WO2021256280A1 - 超硬合金製切断刃 - Google Patents
超硬合金製切断刃 Download PDFInfo
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- WO2021256280A1 WO2021256280A1 PCT/JP2021/021202 JP2021021202W WO2021256280A1 WO 2021256280 A1 WO2021256280 A1 WO 2021256280A1 JP 2021021202 W JP2021021202 W JP 2021021202W WO 2021256280 A1 WO2021256280 A1 WO 2021256280A1
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- WIPO (PCT)
- Prior art keywords
- blade
- cutting
- cutting edge
- cemented carbide
- cut
- Prior art date
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- 238000005520 cutting process Methods 0.000 title claims description 150
- 239000000463 material Substances 0.000 description 24
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 9
- 239000010941 cobalt Substances 0.000 description 8
- 229910017052 cobalt Inorganic materials 0.000 description 8
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 4
- 229910003468 tantalcarbide Inorganic materials 0.000 description 4
- 230000001154 acute effect Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 229910003470 tongbaite Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910034327 TiC Inorganic materials 0.000 description 1
- -1 TiCN Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000012887 quadratic function Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- 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
- B23D35/001—Tools for shearing machines or shearing devices; Holders or chucks for shearing tools cutting members
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
-
- 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
Definitions
- the cutting blade has been, for example, Japanese Patent Application Laid-Open No. 10-217181 (Patent Document 1), Japanese Patent Application Laid-Open No. 2001-158016 (Patent Document 2), International Publication No. 2014/050883 (Patent Document 3), International Publication No. 2014. / 050884 (Patent Document 4), JP-A-2017-4-2911 (Patent Document 5) and JP-A-2004-17444 (Patent Document 6).
- Patent Document 1 Japanese Patent Application Laid-Open No. 10-217181
- Patent Document 2 Japanese Patent Application Laid-Open No. 2001-158016
- Patent Document 3 International Publication No. 2014/050883
- Patent Document 4 International Publication No. 2014. / 050884
- JP-A-2017-4-2911 Patent Document 5
- JP-A-2004-17444 Patent Document 6
- the super hard alloy cutting blade of the present disclosure includes a base portion and a blade portion provided on an extension line of the base portion and having a cutting edge which is the most advanced portion, and has a Vickers hardness HV of 1250 or more and 2030 or less in the blade crossing direction.
- the cutting edge is the coordinate origin
- the direction from the cutting edge to the base is the Z-axis direction
- the direction orthogonal to the Z-axis direction and the blade crossing direction is the Y-axis direction
- the outer surface of the cutting edge is represented by the YZ plane.
- Y2, Z2 ( 5.00 ⁇ m))
- the directional thickness T1 is 0.60 ⁇ m or more and 1.50 ⁇ m or less.
- T1 is 0.60 ⁇ m or more and 0.91 ⁇ m or less, 0.30 ⁇ b / a ⁇ 1.52T1-0.61, and when T1 is 0.91 ⁇ m or more and 1.06 ⁇ m, 0.64T1-0.28 ⁇ b / a. ⁇ 1.52T1-0.61, and 0.64T1-0.28 ⁇ b / a ⁇ 1.00 when T1 is 1.06 ⁇ m or more and 1.50 ⁇ m.
- FIG. 1 is a vertical cross-sectional view of a cemented carbide cutting blade 1 according to the first embodiment.
- FIG. 2 is a vertical cross-sectional view of the cemented carbide cutting blade 1 according to the second embodiment.
- FIG. 3 is a vertical cross-sectional view of the cemented carbide cutting blade 1 according to the third embodiment.
- FIG. 4 is a perspective view of an apparatus for explaining a cutting test.
- FIG. 5 is a cross-sectional view taken along the line VV in FIG. FIG.
- FIG. 7 is a microscope observation image showing a chipping of the cutting blade.
- FIG. 1 is a vertical cross-sectional view of a cemented carbide cutting blade 1 according to the first embodiment.
- the cemented carbide cutting blade 1 has a cutting edge 121t extending in the blade crossing direction.
- FIG. 1 is a vertical cross section in a direction orthogonal to the blade crossing direction.
- the flat-blade-shaped cemented carbide cutting blade 1 has a base portion 110 and a blade portion 120 which is a cutting execution portion.
- a connecting portion may be provided between the base portion 110 and the blade portion 120.
- the material used for the cemented carbide cutting blade 1 is a cemented carbide containing tungsten carbide and cobalt as main components.
