WO2023176819A1 - Cutting blade made of super-hard alloy - Google Patents

Cutting blade made of super-hard alloy Download PDF

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Publication number
WO2023176819A1
WO2023176819A1 PCT/JP2023/009816 JP2023009816W WO2023176819A1 WO 2023176819 A1 WO2023176819 A1 WO 2023176819A1 JP 2023009816 W JP2023009816 W JP 2023009816W WO 2023176819 A1 WO2023176819 A1 WO 2023176819A1
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Prior art keywords
cutting
blade
cemented carbide
cutting blade
less
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PCT/JP2023/009816
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French (fr)
Japanese (ja)
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WO2023176819A9 (en
Inventor
篤史 小林
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株式会社アライドマテリアル
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Application filed by 株式会社アライドマテリアル filed Critical 株式会社アライドマテリアル
Priority to KR1020247021228A priority Critical patent/KR20240113817A/en
Priority to CN202380024921.9A priority patent/CN118804826A/en
Priority to JP2023559064A priority patent/JPWO2023176819A1/ja
Publication of WO2023176819A1 publication Critical patent/WO2023176819A1/en
Publication of WO2023176819A9 publication Critical patent/WO2023176819A9/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D35/00—Tools for shearing machines or shearing devices; Holders or chucks for shearing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
    • B26D1/06—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
    • B26D1/06—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates
    • B26D1/08—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates of the guillotine type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/002—Materials or surface treatments therefor, e.g. composite materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0053—Cutting members therefor having a special cutting edge section or blade section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/006—Cutting members therefor the cutting blade having a special shape, e.g. a special outline, serrations

Definitions

  • the present disclosure relates to a cutting blade made of cemented carbide.
  • This application claims priority based on Japanese Patent Application No. 2022-043430, which is a Japanese patent application filed on March 18, 2022. All contents described in the Japanese patent application are incorporated herein by reference.
  • the cemented carbide cutting blade includes a base and a blade part that is provided on an extension of the base and has a cutting edge that is the cutting edge, and is a distortion of the WC particles that constitute the left and right blade surfaces that form the cutting edge.
  • the KAM value is 0 or more and 4.0 or less.
  • FIG. 1 is a front view of a cutting blade 1 made of cemented carbide.
  • FIG. 2 is a perspective view of the cutting blade 1 made of cemented carbide.
  • FIG. 3 is a perspective view of the two-stage cemented carbide cutting blade 1.
  • FIG. 4 is a front view of the cemented carbide cutting blade 1 shown for explaining the cutting method.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 10-217181 discloses a flat cutting blade for cutting thin plate-like workpieces such as ceramic green sheets, which secures a narrow cutting edge angle that enables high-precision cutting.
  • the present invention discloses a flat cutting blade that has high buckling strength.
  • a solution to this problem is to form the cutting edge with a flat or concave curved surface that is symmetrical with respect to the center line Y, and to connect the cutting edge and the base with one or more reinforcing parts of the symmetrical concave curved surface. It is proposed to shorten the distance of the cutting section to ensure high-precision cutting while increasing buckling strength.
  • Patent Document 2 International Publication No. 2014-050884 discloses a base on a flat plate, left and right blade surfaces that are inclined to approach each other from both sides of the base, and a convex curved surface formed to connect the left and right blade surfaces.
  • the short distance between the intersection of two straight lines along the left and right blade surfaces and the tip of the cutting edge is 1 ⁇ m or more and 10 ⁇ m or less, and the tip
  • the length of the portion is different on the left and right sides with respect to the center line of the base, and the difference is 1 ⁇ m or more and 20 ⁇ m or less, and further, the internal angle of the intersection angle of the two straight lines along the left and right blade surfaces is 4 ⁇ m.
  • Patent Document 3 Japanese Unexamined Patent Publication No. 2004-174464 discloses that grinding grooves can be easily formed using a cup-shaped grindstone.
  • a grinding groove extending in the short side direction is formed on the blade surface, and the blade surface is composed of a plurality of stepped surfaces divided in the short side direction, and the stepped surface on the cutting edge side has a larger angle.
  • a cutting blade characterized by:
  • this patent describes a cutting blade made of cemented carbide that suppresses distortion (processing damage) of the WC grains that make up the cutting edge, improves chipping resistance, suppresses deterioration of cut surface quality and cutting resistance due to chipping, and provides a long-lasting product.
  • This invention relates to a long-life cemented carbide cutter.
  • a dicing method As methods for cutting green sheets, there are a method of cutting with a rotating round blade called a dicing method, and a push cutting method using a flat cutting blade as disclosed in the present disclosure.
  • the former method has disadvantages such as poor material yield due to a large amount of cutting waste and poor cutting speed, so the push-cutting method is useful for small-sized products.
  • FIG. 1 is a front view of a cemented carbide cutting blade 1.
  • FIG. 2 is a perspective view of the cutting blade 1 made of cemented carbide.
  • FIG. 3 is a perspective view of the two-stage cemented carbide cutting blade 1.
  • a cutting blade 1 made of cemented carbide includes a cutting edge part 2 that performs cutting, a connecting part 3 connected to the cutting edge part 2, and a cutting blade fixing part 5 connected to the connecting part 3. It has a base 4 fixed by.
  • the object to be cut 100 can be cut by pressing the cutting edge portion 2 against the object to be cut 100.
  • a cutting blade 1 made of cemented carbide as a flat cutting blade extends in the x direction orthogonal to the y and z directions in FIG.
  • Blade surfaces 201 and 202 are provided on both sides of the cutting edge portion 2.
  • the blade surfaces 203 and 204 are provided, resulting in a two-stage blade.
  • Each blade surface 201 to 204 may have a linear shape or a curved shape.
  • the ridgeline where the blade surface 201 and the blade surface 202 intersect is the blade edge 210.
  • the cemented carbide cutting blade 1 includes a connecting portion 3 as a base, and a cutting edge portion 2 as a blade portion that is provided on an extension of the connecting portion 3 and has a cutting edge 210 as the most distal end.
  • the KAM value which is the distortion of the WC particles constituting the left and right blade surfaces 201 and 202 forming the cutting edge 210, is 0 or more and 4.0 or less.
  • the KAM value which is the distortion of the WC particles forming the blade surfaces 201 and 202, is 0 or more and 4.0 or less, so cracks inside the WC are suppressed. It is possible to improve fracture resistance.
  • the KAM value is 0.3 or more and 4.0 or less. More preferably, the KAM value is 0.3 or more and 2.1 or less.
  • the cobalt content in the cemented carbide is 3% by mass or more and 25% by mass or less.
  • the hardness of the cemented carbide is a Vickers hardness of Hv 1300 or more and Hv 2030 or less.
  • Such thin blades are made of hard materials such as carbon tool steel, stainless steel, and cemented carbide.
  • machining is not easy, and the reasons for this are that, although the material is hard, although it has rigidity, it is difficult to cut, has low toughness and is easily chipped, and if the blade is thin, it is made of hard material. Particularly at the tip of the cutting edge, the blade tends to escape due to the pressure of the grindstone during machining.
  • the WC that makes up the blade surface deteriorates due to the accuracy of the processing machine, changes in the grindstone over time, and external disturbances such as vibration.
