KR20230003022A - Cemented carbide cutting blade - Google Patents

Abstract

A blade portion thickness T1 at a position of 3 μm from the blade edge toward the base portion is 0.26 μm or more and 7.00 μm or less. When the thickness of the blade portion at the position of X μm (X is an integer from 3 to 25) from the blade edge to the base portion is TX, and the thickness of the blade portion at the position of X + 1 μm from the blade edge toward the base portion is TX1, the first blade thickness The amount of change (TX1-TX) is 0.08 μm or more and 1.85 μm or less in all integers from 3 to 25 where X is 25 μm from the blade edge to the base in a longitudinal section orthogonal to the blade length direction External appearance of the blade portion It has a convex part in this outward direction, and the convex part is located outside the blade edge and the straight line S connecting the position of 25 micrometers from the blade edge toward the base part.

Description

Cemented carbide cutting blade

The present disclosure relates to a cutting blade made of cemented carbide. This application claims priority based on Japanese Patent Application No. 2020-106058 filed on June 19, 2020. All the descriptions described in this Japanese patent application are incorporated herein by reference.

Conventional cutting blades include, for example, Japanese Unexamined Patent Publication No. 10-217181 (Patent Document 1), Japanese Unexamined Patent Publication No. 2001-158016 (Patent Document 2), International Publication No. 2014/050883 (Patent Document 3), International Publication No. It is disclosed in 2014/050884 (patent document 4), Unexamined-Japanese-Patent No. 2017-42911 (patent document 5), and Unexamined-Japanese-Patent No. 2004-17444 (patent document 6).

Patent Document 1: Japanese Unexamined Patent Publication No. 10-217181 Patent Document 2: Japanese Unexamined Patent Publication No. 2001-158016 Patent Document 3: International Publication No. 2014/050883 Patent Document 4: International Publication No. 2014/050884 Patent Document 5: Japanese Unexamined Patent Publication No. 2017-42911 Patent Document 6: Japanese Unexamined Patent Publication No. 2004-17444

The cemented carbide cutting blade of the present disclosure includes a base portion and a blade portion installed on an extension line of the base portion and having a shape in which the thickness becomes thinner toward the blade edge, which is the most distal end, at a position of 3 μm from the blade edge toward the base portion The thickness of the blade part is 0.26 ㎛ or more and 7.00 ㎛ or less, and the thickness of the blade part at the position of X ㎛ (X is an integer from 3 to 25) from the blade edge toward the base part is TX, and the blade at the position of X + 1 ㎛ from the blade edge toward the base part When the sub-thickness is TX1, the first blade thickness change amount (TX1-TX) is 0.08 μm or more and 1.85 μm or less in all integers from 3 to 25, and at the blade edge in a longitudinal section orthogonal to the blade longitudinal direction In the range of 25 μm toward the base portion, the outline of the blade portion has a convex portion outward, and the convex portion is located outside the blade edge and a straight line connecting the position of 25 μm from the blade edge toward the base portion.

[Fig. 1] Fig. 1 is a longitudinal sectional view of a cutting blade 1 made of cemented carbide according to Embodiment 1.
[Fig. 2] Fig. 2 is a longitudinal sectional view of a cutting blade 1 made of cemented carbide according to the second embodiment.
[Fig. 3] Fig. 3 is a longitudinal sectional view of a cutting blade 1 made of cemented carbide according to a third embodiment.
[Fig. 4] Fig. 4 is a longitudinal sectional view of a cutting blade 1 made of cemented carbide according to the fourth embodiment.
[Fig. 5] Fig. 5 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to the fifth embodiment.
[Fig. 6] Fig. 6 is a longitudinal sectional view of a cutting blade 1 made of cemented carbide according to the sixth embodiment.
[Fig. 7] Fig. 7 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to a seventh embodiment.
[Fig. 8] Fig. 8 is a longitudinal sectional view of a cutting blade 1 made of cemented carbide according to the eighth embodiment.
[Fig. 9] Fig. 9 is a longitudinal sectional view of a cemented carbide cutting blade 1 according to a ninth embodiment.
[Fig. 10] Fig. 10 is a perspective view of an apparatus for explaining a cutting test.
[Fig. 11] Fig. 11 is a cross-sectional view along line XI-XI in Fig. 10;
[Fig. 12] Fig. 12 is a microscope observation picture (microscopic) observation image showing the defect of the cutting blade.

