t, align the tip portions 121t located at both ends of 121k lacking the reference line in the X-axis direction of the measuring instrument, and set the measured value of Y to "0" and use it as a reference. The distance between the two points where the reference line in the X-axis direction of FIG. 13 and the end of the chip 121k intersect is defined as the width of the chip 121k. The lowest point in the Y direction of the chip 121k measured from the X axis is defined as the depth of the chip 121k. At this time, it was defined that a chipping 121k was generated at the cutting edge when either the width of 40 μm or more and the depth of 5 μm were applicable.

The cutting resistance and the number of chipped cutting edges were not evaluated for sample numbers 20 to 24-2, which were evaluated as having "large irregularities (scratches)" in the properties of the cut surface.

(Embodiment 2)
Hereinafter, the flat-blade cutting blade according to the second embodiment of the present invention will be described with reference to the drawings. The flat-blade cutting blade according to the second embodiment of the present invention is different from the flat-blade cutting blade 100 according to the first embodiment of the present invention in the outer shape of the second blade portion. The description of the configuration similar to that of the flat-blade cutting blade 100 will not be repeated.

FIG. 7 is a side view showing the outer shape of the flat-blade cutting blade according to the second embodiment of the present invention. FIG. 8 is an enlarged side view showing the VIII portion of the flat-blade cutting blade of FIG. 7. In FIG. 7, it is shown in the same side view as in FIG.

As shown in FIGS. 7 and 8, the flat blade-shaped cutting blade 200 according to the second embodiment of the present invention includes a base portion 110 and a blade portion 220. The blade portion 220 extends from the end of the base portion 110 in the extending direction (Z direction). In the present embodiment, the blade portion 220 extends symmetrically with respect to the center line C. However, the blade portion 220 may extend asymmetrically with respect to the center line C.

As shown in FIG. 7, the blade portion 220 includes a first blade portion 121, a second blade portion 222, and a third blade portion 123. The first blade portion 121 is located farthest from the base portion 110 in the extending direction (Z direction). The second blade portion 222 is located adjacent to the base portion 110 side with respect to the first blade portion 121 in the extending direction (Z direction). The third blade portion 123 is located between the second blade portion 222 and the base portion 110 in the extending direction (Z direction). The blade portion 220 may further include one or more blade portions located between the third blade portion 123 and the base portion 110 in the extending direction (Z direction).

In the vertical cross section extending in both the thickness direction (Y direction) and the extending direction (Z direction), the outer shape of the second blade portion 222 is curved in a convex shape toward the side away from the center line C and is first inclined. It has a convex curved surface 222s in contact with the surface 121s. In this embodiment, the convex curved surface 222s is arranged symmetrically with respect to the center line C.

As shown in FIG. 8, in the present embodiment, in the vertical cross section, the convex curved surface 222s is an arc of a circle Cr in contact with each of the first inclined surface 121s and the concave curved surface 123s. Therefore, the radius of curvature r of the convex curved surface 222s is the radius of the circle Cr. However, in the vertical cross section, the convex curved surface 222s is not limited to an arc, and may be a curved surface.

The length of the second blade portion 222 in the extending direction (Z direction) is L4. In the extending direction (Z direction), the length L4 of the second blade portion 222 is less than the length L1 of the first blade portion 121.

In the flat-blade cutting blade 200 according to the second embodiment of the present invention, as a method of forming the convex curved surface 222s, first, the second blade portion 222 having a corner portion is formed, and the second blade portion 222 is blasted. There are a method of rounding the corner portion of the second blade portion 222 and a method of rounding the corner portion of the second blade portion 222 by pressing and cutting the object to be cut containing the abrasive a plurality of times.

As the object to be cut containing the abrasive, for example, a solid material obtained by dispersing and mixing a hard material having a particle size of 1 μm or less with a clay material can be used. As the hard material, diamond, W, Mo, WC, Al ₂ O ₃ , TiO ₂ , TiC, TiCN, SiC, Si ₃ N ₄ , or BN can be used. When the particle size of the hard material is larger than 1 μm, the cutting edge of the flat blade cutting blade 200 may be chipped, so that the hard material is preferably fine particles. Further, in order to form the smooth convex curved surface 222s, it is preferable that the fine powder of the hard material is uniformly dispersed in the clay material.

The radius of curvature of the convex curved surface 222s is measured by imaging the vertical cross section using an SEM and based on the captured image. Specifically, the vertical cross section is imaged at a high magnification using a field emission scanning electron microscope (S-4200) manufactured by Hitachi, Ltd. The radius of curvature of the convex curved surface 222s is the radius of the approximate circle of the convex curved surface 222s obtained by the least squares method or the like based on the captured image.

(Experimental Example 2)
Here, Experimental Example 2 for verifying the effect of the flat-blade cutting blade according to the second embodiment of the present invention will be described.