- the content of cobalt used in cemented carbide ranges from 3 to 25% by mass.
- the cobalt content is preferably in the range of 5 to 20% by mass.
- the composition of the constituent elements in the cemented carbide is specified by ICP emission spectroscopic analysis and Co titration.
- the cemented carbide in the present disclosure may contain elements such as chromium, vanadium, tantalum, and niobium in order to adjust the characteristics such as particle size, in addition to the main components tungsten carbide and cobalt.
- the size of the tungsten carbide crystals in the cemented carbide is preferably 0.1 ⁇ m to 4 ⁇ m. It is more preferable that the crystal size is 2 ⁇ m or less.
- the cemented carbide has a component TaC (tantalum carbide) for suppressing the growth of crystal grains of tungsten carbide, and the content thereof is 0.1 to 2% by mass.
- the additive for suppressing the grain growth may be V 8 C 7 (vanadium carbide) or Cr 3 C 2 (chromium carbide). At least one of TaC, V 8 C 7 , and Cr 3 C 2 can be replaced and combined. In that case, the content of each is 0.1 to 2% by mass.
- the Vickers hardness HV of cemented carbide is 1250 or more and 2030 or less. Vickers hardness is measured by a Vickers hardness tester. When the Vickers hardness is less than 1250, the deformation resistance as a material becomes small, and it becomes difficult to satisfy the buckling resistance and the vertical cutting property which are important in cutting. When the Vickers hardness exceeds 2030, even if the structure and the ridgeline at the tip of the blade are smooth, the hardness is high and chipping is likely to occur. In addition, not only the material but also the shape of the tip of the cutting edge is important as a countermeasure against chipping.
- the shape of the cemented carbide cutting blade 1 is basically a rectangular plate shape.
- the shortest side of the board is the thickness.
- the cemented carbide cutting blade 1 includes a base 110 and a blade 120 that is provided on an extension of the base 110 and has a shape that becomes thinner toward the cutting edge 121t, which is the most advanced portion.
- the thickness of the base 110 is constant.
- the base 110 has a thickness of, for example, 50 to 1000 ⁇ m, and the required thickness varies depending on the size of the cut piece to be cut.
- the blade portion 120 for cutting is formed on one side extending from the base portion 110.
- the dimension of the blade portion 120 in the direction from the blade portion 120 toward the base portion 110 (Z-axis direction) is expressed as the length or height of the blade portion 120.
- the dimension in the direction perpendicular to the blade crossing direction and the length direction of the blade portion 120 (Y-axis direction) is expressed as the thickness of the blade portion 120.
- the outer shape of the blade portion 120 has a portion of convex 120t in the outward direction within a range of 5.00 ⁇ m from the cutting edge, and the convex 120t portion is the distance in the length direction from the cutting edge 121t and the cutting edge 121t. Is located outside the straight line S connecting the positions of Z2 (5.00 ⁇ m). Since the convex 120t portion is present, the strength of the blade portion 120 can be increased as compared with the straight-shaped cutting blade in which the convex 120t portion is not present.
- the outer surface 121s has a curved shape.
- the angle formed by the two outer surfaces 121s located at positions facing each other increases as the cutting edge approaches the cutting edge 121t.
- the outer surface 121s is symmetrical with respect to the center line C.
- the outer surface 121s may be asymmetrical with respect to the center line C.
- the inclination of the outer surface 121s is different between the point 1201 at the distance Z1 from the cutting edge 121t and the point 1203 at the distance Z2 from the cutting edge 121t.
- the object to be cut by the cemented carbide cutting blade 1 is, for example, a ceramic green sheet before firing such as a laminated capacitor or a laminated inductor, a metal foil, paper, fiber, or a hard resin.
- the present inventor has focused on a quadratic function that passes through a specific point of the blade portion 120 in order to prevent the cutting edge 121t from being chipped.
- the vertical cross section is the YZ plane, and the cutting edge 121t is the coordinate origin (0,0).
- Y1 T1 / 2.
- the points on the outer shape of the blade portion 120 are (Y11, Z1) and (Y12, Z1). Compare Y11 and Y12, and let Y1 be the one with the larger absolute value.
- the value of b / a is 0.30 or more and 1.00 or less. If it is less than 0.30, it indicates that the cutting edge angle ⁇ obtained from the two front and back cutting surfaces is large, the cutting resistance on the cutting surface increases, the spreading force during cutting increases, and the cut object cracks. There is a risk of causing.