[Problems to be solved by the present disclosure]

If the blade thickness is thin, there is a problem that the blade edge cannot withstand the cutting impact and chipping occurs. When the blade thickness is thick, there was a problem that the cutting resistance was high, the cross section quality was deteriorated, and the cross section became rough.

[Description of Embodiments of the Present Disclosure]

Embodiments of the present disclosure are first opened and described.

[Details of Embodiments of the Present Disclosure]

(material)

The material used for the cutting blade is cemented carbide with tungsten carbide and cobalt as main components. The content of cobalt used in cemented carbide is in the range of 3 to 25% by mass. The cobalt content is preferably in the range of 5 to 20% by mass.

The hardness of cemented carbide ranges from 82 to 95 in HRA (Rockwell Hardness). The composition of the elements constituting the cemented carbide is specified by ICP emission spectrometry and Co titration. In the cemented carbide in the present disclosure, the main components are tungsten carbide and cobalt. In addition, elements such as chromium, vanadium, tantalum, and niobium may be included in order to adjust characteristics such as particle size.

It is preferable that the size of the tungsten carbide crystals in the cemented carbide is 0.1 μm to 4 μm. It is more preferable that the crystal size is 2 μm or less.

In addition, in order to control the crystal grains of tungsten carbide, it may contain a compound containing tantalum as a main component for suppressing the growth of crystal grains. It is preferable that the content rate is 0.1-2 mass %. The additive for suppressing crystal grain growth may be a compound containing vanadium as a main component or a compound containing chromium as a main component. The content of each of the compound containing tantalum as a main component, the compound containing vanadium as a main component, and the compound containing chromium as a main component is 0.1 to 2% by mass.

(shape)

The shape of the cutting blade is basically a rectangular plate shape. The thickness is the shortest side of the plate.

A cutting blade made of cemented carbide has a base portion and a blade portion provided on an extension of the base portion and having a shape in which the thickness decreases toward the blade edge, which is the most distal end portion.

It is preferable that the thickness of the base portion is constant. The base portion has a thickness of 50 to 6000 μm, and the required thickness varies according to the size of the cut object to be cut. Also, the blade portion for cutting is formed on one side extending from the base portion. The size of the blade portion in the direction from the base portion to the blade portion is expressed as the width (Z-axis direction) of the blade portion. The length in the longitudinal direction of the blade (X-axis direction) and the dimension in the direction perpendicular to the blade width direction are expressed as the blade thickness (Y-axis direction).

In many cases used as a cutting blade, the length in the longitudinal direction of the blade is often used in the range of 30 mm to 500 mm, and the width is often used in the range of 10 to 30 mm.

The thickness of the blade portion at a position of 3 μm from the blade edge toward the base portion is 0.26 μm or more and 7.00 μm or less. If the thickness of the blade portion at this position is less than 0.26 [mu]m, it becomes difficult to maintain the strength of the blade portion. Or it is too thin and becomes unmanufacturable. When the thickness of the blade portion at this position exceeds 7.00 μm, the cutting resistance increases.

When the thickness of the blade portion at the position of X μm (X is an integer from 3 to 25) from the blade edge to the base portion is TX, and the thickness of the blade portion at the position of X + 1 μm from the blade edge toward the base portion is TX1, the first blade thickness The amount of change (TX1-TX) is 0.08 μm or more and 1.85 μm or less for all integers in which X is 3 to 25. If the blade thickness change amount is less than 0.08 μm, sufficient strength of the blade portion is not obtained and is lost. When the blade thickness variation exceeds 1.85 μm, the cutting resistance increases.

In the longitudinal section orthogonal to the longitudinal direction of the blade, the outer shape of the blade portion has a convex portion outward in the range of 25 μm from the blade edge toward the base portion, and the convex portion has a blade edge and a straight line connecting the 25 μm position from the blade edge toward the base portion. located outside Due to the existence of the convex portion, the strength of the blade portion can be increased compared to a straight cutting blade having no convex portion.

(Embodiment 1)

1 is a longitudinal sectional view of a cutting blade 1 made of cemented carbide according to Embodiment 1. As shown in Fig. 1, the cemented carbide cutting blade 1 has a blade edge 121t extending in the blade longitudinal direction. 1 is a cross section in a direction orthogonal to the blade longitudinal direction.