In Experimental Example 2, push-cutting was performed using a flat-blade cutting blade of sample numbers 25 to 77, and the properties of the cut surface were verified.

The material of each of the flat-blade cutting blades of sample numbers 25 to 77 was FM10K, a cemented carbide material manufactured by A.L.M. Co., Ltd. The outer shape of each of the flat-blade cutting blades of sample numbers 25 to 77 has a width of 40 mm in the X direction, a thickness of 0.4 mm in the Y direction, and a length of 20 mm in the Z direction, as shown in FIG. The thickness of the thinnest portion of the third blade portion, which is the thinnest in the Y direction, was set to 0.1 mm. The position of the thinnest portion of the flat-blade cutting blade in the Z direction from the cutting edge was set to 0.5 mm. The shapes of the respective blades of the flat-blade cutting blades of sample numbers 25 to 32 are as shown in Tables 3 and 4 below.

The processing conditions for push-cut cutting are as follows.
As shown in FIGS. 14 and 15, the cutting evaluation method is to set a cutting dynamometer 9255 (hereinafter referred to as "cutting dynamometer 2003") manufactured by Kistler on the stage 2004 of the machining center V55 of Makino Milling Co., Ltd., and have a thickness of 10 mm in order from the bottom. An acrylic plate 2002, a double-sided adhesive sheet 2001 having a thickness of 1 mm, and an object to be cut 1 are set. The object 1 to be cut is a vinyl chloride plate having a thickness of 0.5 mm, a width of 290 mm, and a length of 30 mm. The length of the flat-blade cutting blade 100 is 40 mm, and both ends 5 mm of the flat-blade cutting blade 100 are set so as not to act on the object 1 to be cut. Further, the angle formed by the tip portion 121t and the upper surface 1a of the cutting object 1 is within ± 0.05 °, and the angle θ3 between the center line C and the upper surface 1a of the cutting object 1 is 89.95 ° to 90.05 °. Set to range.

The cutting conditions were a cutting speed of 300 mm / s, a cutting interval of 12 mm, and a pushing amount of 0.55 mm. The maximum cutting load value for each push-cut cutting is defined as the cutting load value (unit: N), and the process is repeated 10 times, and the average value is defined as the average cutting load (unit: N). The cutting resistance was defined as a value (unit: N / mm) obtained by dividing the average cutting load by the length (30 mm) of the flat-blade cutting blade 100 acting on the object 1 to be cut. The properties of the cut surface, cutting resistance, and chipping of the cutting edge were evaluated in the same manner as in Experimental Example 1. The evaluation results of the flat-blade cutting blades of sample numbers 25 to 77 are as shown in Tables 5 and 6 below.

As shown in Tables 5 and 6, in the sample 32 having a concave curved surface in which the outer shape of the second blade portion 222 is concavely curved toward the center line C side, large irregularities that are scratches are observed on the cut surface 1d. It was. Further, in the sample 32 in which the length L4 of the second blade portion 222 was larger than 120 μm, large irregularities, which were scratches, were observed on the cut surface 1d.

The outer shape of the second blade portion 222 is convexly curved toward the side away from the center line C and has a convex curved surface 222s that is in contact with the first inclined surface 121s and the concave curved surface 123s, and the second blade portion 222. In each of the samples 25 to 31, in which the length L4 of 222 was 20 μm or more and 120 μm or less, no large unevenness, which was a scratch, was observed on the cut surface 1d as shown in Table 3.

From this result, the outer shape of the second blade portion 222 has a convex curved surface 222s that is convexly curved toward the side away from the center line C and is in contact with the first inclined surface 121s and the concave curved surface 123s. Since the length L4 of the two blades 222 is less than the length L1 of the first blade 121 and the length L4 of the second blade 222 is 20 μm or more and 120 μm or less, the cut surface is less likely to be scratched. It was confirmed that it can be done.

For sample number 32, which was evaluated as having "large irregularities (scratches)" in the properties of the cut surface, the cutting resistance and the number of chipped cutting edges were not evaluated. For sample numbers 41 to 77, the number of chipped cutting edges was not evaluated.

(Embodiment 3)
Hereinafter, the flat-blade cutting blade according to the third embodiment of the present invention will be described with reference to the drawings. The flat-blade cutting blade according to the third embodiment of the present invention is different from the flat-blade cutting blade 100 according to the first embodiment of the present invention in the outer shape of the first blade portion. The description of the configuration similar to that of the flat-blade cutting blade 100 will not be repeated.

FIG. 9 is a side view showing the outer shape of the flat-blade cutting blade according to one aspect of the third embodiment of the present invention. FIG. 10 is a side view showing the outer shapes of the first inclined surface and the second inclined surface of the flat blade-shaped cutting blade shown in FIG. FIG. 11 is a side view showing the outer shape of the flat-blade cutting blade according to another aspect of the third embodiment of the present invention.