- b / a exceeds 1.00, it means that the tip of the cutting edge is relatively flat, the angle ⁇ of the tip of the cutting edge obtained from the two front and back cutting surfaces is small, and the sharpness of the tip of the cutting edge becomes dull, and at the time of cutting. There is a risk that the impact will be applied to the tip and it will be easily chipped.
- the thickness T1 of the blade portion in Z1 is 0.60 ⁇ m or more and 1.50 ⁇ m or less. If T1 is less than 0.60 ⁇ m, there is a risk that the blade portion becomes thin and easily chipped. If T1 exceeds 1.50 ⁇ m, the blade portion becomes too thick and the cutting resistance increases.
- T1 is 0.60 ⁇ m or more and 0.91 ⁇ m or less, 0.30 ⁇ b / a ⁇ 1.52T1-0.61, and when T1 is 0.91 ⁇ m or more and 1.06 ⁇ m, 0.64T1-0.28 ⁇ b / a. ⁇ 1.52T1-0.61, and 0.64T1-0.28 ⁇ b / a ⁇ 1.00 when T1 is 1.06 ⁇ m or more and 1.50 ⁇ m. If it is out of this range, the strength of the cutting edge is reduced and the cutting edge is likely to be chipped, or the cutting resistance is increased and the cut surface of the object to be cut becomes rough.
- the outer surface 121s of the blade portion 120 is located outside the straight line s connecting the coordinate origin and the point (Y2, Z2).
- the present disclosure mainly relates to a flat blade-shaped cutting blade that pushes and cuts an object to be cut such as a ceramic green sheet (hereinafter also referred to as a green sheet) of a multilayer ceramic capacitor.
- a flat blade-shaped cutting blade that pushes and cuts an object to be cut such as a ceramic green sheet (hereinafter also referred to as a green sheet) of a multilayer ceramic capacitor.
- the cemented carbide cutting blade has a shape having a cutting execution portion that contributes to cutting, that is, a cutting edge portion and a base portion (also referred to as a shank) having parallel surfaces for fixing the cutting blade to the cutting device. More specific required properties include sharpness, wear resistance, welding resistance to the object to be cut, strength against buckling, and long life.
- the shape of the cutting edge is particularly important, and considering damage to the object to be cut, it is better to have a thin blade and a small angle at the tip of the cutting edge (acute angle). However, it is inevitable that the strength deteriorates as the blade becomes thinner. Therefore, the cutting blades currently used have been devised to increase the cutting edge angle at the cutting edge by providing a one-step or multiple-step angle between the cutting edge and the base.
- hard materials such as cemented carbide are used in addition to high carbon steel, for example.
- cemented carbide is used in addition to high carbon steel, for example.
- the outer shape is curved so that the width of the blade portion becomes narrower as it approaches the cutting edge in the vertical cross section.
- the curved shape may have a single radius of curvature, or may be a so-called composite R shape having a plurality of radii of curvature.
- the present disclosure optimizes the combination of the above, the material, and the shape of the cutting edge, that is, the blade thickness, which are factors that affect chipping, and found that chipping is likely to occur by satisfying all of these. It is a thing.
- the cutting edge 121t is sharp, but there is a risk in the occurrence of chipping, and in order to further reduce this risk, it is effective that the tip of the blade 120 has a curved surface. be. It is clear that the cutting edge 121t wears as the cutting continues, and it is more desirable that the cutting edge 121t satisfies the above-mentioned ranges of b / a and T1 and is rounded.
- the same effect can be obtained even if the blade surface of the blade portion 120, which is a cutting execution portion formed in the direction of the base portion 110, has one blade surface or a plurality of blade surfaces. Further, the same effect can be obtained when the outer shape is composed of a straight line in the vertical cross-sectional shape, or even if the outer shape is partially curved.
- the method of processing the blade portion 120 to obtain the above shape is, for example, by polishing with a grindstone as in the conventional method. Further, a blast method can be used as a method for forming a minute curved surface. Further, a minute curved surface can be formed by cutting a softer surface than the object to be cut, for example, a viscosity in which an abrasive is dispersed.
- the hard material in the solid material containing a hard abrasive and the blade portion 120 are brought into contact with each other for processing.
- the blade portion 120 can be formed.
- examples of the solid substance containing a hard abrasive include a clayey material.
- examples of hard materials include powders of diamond, W, Mo, WC, Al 2 O 3 , TiO 2 , TiC, TiCN, SiC, Si 3 N 4 , BN and the like.