  • the number of chips that occur can be reduced and the size of the chips can be reduced.
  • the material used for the cutting blade is a cemented carbide whose main components are tungsten carbide and cobalt, and the average grain size of the tungsten carbide crystal grains in the alloy is 0.1 ⁇ m to 4 ⁇ m, preferably 2 ⁇ m or less.
  • the average grain size is determined by measuring the surface of the cemented carbide in an SEM photograph at a magnification of 10,000 times, selecting 100 arbitrary crystals, and using the formula (major axis + minor axis)/2 for each crystal. The particle size was calculated based on , and the average value of 100 particle sizes was determined.
  • tungsten carbide it is also possible to add 0.1 to 2% by mass of TaC (tantalum carbide), a component for suppressing crystal grain growth.
  • This additive can also be replaced and combined with V 8 C 7 (vanadium carbide), Cr 3 C 2 (chromium carbide). In that case, the amount of each added is 0.1 to 2% by mass.
  • the cobalt used in the cemented carbide preferably ranges from 3 to 25% by mass, more preferably from 5 to 20% by mass.
  • TaC, V 8 C 7 and Cr 3 C 2 are obtained by dissolving these components from cemented carbide using nitric acid or hydrofluoric acid, and then converting the resulting liquid into a liquid using an ICP emission spectrometer (Issuance spectroscopy). can be measured. After Co is dissolved from a cemented carbide using nitric acid or hydrofluoric acid, the mass of the solution whose liquid properties are adjusted can be measured using a potentiometric titration device (potentiometric titration method).
  • the Vickers hardness Hv is preferably 1,300 or more and 2,030 or less, and a more preferable range is 1,850 or more and 2,150 or less.
  • the base material thickness T of the cemented carbide cutting blade is preferably 0.1 mm or more and 0.6 mm or less. By setting it within this range, it can be used as a cutting blade (compatible with a cutting machine) for laminated ceramic green sheets.
  • the cutter with a thickness of 0.1 mm is used for the thinnest chips of ceramic capacitors, and can reduce the grinding allowance and reduce the grinding resistance when producing sharp edges such as a 20° cutting edge angle by grinding, resulting in high precision. You can make a cutting edge.
  • cutters with a base material thickness of 0.4 to 0.6 mm are suitable for cutting thick chips with a thickness of 1 mm or more because the rigidity (bending of the root of the cutting edge) can be improved by increasing the thickness of the cutter itself. There is. Another advantage is that the rigidity of the base of the blade is increased, making diagonal cuts less likely to occur.
  • the thickness of a carbide cutting blade can be measured using a micrometer or a laser measuring device.
  • the relationship between the length L (mm) and the height W (mm) (FIG. 2) of the cemented carbide cutting blade is preferably 1 ⁇ L/W ⁇ 20.
  • the cutting edge angle ⁇ is 6° ⁇ 30° or less.
  • the smaller the cutting edge angle the smaller the cutting resistance and the less likely diagonal cutting will occur. In other words, the volume that penetrates into the workpiece becomes smaller.
  • a single-stage blade may be used, but since the width dimension forming the blade surface becomes large, there are problems such as the blade tip being prone to collapse due to grinding resistance and making it difficult to process the blade edge into a highly accurate shape. It is known that chipping during cutting is extremely likely to occur when ⁇ 20°.
  • Example A tip blade portion was formed using cemented carbide FM10K material manufactured by Allied Materials Co., Ltd.
  • the flat cutting blade used in the test has a blade length direction L: 40 mm, a base thickness T: 0.1 mm, and a blade height W: 25.0 mm.
  • the cutting edge angle ⁇ of the cutting edge part 2 as the cutting part is 20° ⁇ 5'
  • the first stage blade width is 0.1 mm
  • the second stage blade angle (the extended plane of the second stage blade surface intersects angle) was set to 4° ⁇ 10'.
  • a surface grinder was used, and a diamond cylindrical grindstone was used to true the side of the grindstone, and the material was fixed on a special work rest with an adjustable angle.
  • cemented carbide cutting blades 1 having sample numbers 1 to 45, 101 to 145, 201 to 245, and 301 to 345 shown in Tables 1 to 8 were produced.
  • the roughness Sa (arithmetic mean roughness) of the blade surface was measured by using a non-contact three-dimensional roughness measuring device (Nexview (registered trademark)) manufactured by Zygo Corporation, and measuring the measurement range in the above longitudinal section in the X direction directly below the cutting edge. It was set to 140 ⁇ m and 30 ⁇ m in the Z direction.
  • the measurement field of view was set to have an objective lens magnification of 50 times and a ZOOM magnification of 1 time.
  • ⁇ Measurement of blade edge width> To measure the edge line width of the cutting edge, use a JEOL Schottky field emission scanning electron microscope JSM7900F to take an image from a direction perpendicular to the edge of the cutting edge at 5,000 to 10,000 times magnification, and utilize mechanical coordinates and length measurement functions. It was measured by It was confirmed that the edge line width of the cutting edge was 0.5 ⁇ m or less in all the samples, and these samples were used as test blades.
  • ⁇ WC distortion measurement> The distortion of the WC particles on the left and right blade surfaces 201 and 202 constituting the cutting edge 210 is measured using a reflected electron beam formed using the SEM/EBSD (Electron Back Scatter Diffraction) method, an electron back scattering diffraction device mounted on the aforementioned electron microscope.
  • This method uses a diffraction pattern (channeling pattern) to measure crystal orientation.
  • the measurement conditions are as follows: measurement magnification: 20,000 times, acceleration voltage: 25 KV, irradiation current: 12 nA, using a reflected electron beam diffraction pattern (channeling pattern) formed by applying an electron beam to the cutting edge at a 70° inclination. Distortion was quantified and evaluated by measuring a KAM (kernel average misorientation value) map.
  • Chipping of the cutting blade was measured using a tool measuring microscope STM-UM manufactured by Olympus Corporation at a magnification of 500 times. In all samples, it was confirmed that the chip depth was within 1.5 ⁇ m and the chip width was within 10 ⁇ m.
  • an object to be cut (work) 100 is cut with a cutting blade 1 made of cemented carbide.
  • An acrylic base 102 is placed on the cutting dynamometer 103.
  • a thermally releasable adhesive sheet 101 is interposed between the base and the object 100 to be cut.
  • the object to be cut 100 is cut by moving the object to be cut 100 in the direction shown by the arrow 110 while reciprocating the cutting blade 1 made of cemented carbide in the direction shown by the arrow 111.
  • a foamed double-sided adhesive sheet of 1 mm and a workpiece (the above-mentioned PVC board) having a thickness of 0.5 mm ⁇ 0.1 (these constitute the object to be cut 100) are used, and the installation accuracy of the cutter is set at the workpiece in the longitudinal direction and the blade angle of ⁇ 0.1 mm. 5°, and the cross-sectional angle between the workpiece and the blade was 90° ⁇ 0.5°.
  • the cutting conditions were a cutting speed of 300 mm/s, a cutting interval of 12 mm, and an indentation amount of 0.1 mm in the adhesive layer of the thermally releasable sheet.