The cemented carbide cutting blade 1 has a base portion 110 and a blade portion 120 connected to the base portion 110 . The blade unit 120 has a first part 121 . The frontmost part of the first part 121 is the blade edge 121t.

The thickness (Y-axis direction) of the blade portion 120 gradually decreases from the base portion 110 toward the blade edge 121t. The thickness at the point 203 where the dimension in the longitudinal direction (Z-axis direction) from the blade edge 121t is 3 μm is T1. The thickness at the point 225 where the longitudinal dimension from the blade edge 121t is 25 μm is T2. The thickness at the point 20X where the longitudinal dimension from the blade edge 121t is X μm is TX. The thickness at the point 20X1 where the longitudinal dimension from the blade edge 121t is X+1 μm is TX1.

The convex 120t is located outside the straight line S connecting the point 225 and the blade edge 121t. The convex 120t is formed on the outer surface 121s. A straight line 325 is drawn on the outer surface 121s at the point 225, and the angle formed by the two straight lines 325 is θ. The slope of the straight line 325 is 1/2 of the blade thickness variation at the point 225. A direction orthogonal to the Y-axis and Z-axis directions is the blade length direction.

The outer surface 121s has a curved shape. The angle formed by the tangent on the outer surface 121s increases as it approaches the blade edge 121t. In this embodiment, the outer surface 121s is left-right symmetric with respect to the center line C. However, the outer surface 121s may be left and right asymmetrical with respect to the center line C.

The outer surface 121s is gently curved to connect the blade edge 121t and the base portion 110. As the blade edge 121t approaches, the angle between the outer surface 121s and the center line C increases. Among the blade portions 120, only the range of 3 to 25 μm is curved in the Z-axis direction, and the base portion 110 side may be straight rather than the curved portion.

Objects to be cut by the cutting blade 1 made of cemented carbide are, for example, ceramics or glass before firing, such as multilayer capacitors or multilayer inductors, metal green sheets, metal foils, paper, fibers or hard resins.

The cemented carbide cutting blade 1 is installed on the base portion 110 and the extension of the base portion 110, and toward the blade edge 121t, which is the most distal end, The blade portion 120 having a shape in which the thickness becomes thinner to provide In all the following embodiments, the following relationships (1), (2) and (3) are established.

(1) The thickness T1 of the blade portion 120 at a position of 3 μm from the blade edge 121t toward the base portion 110 is 0.26 μm or more and 7.00 μm or less.

(2) From the blade edge 121t toward the base portion 110, the thickness of the blade portion at the position of X μm (X is an integer from 3 to 25) is TX, and from the blade edge 121t toward the base portion 110, X+ When the thickness of the blade portion 120 at the position of 1 μm is TX1, the first blade thickness variation (TX1-TX) is 0.08 μm or more and 1.85 μm or less for all integers from 3 to 25 where X is.

(3) In the longitudinal section orthogonal to the blade length direction, the blade portion 120 has a convex 120t portion in the outward direction in the range of 25 μm from the blade edge 121t toward the base portion 110, The convex portion 120t is located outside the blade edge 121t and the straight line S connecting the 25 μm position from the blade edge 121t toward the base portion 110.

More preferably, when X is 3, the amount of change in the thickness of the first blade is 0.26 μm or more and 0.93 μm or less.

(Embodiment 2)

Fig. 2 is a longitudinal sectional view of a cutting blade 1 made of cemented carbide according to Embodiment 2. As shown in FIG. 2 , in the cemented carbide cutting blade 1 according to the second embodiment, the outer surfaces 121s, 122s, and 123s are stepped, so that the outer surface 121s is curved. It is different from the cemented carbide cutting blade 1 according to the first embodiment. The outer surfaces 121s, 122s, and 123s of the three-stage blade unit 120 are all straight. The angle formed by the outer surfaces 121s, 122s, and 123s with respect to the center line C is greatest at the outer surface 121s close to the blade edge 121t, and at the outer surface 123s close to the base portion 110. the smallest in

A point 225 at a distance of 25 μm from the blade edge 121t in the Z-axis direction is present in the first portion 121 . In this embodiment, although the convex 120t has an angular shape, the convex 120t may have a curved shape.

(Embodiment 3)

3 is a longitudinal sectional view of a cutting blade 1 made of cemented carbide according to Embodiment 3; As shown in Fig. 3, in the cemented carbide cutting blade 1 according to Embodiment 3, since the outer surfaces 121s and 122s are two-stepped, the outer surfaces 121s, 122s, and 123s are three-stepped. It is different from the cemented carbide cutting blade 1 according to Embodiment 2.