- the average particle size of the secondary particles is 1 ⁇ m or less in the Fsss (Fisher Sub-Sieve Sizer) particle size.
- Fsss Fisher Sub-Sieve Sizer
- the method for manufacturing the cemented carbide cutting blade 1 is not limited to the above.
- FIG. 2 is a vertical cross-sectional view of the cemented carbide cutting blade 1 according to the second embodiment. As shown in FIG. 2, in the cemented carbide cutting blade 1 according to the second embodiment, the second portion 122 exists in a portion where the distance from the cutting edge 121t exceeds Z2 (5.00 ⁇ m).
- FIG. 3 is a vertical cross-sectional view of the cemented carbide cutting blade 1 according to the third embodiment. As shown in FIG. 3, it differs from the cemented carbide cutting blade 1 according to the first embodiment in that there is a point where the inclination of the outer surface 121s changes discontinuously in the vicinity of the height Z1.
- FIG. 4 is a perspective view of an apparatus for explaining a cutting test.
- FIG. 5 is a cross-sectional view taken along the line VV in FIG.
- the super hard alloy cutting blade 1 (flat blade-shaped cutting blade) used in the test has a blade crossing direction (X-axis direction) of 40 mm, a base thickness (Y-axis direction) of 0.1 mm, and a blade height (Z-axis direction) of 22. It was 0 mm, and the blade processing height of the cutting execution portion (height of the blade portion 120 in the Z-axis direction) was 2.0 mm.
- the basic composition of the material is tungsten carbide and cobalt, and the particle size of tungsten carbide is adjusted by using metal carbides such as chromium carbide, vanadium carbide, and tantalum carbide as additives, and the amount of cobalt added is adjusted to bake the cemented carbide. I got a bond.
- metal carbides such as chromium carbide, vanadium carbide, and tantalum carbide
- the amount of cobalt added is adjusted to bake the cemented carbide. I got a bond.
- a cemented carbide material having a Vickers hardness of 1580 was used. To change the hardness, the particle size of tungsten carbide was adjusted and the amount of cobalt added was adjusted.
- the manufactured sintered body was machined into a plate shape having a thickness of 100 ⁇ m, a blade height of 22 mm, and a length of 40 mm by a grinding machine using a diamond grindstone, and used as a material for processing the tip blade portion.
- the tip blade portion was formed using the above material.
- the material was fixed to a dedicated work rest whose angle could be adjusted using a dedicated grinder using a diamond cylindrical grindstone.
- the processing is performed on the first portion 121 having the tip angle at the most tip with respect to one side in the direction of the long side length of the material, and the second portion 122 which is arranged in a row and continuous with the base 110.
- the blade portion 120 having the above was formed.
- tungsten carbide and cobalt are press-molded with a binder such as paraffin to form a block having a length of 50 mm, a width of 50 mm, and a height of 30 mm.
- the cutting edge was continuously pressed against the block at high speed to form a convex shape.
- the pressing speed, angle, and depth were adjusted. Since it is a very precise process to form a convex shape, it is very important to set precise grinding conditions such as tungsten carbide particles as a cutting medium, pressing speed, and depth.
- the arithmetic average roughness Sa (arithmetic mean height ISO25178) of the outer surfaces 121s and 122s was 0.02 ⁇ m or less.
- the arithmetic mean roughness Sa of the outer surfaces 121s and 122s is measured by using a non-contact type surface roughness measuring device using a white interferometer. Specifically, a non-contact three-dimensional roughness measuring device (Nexview (registered trademark)) manufactured by Zygo Corporation is used, and the measurement range in the vertical cross section is 0.15 mm in the X direction and 0.05 mm in the Z direction. ..
- the magnification of the zoom lens was set to 2 times, and the magnification of the objective lens was set to 50 times.
- ⁇ Cross section confirmation> The cross-sectional confirmation was imaged at 10,000 times using a JEOL Schottky field emission scanning electron microscope JSM-7900F, and the machine coordinates and length measurement function were utilized to make 1.00 ⁇ m from the cutting edge 121t and 1.00 ⁇ m.
- the blade thickness (thickness of the blade portion 120) of the portion of 00 ⁇ m was measured.
- the Vickers hardness was measured using a PICODETOR HM500 manufactured by Fisher Instruments. The results are shown in Tables 1 to 3.
- the "hardness HV” in Tables 1 to 3 refers to the Vickers hardness of the cemented carbide cutting blade 1.