As shown in FIGS. 9 and 10, the first blade portion 121 of the flat blade-shaped cutting blade 100 according to one aspect of the third embodiment of the present invention has a curved first inclined surface 1121s. It is different from the flat blade cutting blade 100 of. The first inclined surface 1121s projects outward from the linear first inclined surface 121s of the first embodiment. Both ends of the second inclined surface 122s are designated as points A and B. The maximum distance from the straight line 2121s from the point B to the tip portion 121t to the curved first inclined surface 1121s is t. The slope of the straight line 2121s is the average slope of the first slope surface 1121s.

When the cutting edge has a small internal angle (θ1), the cutting resistance is reduced, but chipping is likely to occur. In order to solve this problem, it is possible to increase the thickness of the blade and suppress chipping by forming the first inclined surface 1121s having a convex bay shape. The internal angle (θ1) formed by the two first inclined surfaces 1121s refers to the angle formed by the above two straight lines 2121s at the tip portion 121t.

FIG. 11 is a side view showing the outer shape of the flat-blade cutting blade according to another aspect of the third embodiment of the present invention. FIG. 12 is a side view showing the outer shapes of the first inclined surface and the second inclined surface of the flat blade-shaped cutting blade shown in FIG.

As shown in FIGS. 11 and 12, the first blade portion 121 of the flat blade-shaped cutting blade 200 according to another aspect of the third embodiment of the present invention has a curved first inclined surface 1121s. It is different from the flat blade cutting blade 200 of. The first inclined surface 1121s projects outward from the linear first inclined surface 121s of the second embodiment. Both ends of the convex curved surface 222s are designated as points A and B. It is assumed that the convex curved surface 222s exists on an approximate circle having a radius r. The maximum distance from the straight line 2121s from the point B to the tip portion 121t to the curved first inclined surface 1121s is t. The slope of the straight line 2121s is the average slope of the first slope surface 1121s.

When the cutting edge has a small internal angle (θ1), the cutting resistance is reduced, but chipping is likely to occur. In order to solve this problem, it is possible to increase the thickness of the blade and suppress chipping by forming the first inclined surface 1121s having a convex bay shape.

(Experimental Example 3)
In Experimental Example 3, sample numbers 81 to 87 of the flat-blade cutting blade having the dimensions shown in Table 4 and sample numbers 101 to 119 of the flat-blade cutting blade having the dimensions shown in Table 7 were prepared.

The shape of the first inclined surface 1121s curved convexly toward the side away from the center line C of the first blade portion 121 is such that fine diamond or tungsten carbide particles are suspended in a liquid such as water and the suspension thereof. Is possible by adjusting the flow velocity, injection angle, and time so that the particles collide with the blade. It is more preferable to use particles having a size of 1 μm or less as the particles to be used as these abrasives. In this application, the forming method is not limited. The convex shape of the second blade portion 222 can also be manufactured by the same method. The shape of the blade of the above embodiment is formed by combining the above methods and the like.

In the shape measurement of the first inclined surface 1121s, first, the cutting blade is cut to obtain the cross section shown in FIG. 9 so that the cross section of the cutting blade can be measured. The boundary between the first blade portion 121 and the second blade portion 122 is recognized by using SEM. The distance from the tip 121t to this boundary is L1. This distance L1 can be measured in the SEM length measurement mode. The boundary is the L1 position. The distance t1 between the two boundaries is measured in the length measurement mode, a straight line is drawn from the center to the tip 121t with t1 / 2 as the center, and this straight line is defined as the center line C. A straight line is drawn from the tip portion 121t to the position of the point B, and the distance t of the farthest portion of the first inclined surface 1121s from this straight line is measured in the length measurement mode.

Cutting was performed under the same conditions as in Experimental Example 2, and the results were evaluated. The results are shown in Tables 6 and 8.

Sample numbers 81 to 87 and 101 to 119 had a small number of chipped cutting edges, and good results were obtained.

The effect of the convex first inclined surface 1121s was carried out by comparing sample numbers 25 to 31 and sample numbers 81 to 87, and comparing sample numbers 1 to 19-4 and sample numbers 101 to 119. Sample numbers 25 to 31 and sample numbers 1 to 19-4 do not have a convex bay shape on the first blade surface. On the other hand, sample numbers 81 to 87 and sample numbers 101 to 119 have a convex bay shape having a height t of 3 μm to 10 μm in FIG. The presence or absence of a chip in the total length in the blade length direction was evaluated by the number of chips, assuming that any of the width 40 μm or more and the depth 5 μm or more shown in FIG. 13 was applicable. A result was obtained in which the number of chips was small in the sample number of the first inclined surface 1121s having a relatively convex shape.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the claims rather than the above description, and it is intended to include all modifications within the meaning and scope of the claims. Further, in the above embodiment, the case where the cross-sectional shape of the flat-blade cutting blade is symmetrical with respect to the center line C has been described, but in order to obtain the effect of not causing scratches on the cut surface, the flat-blade cutting is not necessarily performed. The cross-sectional shape of the blade does not have to be symmetrical with respect to the center line C.