  • PVC was cut 1000 times, and the cutting resistance, cut surface quality, and The number of chips of 10 ⁇ m or more when cut once, 500 times, and 1000 times was evaluated. The results obtained by repeating this result for each condition are shown in Tables 1 to 8.
  • the preferable KAM value range is 0.3 or more and 4.0 or less.
  • a better range of KAM values is 0.3 to 2.1.
  • the most preferable value is 0.3 or less.
  • setting the KAM value to a range of 0 or more and less than 0.3 is expensive, so in the above embodiment, the KAM value is set to 0.3 or more. That is, considering only performance, it is preferable to set the KAM value to less than 0.3.
  • the number of chips with the corresponding chip width is shown.
  • the column “10 ⁇ m ⁇ ” is the number of chips with a width exceeding 9.5 ⁇ m
  • the column “6 ⁇ m ⁇ 9 ⁇ m” is the number of chips with a width exceeding 6.5 ⁇ m and 9.5 ⁇ m or less
  • the column “3 ⁇ m ⁇ 5 ⁇ m” is the number of chips with a width exceeding 9.5 ⁇ m.
  • the column shows the number of chips with a width of more than 2.5 ⁇ m and less than 5.5 ⁇ m.
  • KAM value good cutting results were obtained in terms of the number of chips in the range of 0.3 or more and 4.0 or less.
  • a better range of KAM values is 0.3 or more and 2.1 or less.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Powder Metallurgy (AREA)
  • Nonmetal Cutting Devices (AREA)

Abstract

This cutting blade made of a super-hard alloy comprises a base portion, and a blade portion provided on an extension line of the base portion and having a blade tip, which is a tip end portion. A KAM value, which represents distortion of WC particles constituting left and right blade surfaces forming the blade tip, is 0 to 4.0 inclusive.

Description

超硬合金製切断刃Cemented carbide cutting blade
　本開示は、超硬合金製切断刃に関する。本出願は、２０２２年３月１８日に出願した日本特許出願である特願２０２２－０４３４３０号に基づく優先権を主張する。当該日本特許出願に記載された全ての記載内容は、参照によって本明細書に援用される。 The present disclosure relates to a cutting blade made of cemented carbide. This application claims priority based on Japanese Patent Application No. 2022-043430, which is a Japanese patent application filed on March 18, 2022. All contents described in the Japanese patent application are incorporated herein by reference.
　従来、超硬合金製切断刃は、たとえば特開平１０－２１７１８１号公報（特許文献１）、国際公開２０１４－０５０８８４号（特許文献２）および特開２００４－１７４４４号公報（特許文献３）において開示されている。 Conventionally, cutting blades made of cemented carbide have been disclosed, for example, in JP-A-10-217181 (Patent Document 1), WO 2014-050884 (Patent Document 2), and JP-A-2004-17444 (Patent Document 3). has been done.
特開平１０－２１７１８１号公報Japanese Patent Application Publication No. 10-217181 国際公開２０１４－０５０８８４号International Publication No. 2014-050884 特開２００４－１７４４４号公報Japanese Patent Application Publication No. 2004-17444
　超硬合金製切断刃は、基部と、前記基部の延長線上に設けられ、最先端部である刃先を有する刃部とを備え、刃先を形成する左右刃面を構成するＷＣ粒子の歪みであるＫＡＭ値が０以上４．０以下である。 The cemented carbide cutting blade includes a base and a blade part that is provided on an extension of the base and has a cutting edge that is the cutting edge, and is a distortion of the WC particles that constitute the left and right blade surfaces that form the cutting edge. The KAM value is 0 or more and 4.0 or less.
図１は、超硬合金製切断刃１の正面図である。FIG. 1 is a front view of a cutting blade 1 made of cemented carbide. 図２は、超硬合金製切断刃１の斜視図である。FIG. 2 is a perspective view of the cutting blade 1 made of cemented carbide. 図３は、２段の超硬合金製切断刃１の斜視図である。FIG. 3 is a perspective view of the two-stage cemented carbide cutting blade 1. 図４は、切断方法を説明するために示す超硬合金製切断刃１の正面図である。FIG. 4 is a front view of the cemented carbide cutting blade 1 shown for explaining the cutting method.
[本開示が解決しようとする課題]
　従来の超硬合金製切断刃においては、耐久性が低いという問題があった。 [Problems to be solved by this disclosure]
Conventional cutting blades made of cemented carbide have a problem of low durability.
　特許文献１（特開平１０－２１７１８１号公報）は、セラミックグリーンシート等の薄板状のワークを切断する平刃状の切断刃にあって、高精度な切断を可能にする狭い刃先角を確保しつつ座屈強度が高い平刃状の切断刃を開示している。 Patent Document 1 (Japanese Unexamined Patent Publication No. 10-217181) discloses a flat cutting blade for cutting thin plate-like workpieces such as ceramic green sheets, which secures a narrow cutting edge angle that enables high-precision cutting. The present invention discloses a flat cutting blade that has high buckling strength.
　その解決手段として、刃先部を中心線Ｙに対し左右対称の平面または凹湾曲面で形成し、刃先部と基部とを一段又は複数段の左右対称の凹湾曲面の補強部で連絡することで切断実行部の距離を短くして高精度な切断加工を確保しつつ座屈強度を高めることを提案している。 A solution to this problem is to form the cutting edge with a flat or concave curved surface that is symmetrical with respect to the center line Y, and to connect the cutting edge and the base with one or more reinforcing parts of the symmetrical concave curved surface. It is proposed to shorten the distance of the cutting section to ensure high-precision cutting while increasing buckling strength.
　特許文献２（国際公開２０１４－０５０８８４号）は、平板上の基部と、前記基部の両面から互いに近づくように傾斜した左右刃面と、前記左右刃面を結ぶように形成され、凸湾曲面を有する刃先先端を有し、板厚方向の断面形状において、前記左右刃面に沿った２本の直線の交点と前記刃先先端の再尾短距離が１μｍ以上、１０μｍ以下であり、かつ、前記先端部の長さが、前記基部の中心線に対して左右で異なり、その差異が１μｍ以上、２０μｍ以下であり、さらに、前記左右刃面に沿った２本の直線の交差角度の内角が、４度以上、６０度以下であることを特徴とする平刃状切断刃を提案している。 Patent Document 2 (International Publication No. 2014-050884) discloses a base on a flat plate, left and right blade surfaces that are inclined to approach each other from both sides of the base, and a convex curved surface formed to connect the left and right blade surfaces. In the cross-sectional shape in the plate thickness direction, the short distance between the intersection of two straight lines along the left and right blade surfaces and the tip of the cutting edge is 1 μm or more and 10 μm or less, and the tip The length of the portion is different on the left and right sides with respect to the center line of the base, and the difference is 1 μm or more and 20 μm or less, and further, the internal angle of the intersection angle of the two straight lines along the left and right blade surfaces is 4 μm. We have proposed a flat cutting blade characterized by an angle of at least 60 degrees.