- “B / a” means a value obtained by dividing the constant b by the constant a.
- the “figure” indicates a drawing corresponding to the shape of each sample. In all the samples, it was confirmed that a convex 120t located outside the straight line S exists between the coordinate origin and the point 1203. Furthermore, it was confirmed that all the outer surfaces 121s were located outside the straight line S between the coordinate origin and the point 1203.
- the object to be cut was a generally available PVC plate. It was fixed using an adhesive sheet having a thickness of 0.1 mm or more and 3.0 mm or less. Further, the adhesive sheet has a function of preventing the cutting edge of the cutting edge from coming into contact with the table supporting the object to be cut and chipping during push-cutting.
- the width in the X-axis direction is 30 mm and the thickness in the Z-axis direction is 0.5 mm.
- the cutting speed was set to 300 mm / s in the Z-axis direction.
- Cutting conditions Cutting speed 300 mm / sec, indentation amount 0.55 mm, longitudinal work and blade angle ⁇ 0.5 °, work and blade cross-sectional angle 90 ° ⁇ 0.5 °, number of cuts 100 times (2.5 mm interval) )
- the cemented carbide cutting blade 1 was held by chucks 3001 and 3002 in an apparatus as shown in FIGS. 4 and 5.
- the cemented carbide cutting blade 1 was continuously cut at a descent speed of 30 mm / sec.
- the cutting position can be moved each time the cemented carbide cutting blade 1 is raised so as not to cut the same position of the vinyl chloride plate 100 which is the object to be cut in order to continuously cut.
- the state of the cutting edge after the above cutting was performed 100 times was evaluated by the number of chips generated in the entire blade crossing direction.
- chipping to be counted either the case where the width of the chip is 10 ⁇ m or more or the depth exceeds 3 ⁇ m at the ridgeline portion of the cutting edge is counted as chip (FIG. 7).
- FIG. 7 is a microscope observation image showing a chipping of the cutting blade.
- the entire surface of the 40 mm blade after being cut and cut 100 times was measured with a magnification of 1000 times and observed with a microscope.
- a 50x eyepiece and a 20x objective lens are attached to an Olympus measuring microscope (STM6-LM), and the cutting blade (XZ surface) is placed on a flat surface. Care should be taken so that the cutting edge 121t of the cutting blade shown in FIG. 7 and the measuring stage are parallel to each other.
- STM6-LM Olympus measuring microscope
- the evaluation when the cutting edge 121t was chipped within 5 pieces was "A”
- the evaluation when the chipping was 6 to 20 pieces was "B”
- the evaluation when the chipping was more than 20 pieces was "C”.
- the cut surface evaluation the cut surface was magnified at 50 times for the 100th cut product, and the number of scratches having a length of 30 ⁇ m or more in the cutting direction was counted.
- the evaluation was made on a three-point scale, with 10 or less as "A”, 11 or more and 20 or less as "B", and more than 20 as "C".
- the result of the cutting evaluation is shown in FIG.
- the horizontal axis shows T1 in Tables 1 to 3, and the vertical axis shows b / a.
- the range of is the range where the effect is exhibited. In this range, it can be seen that the results of "A" are obtained in the "state of chipping of the cutting edge" and "cut surface properties" in Tables 1 to 3.
- Cemented carbide cutting blade 100 vinyl chloride plate, 110 base, 120 blade, 120t convex, 121 first part, 121k chipped, 121s, 122s outer surface, 121t cutting edge, 122 second part, 2001 double-sided adhesive sheet, 2002 Acrylic plate, 2003, cutting power meter, 2004 stage, 3001,3002 chuck.