The blade part 120 has a first part 121 and a second part 122 from the front end side. The outer surface 121s has a convex 120t. The convex 120t is located outside the straight line S. The angle formed by the outer surfaces 121s and 122s with respect to the center line C is largest at the outer surface 121s close to the blade edge 121t and largest at the outer surface 122s close to the base 110. small.

(Embodiment 4)

4 is a longitudinal sectional view of the cutting blade 1 made of cemented carbide according to the fourth embodiment. As shown in Fig. 4, in the cemented carbide cutting blade 1 according to the fourth embodiment, since the outer surface 122s is concave, the outer surface 122s is straight. It is different from the cemented carbide cutting blade 1 according to 3. A point 225 at a distance of 25 μm from the blade edge 121t in the Z-axis direction is present in the first portion 121 .

The blade part 120 has a first part 121 and a second part 122 from the front end side. A convex 120t exists in the first part 121 . The convex 120t is located outside the straight line S.

The outer surface 122s of the second part 122 of the blade unit 120 is curved so that the angle formed with the center line C decreases as it approaches the blade edge 121t.

(Embodiment 5)

5 is a longitudinal sectional view of a cutting blade 1 made of cemented carbide according to Embodiment 5; As shown in Fig. 5, the cemented carbide cutting blade 1 according to the fifth embodiment is different from the cemented carbide cutting blade 1 according to the first embodiment in that the blade edge 121t has a flat shape. The flat surface constituting the blade edge 121t may be perpendicular to the center line C or inclined with respect to the center line C.

(Embodiment 6)

Fig. 6 is a longitudinal sectional view of the cemented carbide cutting blade 1 according to the sixth embodiment. As shown in Fig. 6, in the cemented carbide cutting blade 1 according to Embodiment 6, since the blade edge 121t is rounded, the blade edge 121t is sharp. The cemented carbide cutting blade according to Embodiment 1 It is different from (1). The radius of curvature of the blade edge 121t may be single, or a plurality of radii of curvature of the blade edge 121t may exist to form a so-called complex R shape.

(Embodiment 7)

Fig. 7 is a longitudinal sectional view of the cemented carbide cutting blade 1 according to the seventh embodiment. As shown in Fig. 7, in the cemented carbide cutting blade 1 according to the seventh embodiment, in the first portion 121 near the blade edge 121t, the outer surface 121s has an outwardly convex shape, and the blade edge ( In the second part 122 away from 121t, the outer surface 122s has a concave shape. A point 225 at a distance of 25 μm from the blade edge 121t in the Z-axis direction is present in the first portion 121 .

(Embodiment 8)

Fig. 8 is a longitudinal sectional view of the cemented carbide cutting blade 1 according to the eighth embodiment. As shown in FIG. 8, in the cemented carbide cutting blade 1 according to the eighth embodiment, from the blade edge 121t toward the base portion 110, Y μm (Y is an integer from 26 to 100) at the point (20Y ) When the thickness of the blade portion at the position of TY and the thickness of the blade portion 120 at the position of the point (20Y1) of Y + 1 μm from the blade edge 121t toward the base portion 110 is TY1, the second blade The amount of change in thickness (TY1-TY) is 0.01 µm or more and 1.85 µm or less for all integers from 26 to 100 in Y.

The thickness of the blade portion 120 at the point 226 at which the distance in the Z-axis direction is 26 μm from the blade edge 121t is T11. The thickness of the blade portion 120 at the point 2100 at which the distance in the Z-axis direction from the blade edge 121t is 100 μm is defined as T12.

In the longitudinal section orthogonal to the longitudinal direction of the blade, in the range of 100 μm from the blade edge 121t, the outer shape of the blade portion 120 has a convex (120t) portion in the outward direction, and the convex (120t) portion has a blade edge (121t) ) and a straight line S connecting the position of 100 μm from the blade edge 121t.

(Embodiment 9)

Fig. 9 is a longitudinal sectional view of the cemented carbide cutting blade 1 according to the ninth embodiment. As shown in FIG. 9 , in the cemented carbide cutting blade 1 according to the ninth embodiment, the point (20Z When the thickness of the blade portion at the position of TZ and the thickness of the blade portion 120 at the point 20Z1 at the Z + 1 μm position from the blade edge 121t toward the base portion 110 is TZ1, the third blade thickness The amount of change (TZ1-TZ) is 0.01 μm or more and 1.85 μm or less for all Z integers from 101 to 3000.