　特許文献３（特開２００４－１７４４４号公報）は、カップ型砥石を使用し、研削溝を容易に形成することができることを開示している。板状のセラミック体をその厚み方向に押圧力を作用させて切断する略矩形形状の切断刃であって、長辺方向の一辺に沿って平面によって形成された刃面を有し、該刃面に短辺方向に延在する研削溝が形成され、前記刃面は短辺方向に分割された複数の段付き面によって構成され、刃先側の段付き面ほど大きい角度を有していることを特徴とする切断刃を開示している。 Patent Document 3 (Japanese Unexamined Patent Publication No. 2004-17444) discloses that grinding grooves can be easily formed using a cup-shaped grindstone. A substantially rectangular cutting blade for cutting a plate-shaped ceramic body by applying a pressing force in the thickness direction thereof, the blade having a blade surface formed by a plane along one side in the long side direction; A grinding groove extending in the short side direction is formed on the blade surface, and the blade surface is composed of a plurality of stepped surfaces divided in the short side direction, and the stepped surface on the cutting edge side has a larger angle. Discloses a cutting blade characterized by:
　近年、ＭＬＣＣ（Ｍｕｌｔｉｌａｙｅｒ　Ｃｅｒａｍｉｃ　Ｃａｐａｃｉｔｏｒｓ）の高密度積層技術により、大型のＭＬＣＣのダウンサイズ化が進んでいる。ダウンサイズ化されることでＮｉ電極の積層数は増え、また、誘電体であるチタン酸バリウムの粒径を数十ｎｍにすることで厚み方向の電極間距離は数百ｎｍ以下となってきている。そのため、グリーンシートの硬度は高くなるに加え、電極間距離が短くなると切断面品位が悪化する傾向にある。そのような中で、本特許は超硬合金製切断刃において、刃先を構成するWC粒子の歪（加工ダメージ）を抑え耐欠損性を高め欠けによる切断面品位、切断抵抗の悪化を抑制し長寿命な超硬合金製カッターを提供する発明に関するものである。 In recent years, downsizing of large MLCCs has been progressing due to the high-density stacking technology of MLCCs (Multilayer Ceramic Capacitors). Downsizing has increased the number of stacked Ni electrodes, and by reducing the particle size of the dielectric barium titanate to tens of nanometers, the distance between the electrodes in the thickness direction has become less than a few hundred nanometers. There is. Therefore, in addition to increasing the hardness of the green sheet, when the distance between the electrodes becomes short, the quality of the cut surface tends to deteriorate. Under these circumstances, this patent describes a cutting blade made of cemented carbide that suppresses distortion (processing damage) of the WC grains that make up the cutting edge, improves chipping resistance, suppresses deterioration of cut surface quality and cutting resistance due to chipping, and provides a long-lasting product. This invention relates to a long-life cemented carbide cutter.
　積層セラミックスコンデンサを製造するために、厚さが数百μｍから数ｍｍの積層されたグリーンシートの切断要求がある。これを精度良く連続的に切断した後、ひとつひとつの被切断物を焼成し、両端に電極を取り付けることでコンデンサとしている。ここで、コンデンサは近年スマートフォンを代表とする小型機対応のため小サイズ化の要求が増しており、そのため高度な切断精度が要求される。このような小サイズセラミックコンデンサを実現するためには、刃先加工において発生するWC粒子の歪みを軽減しカッター使用時に発生する衝撃及び熱変位から進展する欠けを抑制することでグリーンシート切断面に損傷を与えないことが必要である。 In order to manufacture multilayer ceramic capacitors, there is a need to cut laminated green sheets with a thickness of several hundred μm to several mm. After cutting this material continuously with high precision, each object is fired and electrodes are attached to both ends to create a capacitor. In recent years, there has been an increasing demand for capacitors to be smaller in size to accommodate small devices such as smartphones, which requires a high level of cutting precision. In order to create such small-sized ceramic capacitors, we need to reduce the distortion of WC particles that occurs during cutting edge machining, and prevent damage to the cut surface of the green sheet by suppressing chipping that develops from the impact and thermal displacement that occurs when using a cutter. It is necessary not to give
　グリーンシートの切断方法としては、ダイシング法と呼ばれる回転丸刃にて切断する方法と、本開示のような平刃状切断刃を用いた押切方式がある。前者は切削屑が多く出る為に材料歩留が悪く、また切断速度が劣るという欠点などがあり、小サイズ品には押切方式が有用である。 As methods for cutting green sheets, there are a method of cutting with a rotating round blade called a dicing method, and a push cutting method using a flat cutting blade as disclosed in the present disclosure. The former method has disadvantages such as poor material yield due to a large amount of cutting waste and poor cutting speed, so the push-cutting method is useful for small-sized products.
　図１は、超硬合金製切断刃１の正面図である。図２は、超硬合金製切断刃１の斜視図である。図３は、２段の超硬合金製切断刃１の斜視図である。 FIG. 1 is a front view of a cemented carbide cutting blade 1. FIG. 2 is a perspective view of the cutting blade 1 made of cemented carbide. FIG. 3 is a perspective view of the two-stage cemented carbide cutting blade 1.
　図１から図３で示すように、超硬合金製切断刃１は、切断を実行する刃先部２、刃先部２に連結される連結部３および連結部３に連結されて切断刃固定部５によって固定される基部４とを有する。 As shown in FIGS. 1 to 3, a cutting blade 1 made of cemented carbide includes a cutting edge part 2 that performs cutting, a connecting part 3 connected to the cutting edge part 2, and a cutting blade fixing part 5 connected to the connecting part 3. It has a base 4 fixed by.
　被切断物１００に刃先部２を押しつけることで、被切断物１００を切断することができる。平刃状切断刃としての超硬合金製切断刃１は、図１におけるｙおよびｚ方向と直交するｘ方向に延在している。 The object to be cut 100 can be cut by pressing the cutting edge portion 2 against the object to be cut 100. A cutting blade 1 made of cemented carbide as a flat cutting blade extends in the x direction orthogonal to the y and z directions in FIG.
　刃先部２の両側に刃面２０１，２０２が設けられている。図３では刃面２０３，２０４が設けられることで、２段刃となっている。各刃面２０１から２０４は直線形状であってもよく、曲線形状であってもよい。刃面２０１と刃面２０２が交差する稜線が刃先２１０である。 Blade surfaces 201 and 202 are provided on both sides of the cutting edge portion 2. In FIG. 3, the blade surfaces 203 and 204 are provided, resulting in a two-stage blade. Each blade surface 201 to 204 may have a linear shape or a curved shape. The ridgeline where the blade surface 201 and the blade surface 202 intersect is the blade edge 210.
　本開示に従った超硬合金製切断刃１は、基部としての連結部３と、連結部３の延長線上に設けられ、最先端部である刃先２１０を有する刃部としての刃先部２とを備え、刃先２１０を形成する左右の刃面２０１，２０２を構成するＷＣ粒子の歪みであるＫＡＭ値が０以上４．０以下である。 The cemented carbide cutting blade 1 according to the present disclosure includes a connecting portion 3 as a base, and a cutting edge portion 2 as a blade portion that is provided on an extension of the connecting portion 3 and has a cutting edge 210 as the most distal end. The KAM value, which is the distortion of the WC particles constituting the left and right blade surfaces 201 and 202 forming the cutting edge 210, is 0 or more and 4.0 or less.