1 Cutting object, 1a top surface, 1d cutting surface, 1e, 1f edge, 100,200 flat blade cutting blade, 110 base, 120, 220 blade, 121 1st blade, 121k chipped, 121s, 1121s 1st inclination Surface, 121t tip, 122, 222 2nd blade, 122s 2nd inclined surface, 123 3rd blade, 123s concave curved surface, 222s convex curved surface, 2001 double-sided adhesive sheet, 2002 acrylic plate, 2003 cutting power meter , 2004 stage, 2121s straight.

Claims (6)

A flat base that extends along the center line,
A flat-blade cutting blade provided with a blade portion extending from the extending direction end of the base portion.
The blade is
The first blade portion located farthest from the base portion in the extending direction, and
A second blade portion located adjacent to the base portion side with respect to the first blade portion in the extending direction, and a second blade portion.
Including the second blade portion and the third blade portion located between the second blade portion and the base portion in the extending direction.
In a longitudinal section extending in both the thickness direction orthogonal to the extending direction and the extending direction, the outer shape of the first blade portion becomes thinner as the distance from the base portion increases in the extending direction. It has a first inclined surface that is inclined linearly with respect to the center line, and a tip that serves as a cutting edge.
In the vertical cross section, the outer shape of the second blade portion is a second inclined surface that is gently and linearly inclined with respect to the center line from the inclination of the first inclined surface and is in contact with the first inclined surface. Have and
In the vertical cross section, the outer shape of the third blade portion has a concavely curved surface that is concavely curved toward the center line and is in contact with the second inclined surface.
A flat blade-shaped cutting blade in which the length of the second blade portion is less than the length of the first blade portion and is 20 μm or more and 120 μm or less in the extending direction. A flat base that extends along the center line,
A flat-blade cutting blade provided with a blade portion extending from the extending direction end of the base portion.
The blade is
The first blade portion located farthest from the base portion in the extending direction, and
A second blade portion located adjacent to the base portion side with respect to the first blade portion in the extending direction, and a second blade portion.
Including the second blade portion and the third blade portion located between the second blade portion and the base portion in the extending direction.
In a longitudinal section extending in both the thickness direction orthogonal to the extending direction and the extending direction, the outer shape of the first blade portion becomes thinner as the distance from the base portion increases in the extending direction. It has a first inclined surface that is convexly curved toward the side away from the center line, and a tip portion that serves as a cutting edge.
In the vertical cross section, the outer shape of the second blade portion is inclined linearly with respect to the center line gently and linearly with respect to the average inclination of the first inclined surface, and is in contact with the first inclined surface. Have,
In the vertical cross section, the outer shape of the third blade portion has a concavely curved surface that is concavely curved toward the center line and is in contact with the second inclined surface.
A flat blade-shaped cutting blade in which the length of the second blade portion is less than the length of the first blade portion and is 20 μm or more and 120 μm or less in the extending direction. The flat-blade cutting blade according to claim 1 or 2, wherein the surface roughness (Sa) of the second inclined surface is 0.6 μm or less. A flat base that extends along the center line,
A flat-blade cutting blade provided with a blade portion extending from the extending direction end of the base portion.
The blade is
The first blade portion located farthest from the base portion in the extending direction, and
A second blade portion located adjacent to the base portion side with respect to the first blade portion in the extending direction, and a second blade portion.
Including the second blade portion and the third blade portion located between the second blade portion and the base portion in the extending direction.
In a longitudinal section extending in both the thickness direction orthogonal to the extending direction and the extending direction, the outer shape of the first blade portion becomes thinner as the distance from the base portion increases in the extending direction. It has a first inclined surface that is inclined with respect to the center line, and a tip that serves as a cutting edge.
In the vertical cross section, the outer shape of the second blade portion has a convex curved surface that is convexly curved toward a side away from the center line and is in contact with the first inclined surface.
In the vertical cross section, the outer shape of the third blade portion has a concavely curved surface that is concavely curved toward the center line and is in contact with the convexly curved surface.
A flat blade-shaped cutting blade in which the length of the second blade portion is less than the length of the first blade portion and is 20 μm or more and 120 μm or less in the extending direction. The flat blade-shaped cutting blade according to claim 4, wherein the shape curvature radius r of the convex curved surface of the second blade portion is 200 μm or more and 500 μm or less. The first inclined surface of the first blade portion is inclined linearly with respect to the center line in the vertical cross section, or is curved convexly toward the side away from the center line. The flat blade-shaped cutting blade according to 4 or 5.