The thickness of the blade portion 120 at a point 2101 at which the distance in the Z-axis direction from the blade edge 121t is 101 μm is defined as T21. The thickness of the blade portion 120 at the point 2300 at which the distance in the Z-axis direction from the blade edge 121t is 3000 μm is defined as T22.

In the longitudinal section orthogonal to the longitudinal direction of the blade, in the range of 100 μm from the blade edge 121t, the outer shape of the blade portion 120 has a convex (120t) portion in the outward direction, and the convex (120t) portion has a blade edge (121t) ) and a straight line S connecting the position of 3000 μm from the blade edge 121t.

(Example 1)

A cemented carbide cutting blade 1 having a base portion 110 having a thickness of 100 μm, a width of 20 mm, and a length of 40 mm in the longitudinal direction of the blade was used and its characteristics were confirmed.

<Material>

The sintered body used for the cutting blade is a cemented carbide whose main components are tungsten carbide and cobalt. The content of cobalt used in cemented carbide is 10% by mass. The hardness of cemented carbide is 92 in terms of HRA (Rockwell Hardness).

<Polishing>

The manufactured sintered body was cut into a plate shape having a thickness of 100 μm, a width of 20 mm, and a length of 40 mm by a grinding machine using a diamond grindstone, and was used as a material for processing the tip blade part.

< sharpen the blade >

Then, using the above material, forming and processing of the tip blade portion was performed. In the forming process, processing was performed by fixing the material to a dedicated work rest with adjustable angles using a dedicated grinding machine using a diamond cylindrical grindstone. In the case of a two-stage blade unit, processing is performed on a first blade unit having a tip angle at the most distal end with respect to one side in the direction of 40 mm in length of the long side of the material; In the second blade portion, blade portions having different tip angles were formed on both surfaces.

<Forming the outer surface of a convex curve>

In order to form the outer surface 121s which is a convex curved surface as shown in FIG. 1, convex shape processing was given to both surfaces with respect to the most tip part using the cylindrical grindstone which has a concave curved surface. In forming a convex shape, since it is a very precise machining, it is very important to set grinding conditions such as the amount of cut and the angle of the work rest.

<Plane external surface molding>

In order to form the flat outer surface 121s as shown in Fig. 3, convex processing was applied to both surfaces of the most distal end using a cylindrical grindstone. In the case of a three-stage blade as shown in FIG. 2, the third portion 123 is formed at the point of sharpening.

<Forming the outer surface of a concave curve>

In order to form the outer surface 122s which is a concave curved surface as shown in FIG. 4, concave processing was applied to both surfaces with respect to the most tip part using the cylindrical grindstone which has a convex curved surface.

<Confirm cross section>

Section confirmation was performed using a Schottky Field Emission Scanning Electron Microscope JSM-7900F manufactured by Nippon Electronics Co., Ltd., and images were taken at 3,000 times magnification, and 3, 4, 5, 6, ... · The blade thickness (thickness of the blade portion 120) of the 26 μm portion was measured. The blade thickness variation was calculated from the blade thickness. These results are shown in Tables 1-5.

In Table 1 and the like, "25 μm angle [°]" is 2 at a point 225 on the outer surface 121s 25 μm away from the blade edge 121t in the Z-axis direction in the longitudinal section shown in FIG. 1 and the like. It refers to an angle formed by two straight lines 325 by drawing a straight line 325 from the dog's outer surface 121s. The slope of the straight line 325 is 1/2 of the change in blade thickness at the point 225. "3 μm angle [°]" means two outer surfaces at points 203 on the outer surface 121s 3 μm away from the blade edge 121t in the Z-axis direction in the longitudinal section shown in FIG. 1 and the like ( 121s), and refers to the angle formed by the two straight lines. The slope of the two straight lines is the blade thickness variation at point 203. "N" in the column of "outside convexity" means that there is no convexity 120t protruding outward from the straight line S on the outer surface 121s. "Y" in the "outside convex" column means that a convex 120t protruding outward from the straight line S exists on the outer surface 121s. In the “change in blade thickness [μm]”, “3 μm” is a value obtained by subtracting the blade thickness at 3 μm from the blade edge 121t from the blade thickness at 4 μm from the blade edge 121t. "25 μm" is a value obtained by subtracting the blade thickness at 25 μm from the blade edge 121t from the blade thickness at 26 μm from the blade edge 121t. "Drawing" shows a drawing corresponding to the shape of each sample. "max/min" represents the maximum value and minimum value of the blade thickness variation in the outer surface 121s in the range of 3 μm to 25 μm away from the blade edge 121t in the Z-axis direction.