　このように構成された、超硬合金製切断刃１においては、刃面２０１，２０２を構成するＷＣ粒子の歪みであるＫＡＭ値が０以上４．０以下であるため、ＷＣ内部の亀裂を抑制でき、耐欠損性を高めることができる。 In the cemented carbide cutting blade 1 configured in this way, the KAM value, which is the distortion of the WC particles forming the blade surfaces 201 and 202, is 0 or more and 4.0 or less, so cracks inside the WC are suppressed. It is possible to improve fracture resistance.
　好ましくは、前記ＫＡＭ値が０．３以上４．０以下である。より好ましくは、前記ＫＡＭ値が０．３以上２．１以下である。 Preferably, the KAM value is 0.3 or more and 4.0 or less. More preferably, the KAM value is 0.3 or more and 2.1 or less.
　好ましくは、超硬合金中のコバルトの含有率が３質量％以上２５質量％以下である。
　好ましくは、超硬合金の硬度はビッカース硬度Ｈｖ１３００以上、２０３０以下である。 Preferably, the cobalt content in the cemented carbide is 3% by mass or more and 25% by mass or less.
Preferably, the hardness of the cemented carbide is a Vickers hardness of Hv 1300 or more and Hv 2030 or less.
　このような薄刃は例えば炭素工具鋼、ステンレス鋼の他、超硬合金などの硬質材料が用いられている。しかし加工が容易ではなくその原因として、特に材質が硬質材料である場合、剛性はあるものの、難切削性であり且つ靱性が低く欠け易いことや、また、刃厚が薄い場合硬質材料であっても特に刃先先端部では加工中に砥石の押圧により刃が逃げようとすることなどが挙げられる。さらに、加工機の精度、砥石の経時変化、振動などの外乱により刃面を構成するWCの劣化が挙げられる。 Such thin blades are made of hard materials such as carbon tool steel, stainless steel, and cemented carbide. However, machining is not easy, and the reasons for this are that, although the material is hard, although it has rigidity, it is difficult to cut, has low toughness and is easily chipped, and if the blade is thin, it is made of hard material. Particularly at the tip of the cutting edge, the blade tends to escape due to the pressure of the grindstone during machining. Furthermore, the WC that makes up the blade surface deteriorates due to the accuracy of the processing machine, changes in the grindstone over time, and external disturbances such as vibration.
　従来、上述の特性を満たすために種々の切断刃が提案されているが、形状を複雑化させた場合、更に加工が困難となることは避けられず、安定した形状精度と加工性を共に満足する切断刃は得られていない。 Conventionally, various cutting blades have been proposed to meet the above characteristics, but if the shape is complicated, it is inevitable that processing becomes even more difficult. A cutting blade that does this has not been obtained.
　効果
　欠けの発生個数の低減と欠けのサイズを縮小することができる。 Effect : The number of chips that occur can be reduced and the size of the chips can be reduced.
　ＷＣ粒子の歪値をＳＥＭ／ＥＢＳＤ　（Electron　Back　Scatter　Diffraction）法を用い測定領域全体の結晶方位分布（方位マップ）を取得し結晶方位差情報から、内部の残留歪をＫＡＭ（kernel　Average　Misorientation）値マップの測定にて数値化した。結果、ＫＡＭ値を４．０以下にすることでＷＣ内部の亀裂を抑制でき、耐欠損性を高めることができることが判明した。本手法を使用することで刃先を鈍角にせずとも、鋭角な刃先角度θでも欠けの抑制を図ることができ、切れ味が長期に持続し、寿命の長い超硬切断刃を提供することができる。 Obtain the crystal orientation distribution (orientation map) of the entire measurement area using the SEM/EBSD (Electron Back Scatter Diffraction) method to obtain the strain value of the WC particle, and use the crystal orientation difference information to calculate the internal residual strain as a KAM (kernel average misorientation) value. It was quantified by measuring the map. As a result, it was found that by setting the KAM value to 4.0 or less, cracks inside the WC could be suppressed and fracture resistance could be improved. By using this method, it is possible to suppress chipping even at an acute cutting edge angle θ without making the cutting edge obtuse, and it is possible to provide a carbide cutting blade that maintains sharpness for a long time and has a long life.
　材質
　切断刃に用いる材質はタングステンカーバイドとコバルトを主成分とした超硬合金で合金中のタングステンカーバイド結晶粒の大きさは平均粒径が０．１μｍ～４μｍで２μｍ以下が好ましい。平均粒径は、ＳＥＭ写真において、超硬合金の表面を１万倍の倍率で測定して、任意の１００個の結晶を選択し、各々の結晶において（長径＋短径）／２の計算式に基づいて粒径を計算し、１００個の粒径の平均値を求めた。 Material The material used for the cutting blade is a cemented carbide whose main components are tungsten carbide and cobalt, and the average grain size of the tungsten carbide crystal grains in the alloy is 0.1 μm to 4 μm, preferably 2 μm or less. The average grain size is determined by measuring the surface of the cemented carbide in an SEM photograph at a magnification of 10,000 times, selecting 100 arbitrary crystals, and using the formula (major axis + minor axis)/2 for each crystal. The particle size was calculated based on , and the average value of 100 particle sizes was determined.
　また、タングステンカーバイトの結晶粒を制御するため結晶粒成長抑制のための成分ＴａＣ（タンタルカーバイド）を０．１～２質量％添加することも可能である。この添加剤はＶ８Ｃ７（バナジウムカーバイド）、Ｃｒ３Ｃ２（クロムカーバイド）でも置き替え及び組み合わせる事ができる。その場合は各々の添加量が０．１～２質量％。超硬合金に使用されるコバルトは３～２５質量％の範囲が好ましく、５～２０質量％の範囲であることがより好ましい。ＴａＣ、Ｖ８Ｃ７、Ｃｒ３Ｃ２は、硝酸、フッ酸を用いてこれらの成分を超硬合金から溶解したのち後、液体状にしたものをＩＣＰ発光分光装置（発行分光法）で質量を測定できる。Ｃｏは、硝酸、フッ酸を用いて超硬合金から溶解した後、液性を調整した溶液を電位差滴定装置（電位差滴定法）で質量を測定できる。 Furthermore, in order to control the crystal grains of tungsten carbide, it is also possible to add 0.1 to 2% by mass of TaC (tantalum carbide), a component for suppressing crystal grain growth. This additive can also be replaced and combined with V 8 C 7 (vanadium carbide), Cr 3 C 2 (chromium carbide). In that case, the amount of each added is 0.1 to 2% by mass. The cobalt used in the cemented carbide preferably ranges from 3 to 25% by mass, more preferably from 5 to 20% by mass. TaC, V 8 C 7 and Cr 3 C 2 are obtained by dissolving these components from cemented carbide using nitric acid or hydrofluoric acid, and then converting the resulting liquid into a liquid using an ICP emission spectrometer (Issuance spectroscopy). can be measured. After Co is dissolved from a cemented carbide using nitric acid or hydrofluoric acid, the mass of the solution whose liquid properties are adjusted can be measured using a potentiometric titration device (potentiometric titration method).