<Cut test>

In addition, in order to confirm the effect using the cemented carbide cutting blade prepared here, a commercially available polyvinyl chloride board was pressed and cut, and the cross-section cutting quality such as deformation and defects and defects occurring in the cutting blade (subsequent chipping) By observing, the effect of the cemented carbide cutting blade was confirmed. 10 is a perspective view of an apparatus for explaining a cutting test. Fig. 11 is a cross-sectional view along line XI-XI in Fig. 10; As shown in Figs. 10 and 11, the cemented carbide cutting blade 1 was held by chucks 3001 and 3002.

Conditions of this test (FIGS. 10 and 11)

Work material: polyvinyl chloride plate (100), thickness 0.5 mm, width 290 mm, length 30 mm

Test device: Machining center V55 (Stage (2004)) manufactured by Makino Price Seisakusho, with cutting dynamometer 9255 (cutting dynamometer (2003)) manufactured by Kisla set

Work set: An acrylic plate 2002 with a thickness of 10 mm, a double-sided adhesive sheet 2001 with a thickness of 1 mm, and a vinyl chloride plate 100 as a work were laminated from the bottom.

Cutting conditions: cutting speed 300 mm/s, press-in amount 0.55 mm, longitudinal workpiece and blade angle ±0.5°, workpiece and blade section angle 90°±0.5°, number of cuts 100 times, cutting interval (pitch) 2.5 mm

Matters to be checked: chipping (more than 5 ㎛ in depth and more than 10 ㎛ in width), section quality (section state due to chipping, section roughness)

The results of repeating the cutting test for each sample number are shown in Tables 1 to 5.

Regarding chipping, the number of chips (more than 5 μm in depth and more than 10 μm in width) is counted, and if the number of chippings is 0 to 3, the evaluation is A, if 4 to 10, the evaluation is B, and 11 or more This side evaluation was made C.

The fracture occurrence evaluation was evaluated by observing the blade edge after the above-mentioned cutting test. In the defect measurement method, a measuring microscope was used. Specifically, a 50x eyepiece and a 20x objective lens were attached to a measuring microscope (STM6-LM) manufactured by Olympus, and a cutting blade (XZ plane) was placed on a flat surface. Fig. 12 is a microscope observation photograph (microscopic) observation image showing a defect in the cutting blade. Note that the blade edge 121t of the cutting blade in Fig. 12 and the measurement stage are parallel. Focus on the blade edge 121t, align the blade edges 121t located at both ends of the defect 121k with the reference line in the X-axis direction of the measuring instrument, and set the measured value of Y as "0" as a reference. The width of the defect 121k is the distance between two points where the reference line in the X-axis direction of FIG. 12 and the end of the defect 121k intersect. Measured from the X axis, the lowest point in the Y direction of the defect 121k is the depth of the defect 121k. At this time, it was defined that a defect 121k occurred in the blade edge when either of the width was 10 μm or more and the depth was 5 μm or more.

Regarding the cross-section state due to chipping, the evaluation was A when there was no scratch, B when there was a scratch but acceptable (wound length 10 μm or less), and scratched and unacceptable. (wound length exceeding 10 μm) was evaluated as C. The length of the wound was measured by taking an image at a magnification of 3,000 using a Schottky field emission scanning electron microscope JSM-7900F manufactured by Nippon Electronics Co., Ltd.

Regarding the cross section roughness, if the surface roughness (Sa) of the cross section (arithmetic mean height ISO25178) is 0.05 μm or less, the evaluation is A, and if the surface roughness (Sa) of the cross section is greater than 0.05 μm and less than or equal to 0.15 μm, the evaluation is B. And, when the surface roughness (Sa) exceeded 0.15 μm, the evaluation was made C. Surface roughness (Sa) is measured using a non-contact surface roughness measuring device using a white interferometer. Specifically, it was measured using a non-contact three-dimensional roughness measuring device (Nexview (registered trademark)) manufactured by Zygo Corporation.