　超硬合金の硬度はビッカース硬度Ｈｖが、１３００以上、２０３０以下が好ましく、より好ましい範囲は１８５０以上２１５０以下である。 As for the hardness of the cemented carbide, the Vickers hardness Hv is preferably 1,300 or more and 2,030 or less, and a more preferable range is 1,850 or more and 2,150 or less.
　厚み
　超硬合金製切断刃の基材厚さＴは、０．１ｍｍ以上～０．６ｍｍ以下が好ましい。この範囲とすることにより、積層セラミックグリーンシートの切断刃（切断機に対応）として使用できる。厚み０．１ｍｍサイズのカッターは、セラミックコンデンサーの中でも薄いチップ用で刃先角度２０°などの鋭角刃を研削加工で製作する上で研削代を小さくでき、研削抵抗を下げることができるため高精度な刃先を作ることができる。一方基材厚０．４～０．６ｍｍのカッターは、カッター自体の厚みを大きくすることで剛性（刃先の根本の撓み）を向上させることができるため厚み１ｍｍ以上の厚いチップの切断に適している。また、刃の根本の剛性が高まることで斜め切断が起こりにくいなどの利点がある。 Thickness The base material thickness T of the cemented carbide cutting blade is preferably 0.1 mm or more and 0.6 mm or less. By setting it within this range, it can be used as a cutting blade (compatible with a cutting machine) for laminated ceramic green sheets. The cutter with a thickness of 0.1 mm is used for the thinnest chips of ceramic capacitors, and can reduce the grinding allowance and reduce the grinding resistance when producing sharp edges such as a 20° cutting edge angle by grinding, resulting in high precision. You can make a cutting edge. On the other hand, cutters with a base material thickness of 0.4 to 0.6 mm are suitable for cutting thick chips with a thickness of 1 mm or more because the rigidity (bending of the root of the cutting edge) can be improved by increasing the thickness of the cutter itself. There is. Another advantage is that the rigidity of the base of the blade is increased, making diagonal cuts less likely to occur.
　超硬切断刃の厚さの測定方法は、マイクロメータ、またはレーザー測定器がある。
　超硬合金切断刃の長さＬ（ｍｍ）と高さＷ（ｍｍ）（図２）との関係は１≦Ｌ／Ｗ≦２０となることが好ましい。 The thickness of a carbide cutting blade can be measured using a micrometer or a laser measuring device.
The relationship between the length L (mm) and the height W (mm) (FIG. 2) of the cemented carbide cutting blade is preferably 1≦L/W≦20.
　刃先角度θは６°≦θ≦３０°以下であることが好ましい。
　刃先角度が小さい方が切断抵抗は小さくなり、ナナメ切断も起こりにくくなる。つまり、ワークに侵入する体積が小さくなるからである。１０°以下については１段刃でも良いが、刃面を形成する幅寸法が大きくなるため研削抵抗により倒れやすく刃先を高精度な形状に加工しにくいなどの問題がある。刃付け時のチッピングについてはθ≦２０°を境に極端に発生しやすくなることがわかっている。 It is preferable that the cutting edge angle θ is 6°≦θ≦30° or less.
The smaller the cutting edge angle, the smaller the cutting resistance and the less likely diagonal cutting will occur. In other words, the volume that penetrates into the workpiece becomes smaller. For angles of 10 degrees or less, a single-stage blade may be used, but since the width dimension forming the blade surface becomes large, there are problems such as the blade tip being prone to collapse due to grinding resistance and making it difficult to process the blade edge into a highly accurate shape. It is known that chipping during cutting is extremely likely to occur when θ≦20°.
　実施例
　株式会社アライドマテリアル製超硬合金ＦＭ１０Ｋ素材を用いて先端刃部の形成加工行った。試験に用いる平刃状切断刃は、刃渡り方向Ｌ：４０ｍｍ、基部厚さＴ：０．１ｍｍ、刃高さＷ：２５．０ｍｍである。切断実行部としての刃先部２の切れ刃角度θを２０°±５’とし第１段目の刃幅を０．１ｍｍとし２段目の刃角度（２段目の刃面の延長面が交差して形成する角度）を４°±１０’とした。刃先成形加工に於いては平面研削盤を用い、ダイヤモンド円筒砥石を使用し砥石の側面をツルーイングし、角度調整可能な専用のワークレストに素材を固定して加工を行った。これにより表１から表８に示す試料番号１から４５、１０１から１４５、２０１から２４５および３０１から３４５の超硬合金製切断刃１を作製した。 Example A tip blade portion was formed using cemented carbide FM10K material manufactured by Allied Materials Co., Ltd. The flat cutting blade used in the test has a blade length direction L: 40 mm, a base thickness T: 0.1 mm, and a blade height W: 25.0 mm. The cutting edge angle θ of the cutting edge part 2 as the cutting part is 20° ± 5', the first stage blade width is 0.1 mm, and the second stage blade angle (the extended plane of the second stage blade surface intersects angle) was set to 4°±10'. For the cutting edge forming process, a surface grinder was used, and a diamond cylindrical grindstone was used to true the side of the grindstone, and the material was fixed on a special work rest with an adjustable angle. As a result, cemented carbide cutting blades 1 having sample numbers 1 to 45, 101 to 145, 201 to 245, and 301 to 345 shown in Tables 1 to 8 were produced.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000006
Figure JPOXMLDOC01-appb-T000006
Figure JPOXMLDOC01-appb-T000007
Figure JPOXMLDOC01-appb-T000007
Figure JPOXMLDOC01-appb-T000008
Figure JPOXMLDOC01-appb-T000008
　＜刃先表面ＷＣの残留歪の除去＞
　電解研磨を用いた電気化学的研磨を行う事で超硬合金の刃先表面を除去し、先端角を形成する刃面に残留する砥石による刃先形成時に残留したと思われる歪みを除去した。切断刃の刃部を下方に向け、その形状に添う形に成形した電極を下部に置き、これらを１００ｇ／ｄｍ３のＮａＮＯ３を含む電解液中に浸漬し、超硬合金切断刃が陽極となる様に電源を配置し、０．１～１．０Ａ／ｃｍ２程度の電流密度になる様に電圧を調整した。 <Removal of residual strain on the cutting edge surface WC>
By performing electrochemical polishing using electrolytic polishing, the surface of the cemented carbide cutting edge was removed, and the distortion that remained on the blade surface that forms the tip angle, which was thought to have remained during the formation of the cutting edge with a grindstone, was removed. With the blade of the cutting blade facing downward, an electrode molded to follow the shape is placed at the bottom, and these are immersed in an electrolyte containing 100 g/dm 3 of NaNO 3 so that the cemented carbide cutting blade serves as the anode. The power supplies were arranged so that the voltage was adjusted to a current density of about 0.1 to 1.0 A/cm 2 .
　電解研磨は、超硬切断刃の表面状態を確認しながら研磨条件、研磨時間を調整した。
　＜表面粗さの測定＞
　刃面の粗さ測定Ｓａ（算術平均粗さ）はＺｙｇｏ　Ｃｏｒｐｏｒａｔｉｏｎ製の非接触三次元粗さ測定装置（Ｎｅｘｖｉｅｗ（登録商標））を用い、上記縦断面における測定範囲を、刃先直下のＸ方向に１４０μｍ、Ｚ方向に３０μｍとした。測定視野は、対物レンズの倍率を５０倍、ＺＯＯＭ倍率×１倍とした。 During electrolytic polishing, the polishing conditions and polishing time were adjusted while checking the surface condition of the carbide cutting blade.
<Measurement of surface roughness>
The roughness Sa (arithmetic mean roughness) of the blade surface was measured by using a non-contact three-dimensional roughness measuring device (Nexview (registered trademark)) manufactured by Zygo Corporation, and measuring the measurement range in the above longitudinal section in the X direction directly below the cutting edge. It was set to 140 μm and 30 μm in the Z direction. The measurement field of view was set to have an objective lens magnification of 50 times and a ZOOM magnification of 1 time.
　＜刃先稜線幅の測定＞
　刃先の稜線幅測定は日本電子社製のショットキー電界放出型走査電子顕微鏡ＪＳＭ７９００Ｆを用いて５，０００～１００００倍にて刃先稜に対し直交する方向から撮像し、機械座標と測長機能を活用して測定した。すべての試料において、刃先稜線幅は、０．５μｍ以下であることを確認し、これらをテスト刃に使用した。 <Measurement of blade edge width>
To measure the edge line width of the cutting edge, use a JEOL Schottky field emission scanning electron microscope JSM7900F to take an image from a direction perpendicular to the edge of the cutting edge at 5,000 to 10,000 times magnification, and utilize mechanical coordinates and length measurement functions. It was measured by It was confirmed that the edge line width of the cutting edge was 0.5 μm or less in all the samples, and these samples were used as test blades.
　＜ＷＣの歪測定＞
　刃先２１０を構成する左右の刃面２０１，２０２におけるＷＣ粒子の歪測定は前述の電子顕微鏡に搭載された電子後方散乱回折装置ＳＥＭ／ＥＢＳＤ（Electron　Back　Scatter　Diffraction）法を用い形成される反射電子線回折パターン（チャンネリングパターン）を利用し、結晶方位を測定する方法である。測定条件については測定倍率２００００倍、加速電圧２５ＫＶ、照射電流１２ｎＡにて刃先を７０°傾斜させて電子線を当て形成される反射電子線回折パターン（チャンネリングパターン）を利用し、刃先刃面の歪をＫＡＭ（kernel　Average　Misorientation値）マップの測定にて数値化し評価を行った。 <WC distortion measurement>
The distortion of the WC particles on the left and right blade surfaces 201 and 202 constituting the cutting edge 210 is measured using a reflected electron beam formed using the SEM/EBSD (Electron Back Scatter Diffraction) method, an electron back scattering diffraction device mounted on the aforementioned electron microscope. This method uses a diffraction pattern (channeling pattern) to measure crystal orientation. The measurement conditions are as follows: measurement magnification: 20,000 times, acceleration voltage: 25 KV, irradiation current: 12 nA, using a reflected electron beam diffraction pattern (channeling pattern) formed by applying an electron beam to the cutting edge at a 70° inclination. Distortion was quantified and evaluated by measuring a KAM (kernel average misorientation value) map.
　＜欠け測定＞
　切断刃の欠けについては、オリンパス社製工具測定顕微鏡ＳＴＭ－ＵＭ　５００倍により測定した。すべての試料において、欠け深さ１．５μｍ以内で欠け幅１０μｍ以内であることを確認した。 <Chip measurement>
The chipping of the cutting blade was measured using a tool measuring microscope STM-UM manufactured by Olympus Corporation at a magnification of 500 times. In all samples, it was confirmed that the chip depth was within 1.5 μm and the chip width was within 10 μm.
　＜切断テスト＞
　本願切断刃を用いてその効果を確認するため、塩化ビニル板の押切切断を行い切断抵抗、切断刃が被切断物につけた切断傷をもとに切断面の評価を行った。本開示の効果を確認した。図４で示すように、超硬合金製切断刃１において被切断物（ワーク）１００を切断する。切削動力計１０３の上にアクリル製の台座１０２が載置されている。台座と被切断物１００との間に熱剥離粘着シート１０１が介在している。矢印１１１で示す方向に超硬合金製切断刃１を往復運動させつつ矢印１１０で示す方向に被切断物１００を移動させることで、被切断物１００を切断する。 <Cutting test>
In order to confirm the effectiveness of the cutting blade of the present invention, a vinyl chloride plate was pressed and cut, and the cut surface was evaluated based on the cutting resistance and the scratches made by the cutting blade on the object to be cut. The effectiveness of the present disclosure was confirmed. As shown in FIG. 4, an object to be cut (work) 100 is cut with a cutting blade 1 made of cemented carbide. An acrylic base 102 is placed on the cutting dynamometer 103. A thermally releasable adhesive sheet 101 is interposed between the base and the object 100 to be cut. The object to be cut 100 is cut by moving the object to be cut 100 in the direction shown by the arrow 110 while reciprocating the cutting blade 1 made of cemented carbide in the direction shown by the arrow 111.
　本テストの条件
　カッター仕様：刃先角度θ１６°～２０°、２段目の角度４°、厚みＴ：０．１ｍｍ、長さＬ：４０ｍｍ
　ワーク材質：塩ビ板　厚み０．５ｍｍ、長さ２９０ｍｍ、幅３０ｍｍ
　テスト装置：牧野フライス製作所製マシニングセンタＶ５５（以下切断機という）にキスラー製の切削動力計１０３をセット（以下、切削動力計と言う）しワークセットは動力計定盤上面から１０ｍｍのアクリル板、厚み１ｍｍの発泡両面粘着シート、厚み０．５ｍｍ±０．１のワーク（上記塩ビ板）（これらが被切断物１００を構成する）とし、カッターの取り付け精度は長手方向のワークと刃角度±０．５°、ワークと刃断面角度９０°±０．５°とした。切断条件は切断速度３００ｍｍ／ｓ、切断間隔１２ｍｍ、押込み量は熱剥離シートの糊層に０．１ｍｍ刃先が切り込まれる条件で１０００回塩化ビニルの切断を行い、切断抵抗、切断面品位、１回、５００回、１０００回カット時の１０μｍ以上の欠け発生個数を評価した。本結果を条件ごとに繰り返した結果を表１から８に記す。 Conditions for this test Cutter specifications: Blade angle θ16° to 20°, second stage angle 4°, thickness T: 0.1mm, length L: 40mm
Work material: PVC board, thickness 0.5mm, length 290mm, width 30mm
Test equipment: A cutting dynamometer 103 manufactured by Kistler was set (hereinafter referred to as the cutting dynamometer) in a machining center V55 (hereinafter referred to as the cutting machine) manufactured by Makino Milling Co., Ltd. The work set was an acrylic plate with a thickness of 10 mm from the top of the dynamometer surface plate. A foamed double-sided adhesive sheet of 1 mm and a workpiece (the above-mentioned PVC board) having a thickness of 0.5 mm±0.1 (these constitute the object to be cut 100) are used, and the installation accuracy of the cutter is set at the workpiece in the longitudinal direction and the blade angle of ±0.1 mm. 5°, and the cross-sectional angle between the workpiece and the blade was 90°±0.5°. The cutting conditions were a cutting speed of 300 mm/s, a cutting interval of 12 mm, and an indentation amount of 0.1 mm in the adhesive layer of the thermally releasable sheet. PVC was cut 1000 times, and the cutting resistance, cut surface quality, and The number of chips of 10 μm or more when cut once, 500 times, and 1000 times was evaluated. The results obtained by repeating this result for each condition are shown in Tables 1 to 8.