Regarding the cross-section quality, the evaluation of the cross-section quality was set as A when the evaluation was A in both the state of the cross-section and the roughness of the cross-section due to chipping. The evaluation of the cross-section quality was set to C when the evaluation was C in any of the cross-section state and cross-section roughness caused by chipping. The evaluation other than that was set as B.

Regarding the overall evaluation, if the evaluation was A in both chipping and section quality, the overall evaluation was set as A. If the evaluation in either of the chipping and section quality was C or unmanufacturable, the overall evaluation was given as C. The evaluation other than that was set as B.

As shown in Tables 1 to 5, the thickness of the blade portion at the 3 μm position is 0.26 μm or more and 7.00 μm or less, the amount of change in blade thickness from 3 μm to 25 μm is 0.08 μm or more and 1.85 μm or less, and the convex (120t) If there exists, it can be seen that the overall evaluation becomes A or B.

Furthermore, when the variation in blade thickness at the 3 μm position (X = 3 μm) is 0.26 μm or more and 0.93 μm or less, the overall evaluation becomes A, indicating that it is more preferable.

(Example 2)

Cutting blades (sample numbers 97-100, 109-112, 121-124, and 133-136) having shapes shown in FIGS. 1, 2, 4, and 7 were manufactured. The cutting blades were produced by performing the following additional processing on the distal end of these cutting blades and the cutting blades manufactured in Example 1 described above. The cutting blade was fixed on the fixing table and processed so that the angle of the tip was perpendicular to the base portion 110 using a diamond flat stone having a particle size of #10000. The cross section confirmation method was the same as in Example 1. Thus, cemented carbide cutting blades of Sample Nos. 89-92, 101-104, 113-116, 125-128, and 137-140 were produced.

Using the same material as in Example 1, groove processing of R 0.25 μm was performed on a grindstone having a grain size of #10000, and R processing was performed on the tip end of the cutting blade using the groove. Alternatively, R processing was performed by suspending minute diamond or tungsten carbide particles (less than 1 μm) in a liquid such as water, and colliding the suspension against a blade by adjusting the flow rate, injection angle, and time. The cross section confirmation method was the same as in Example 1. Thus, cutting blades made of cemented carbide of Sample Nos. 93-96, 105-108, 117-120, 129-132, and 141-144 were prepared. These details are shown in Tables 6 to 10.

The cemented carbide cutting blades in Tables 6 to 10 were evaluated in the same manner as in Example 1. The results are shown in Tables 6 to 10.

In the "drawings" of Table 6 or the like, "3, 5" indicates that the blade edge 121t was made flat as shown in FIG. 5 in the cemented carbide cutting blade 1 of FIG. 3 . "1,5", "2,5", "4,5", and "7,5" are similarly shown in Fig. 5 in the cemented carbide cutting blade 1 of Figs. 1, 2, 4, 7 blade edge ( 121t) is flat.

"3, 6" indicates that the blade edge 121t was rounded as shown in FIG. 6 in the cutting blade 1 made of cemented carbide in FIG. 3 . "1,6", "2,6", "4,6", "7,6" are likewise shown in Fig. 6 in the cemented carbide cutting blade 1 of Figs. 1, 2, 4, 7 blade edge ( 121t) is rounded. In Tables 6 to 10, it can be seen that the same tendency as in Tables 1 to 5 appears.

(Example 3)

Cutting blades (sample numbers 145-160) having the shape shown in FIG. 8 were manufactured. The thickness of the base portion 110 was 100 μm to 400 μm. Other material sizes, sharpening, and outer surface formation were in accordance with Example 1. As in Example 2, the most distal end of these cutting blades was processed so that the distal end angle was perpendicular to the base portion 110. The cross section confirmation method was the same as in Example 1. Thus, cemented carbide cutting blades of Sample Nos. 161 to 176 were prepared. Further, as in Example 2, R processing was applied to the most distal end. The cross section confirmation method was the same as in Example 1. At this time, the photographing magnification of the Schottky Electrolytic Emission Scanning Electron Microscope was set to a magnification capable of observing a cross section in one field of view. Also, it can be substituted with a microscope with a length measurement function. Thus, cutting blades made of cemented carbide of Sample No. 177-192 were prepared. These details are shown in Tables 11 to 13.