　表１から表８において、「切断面」の欄の評価に関して、１０００回目カット時の切断箇所（最後の切断箇所）をマイクロスコープにおいて観察した結果、切断筋が３本以下であれは「Ａ」、４本以上であれば「Ｂ」とした。 In Tables 1 to 8, regarding the evaluation in the "cut surface" column, as a result of observing the cut point at the 1000th cut (the last cut point) with a microscope, if there are 3 or less cut lines, it is rated "A". , if there were four or more, it was rated "B".
　歪みの指標となるＫＡＭ値については、０以上４．０以下において、欠けによる切断筋が３個以内で良好な切断結果が得られた。好ましいＫＡＭ値の範囲は０．３以上４．０以下である。より良い範囲としてはＫＡＭ値の範囲は０．３以上２．１である。最も好ましいのは０．３以下である。ただし、ＫＡＭ値を０以上０．３未満の範囲とするにはコスト高であるため、上記の実施例ではＫＡＭ値を０．３以上としている。すなわち、性能のみをみればＫＡＭ値を０．３未満とすることが好ましい。 Regarding the KAM value, which is an index of distortion, good cutting results were obtained when the KAM value was 0 or more and 4.0 or less, with no more than 3 cutting lines due to chipping. The preferable KAM value range is 0.3 or more and 4.0 or less. A better range of KAM values is 0.3 to 2.1. The most preferable value is 0.3 or less. However, setting the KAM value to a range of 0 or more and less than 0.3 is expensive, so in the above embodiment, the KAM value is set to 0.3 or more. That is, considering only performance, it is preferable to set the KAM value to less than 0.3.
　表１から８の「欠け幅」の欄において、該当する欠け幅の欠けの数を示している。「１０μｍ～」の欄には９．５μｍを超える幅の欠けの数、「６μｍ～９μｍ」の欄には６．５μｍを超え９．５μｍ以下の幅の欠けの数、「３μｍ～５μｍ」の欄には２．５μｍを超え５．５μｍ以下の幅の欠けの数を示している。 In the "Chip Width" column of Tables 1 to 8, the number of chips with the corresponding chip width is shown. The column "10μm ~" is the number of chips with a width exceeding 9.5μm, the column "6μm ~ 9μm" is the number of chips with a width exceeding 6.5μm and 9.5μm or less, and the column "3μm ~ 5μm" is the number of chips with a width exceeding 9.5μm. The column shows the number of chips with a width of more than 2.5 μm and less than 5.5 μm.
　ＫＡＭ値については、０．３以上４．０以下の範囲において、欠けの数に関して良好な切断結果が得られた。より良い範囲としてはＫＡＭ値の範囲は０．３以上２．１以下である。 Regarding the KAM value, good cutting results were obtained in terms of the number of chips in the range of 0.3 or more and 4.0 or less. A better range of KAM values is 0.3 or more and 2.1 or less.
　今回開示された実施の形態および実施例はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The embodiments and examples disclosed this time should be considered to be 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 equivalent meanings and all changes within the scope of the claims are included.
　１　超硬合金製切断刃、２　刃先部、３　連結部、４　基部、５　切断刃固定部、１００　被切断物、２０１，２０２，２０３，２０４　刃面、２１０　刃先。 1 Cemented carbide cutting blade, 2 Blade tip, 3 Connection part, 4 Base, 5 Cutting blade fixing part, 100 Object to be cut, 201, 202, 203, 204 Blade surface, 210 Blade tip.

Claims (5)

  1. 　基部と、前記基部の延長線上に設けられ、最先端部である刃先を有する刃部とを備え、前記刃先を形成する左右刃面を構成するＷＣ粒子の歪みであるＫＡＭ値が０以上４．０以下である、超硬合金製切断刃。 The KAM value, which is the distortion of the WC particles constituting the left and right blade surfaces that form the cutting edge, is 0 or more and 4. comprises a base and a blade part that is provided on an extension of the base and has a cutting edge that is the cutting edge, and has a KAM value of 0 or more.4. 0 or less, a cutting blade made of cemented carbide.
  2. 　前記ＫＡＭ値が０．３以上４．０以下である、請求項１に記載の超硬合金製切断刃。 The cemented carbide cutting blade according to claim 1, wherein the KAM value is 0.3 or more and 4.0 or less.
  3. 　前記ＫＡＭ値が０．３以上２．１以下である、請求項２に記載の超硬合金製切断刃。 The cemented carbide cutting blade according to claim 2, wherein the KAM value is 0.3 or more and 2.1 or less.
  4. 　超硬合金中のコバルトの含有率が３質量％以上２５質量％の範囲である、請求項１から３のいずれか１項に記載の超硬合金製切断刃。 The cemented carbide cutting blade according to any one of claims 1 to 3, wherein the content of cobalt in the cemented carbide is in the range of 3% by mass or more and 25% by mass.
  5. 　超硬合金の硬度はビッカース硬度Ｈｖ１３００以上、２０３０以下である、請求項１から４のいずれか１項に記載の超硬合金製切断刃。 The cemented carbide cutting blade according to any one of claims 1 to 4, wherein the hardness of the cemented carbide is a Vickers hardness of Hv1300 or more and Hv2030 or less.
PCT/JP2023/009816 2022-03-18 2023-03-14 Cutting blade made of super-hard alloy WO2023176819A1 (en)

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JP2015101747A (en) * 2013-11-22 2015-06-04 住友電気工業株式会社 Cemented carbide and surface-coated cutting tool prepared using the same
WO2017057266A1 (en) * 2015-09-29 2017-04-06 京セラ株式会社 Bar stock and cutting tool
JP2021160017A (en) * 2020-03-31 2021-10-11 株式会社タンガロイ Coated cutting tool
WO2021256282A1 (en) * 2020-06-19 2021-12-23 株式会社アライドマテリアル Cemented carbide cutting blade

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JP2993899B2 (en) 1997-02-05 1999-12-27 ユーエイチティー株式会社 Cutting blade and its forming method
JP4259044B2 (en) 2002-06-14 2009-04-30 株式会社村田製作所 Cutting blade and blade surface machining method
FR2995237B1 (en) 2012-09-07 2015-05-01 Airbus Operations Sas IMPROVED FRICTION MIXING WELDING SYSTEM COMPRISING MOBILE BACK SUPPORT.

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Publication number Priority date Publication date Assignee Title
JP2015101747A (en) * 2013-11-22 2015-06-04 住友電気工業株式会社 Cemented carbide and surface-coated cutting tool prepared using the same
WO2017057266A1 (en) * 2015-09-29 2017-04-06 京セラ株式会社 Bar stock and cutting tool
JP2021160017A (en) * 2020-03-31 2021-10-11 株式会社タンガロイ Coated cutting tool
WO2021256282A1 (en) * 2020-06-19 2021-12-23 株式会社アライドマテリアル Cemented carbide cutting blade

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