The cemented carbide cutting blades in Tables 11 to 13 were evaluated in the same manner as in Example 1. The results are shown in Tables 11 to 13.

In Tables 11 to 13, it can be seen that the same trends as in Tables 1 to 6 appeared.

(Example 4)

Cutting blades (sample numbers 193-208) having shapes shown in FIG. 9 were manufactured. The thickness of the base portion 110 was 100 μm to 6000 μm. Other material sizes, sharpening, and outer surface formation were in accordance with Example 1. As in Example 2, the most distal end of these cutting blades was processed so that the distal end angle was perpendicular to the base portion 110. The cross section confirmation method was the same as in Example 1. Thus, cutting blades made of cemented carbide of Sample No. 209-224 were prepared. Further, as in Example 2, R processing was applied to the most distal end. The cross section confirmation method was the same as in Example 3. Thus, cemented carbide cutting blades of Sample Nos. 225-240 were prepared. These details are shown in Tables 14 to 16.

The cemented carbide cutting blades in Tables 14 to 16 were evaluated in the same manner as in Example 1. The results are shown in Tables 14 to 16.

In Tables 14 to 16, it can be seen that the same trends as Tables 1 to 6 appeared.

In addition, "8, 5" in the "drawing" of Table 12 etc. shows what made the blade edge 121t flat like FIG. 5 in the cemented carbide cutting blade 1 of FIG. 8. As shown in FIG. "9, 5" also shows that the blade edge 121t was made flat like FIG. 5 in the cemented carbide cutting blade 1 of FIG. 9 similarly.

"8, 6" indicates that the blade edge 121t was rounded as shown in FIG. 6 in the cutting blade 1 made of cemented carbide in FIG. 8 . "9, 6" also shows that the blade edge 121t was rounded like FIG. 6 in the cemented carbide cutting blade 1 of FIG. 9 similarly.

It should be considered that the embodiments and examples disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

1: alloy cutting blade, 100: polyvinyl chloride plate, 110: base part, 120: blade part, 120t: convex, 121: first part, 121k: defect, 121s, 122s, 123s: outer surface, 121t: blade edge , 122: second part, 203, 225: point, 325: tangent line, 2001: double-sided adhesive sheet, 2002: acrylic plate, 2003: cutting dynamometer, 2004: stage, 3001, 3002: chuck.

Claims (4)

As a cutting blade made of cemented carbide,
base part,
A blade part installed on the extension line of the base part and having a shape in which the thickness becomes thinner toward the blade edge, which is the most distal end part
to provide,
The thickness of the blade portion at a position of 3 μm from the blade edge toward the base portion is 0.26 μm or more and 7.00 μm or less,
The thickness of the blade portion at the position of X μm (X is an integer from 3 to 25) from the blade edge to the base portion is TX, and the thickness of the blade portion at the position of X + 1 μm from the blade edge to the base portion is TX1 When, the first blade thickness variation (TX1-TX) is 0.08 μm or more and 1.85 μm or less for all integers from 3 to 25,
In the longitudinal section orthogonal to the blade longitudinal direction, the outer shape of the blade portion has a convex portion in an outward direction in the range of 25 μm from the blade edge toward the base portion, and the convex portion extends from the blade edge and the blade edge to the base portion A cutting blade made of cemented carbide which is located outside the straight line connecting the positions of 25 μm toward the direction. The cemented carbide cutting blade according to claim 1, wherein the first blade thickness variation (TX1-TX) when X is 3 is 0.26 μm or more and 0.93 μm or less. The method of claim 1 or 2, wherein the thickness of the blade portion at Y μm (Y is an integer from 26 to 100) from the blade edge toward the base portion is TY, and Y + 1 μm from the blade edge toward the base portion When the thickness of the blade portion at the position is TY1, the second blade thickness variation (TY1-TY) is 0.01 μm or more and 1.85 μm or less in all integers where Y is 26 to 100. A cutting blade made of cemented carbide. The method according to any one of claims 1 to 3, wherein the thickness of the blade portion at Z μm (Z is an integer from 101 to 3000) from the blade edge toward the base portion is TZ, from the blade edge toward the base portion When the thickness of the blade portion at the Z + 1 μm position is TZ1, the third blade thickness change amount (TZ1-TZ) is 0.01 μm or more and 1.85 μm or less in all integers from 101 to 3000 where Z is a cemented carbide cutting blade.

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