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Abstract
Description
刃厚が薄いと、カット衝撃に刃先が耐えられず、チッピングが発生するという問題があった。刃厚が厚いと、切断抵抗が高く、断面品質悪くなり断面が荒れるという問題があった。
最初に本開示の実施態様を列記して説明する。
図1は、実施の形態1に従った超硬合金製切断刃1の縦断面図である。図1で示すように、超硬合金製切断刃1は刃渡り方向に延びる刃先121tを有する。図1は、刃渡り方向に直交する方向の縦断面である。平刃状の超硬合金製切断刃1は、図1に示すように基部110、および切断実行部である刃部120を有する。基部110と刃部120との間に連結部を有していてもよい。
(材質)
超硬合金製切断刃1に用いた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ある。超硬合金に使用されるコバルトの含有率は3~25質量%の範囲である。コバルトの含有率は5~20質量%の範囲であることが好ましい。超硬合金中を構成する元素の組成の特定は、ICP発光分光分析、Co滴定によって行う。本開示における超硬合金とは主成分タングステンカーバイド、コバルトの他、粒度等の特性調整の為、クロム、バナジウム、タンタル、ニオブ等の元素を含む場合もある。超硬合金中のタングステンカーバイド結晶の大きさが0.1μm~4μmであることが好ましい。結晶の大きさが2μm以下がより好ましい。
超硬合金製切断刃1の形状は基本的に矩形の板形状である。板の最も短い辺を厚さとする。
刃渡り方向に直交する縦断面において刃先から5.00μmの範囲において刃部120の外形が外方向に凸120tの部分を有し、凸120tの部分は刃先121tおよび刃先121tからの長さ方向の距離がZ2(5.00μm)の位置を結ぶ直線Sよりも外側に位置する。凸120tの部分が存在することで凸120tの部分が存在しないストレート形状の切断刃と比較して刃部120の強度を高くすることができる。
図2は、実施の形態2に従った超硬合金製切断刃1の縦断面図である。図2で示すように、実施の形態2に従った超硬合金製切断刃1においては、第二部分122は刃先121tからの距離がZ2(5.00μm)を超える部分に存在する。
図3は、実施の形態3に従った超硬合金製切断刃1の縦断面図である。図3で示すように、高さZ1近傍において、外表面121sの傾斜が不連続に変化する点が存在する点において、実施の形態1に従った超硬合金製切断刃1と異なる。
(実施例1)
図4は、切断試験を説明するための装置の斜視図である。図5は、図4中のV-V線に沿った断面図である。試験に用いる超硬合金製切断刃1(平刃状切断刃)は、刃渡り方向(X軸方向)40mm、基部厚さ(Y軸方向)0.1mm、刃高さ(Z軸方向)22.0mmであり、切断実行部の刃加工高さ(刃部120のZ軸方向高さ)2.0mmとした。材質は炭化タングステンおよびコバルトを基本組成としており、炭化クロム、炭化バナジウム、および炭化タンタル等の金属炭化物を添加剤として炭化タングステンの粒径を調整、更にコバルト添加量を調整して超硬合金の焼結体を得た。一例としてビッカース硬度1580の超硬合金素材を使用した。硬度を変更するには炭化タングステンの粒径調整とコバルトの添加量を調整し行った。
製造された焼結体はダイヤモンド砥石を用いた研削機により厚さ100μm、刃高さ22mm、長さ40mmの板形状に削り出し先端刃部加工用の素材とした。
続いて上記素材を用いて先端刃部の形成加工行った。形成加工に於いてはダイヤモンド円筒砥石を使用した専用の研削機を用い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。刃部が2段である場合には、加工は素材長辺長さ40mm方向の一辺に対して最も先端にある先端角を持つ第一部分121、それに連なり配置され基部110に連続する第二部分122を有する刃部120を形成した。
図2で示すような平面の外表面122sを形成するためには、円筒砥石を用いて最先端部に対して凸形状加工を両面に施した。
図1で示すような凸湾曲面である外表面121sを形成するためには、炭化タングステンとコバルトをパラフィンなどのバインダーでプレス成型し長さ50mm-幅50mm-高さ30mmのブロック状にし、そのブロックに刃先を高速で連続的に押し付け凸型形状を成形した。凸の大きさを調整するには押し付け速度、角度、深さにより調整を行った。凸形状の形成にあたっては非常に精密な加工である為、切断メディアとなる炭化タングステン粒子や押し付け速度、深さなどの緻密な研削条件の設定が非常に肝要である。
断面確認を日本電子社製のショットキー電界放出形走査電子顕微鏡JSM-7900Fを用いて10,000倍にて撮像し、機械座標と測長機能を活用し、刃先121tから1.00μmおよび5.00μmの部分の刃厚(刃部120の厚み)を測定した。ビッカース換算硬さは、フィッシャー・インストルメンツ社製PICODENTOR HM500を用いて測定した。それらの結果を表1から3に示す。
「T1(μm)」とは刃先121tからZ軸方向に1.00μmの位置(Z=Z1)における刃部120のY軸方向の厚みをいう。「T2(μm)」とは刃先121tからZ軸方向に5.00μmの位置(Z=Z2)における刃部120のY軸方向の厚みをいう。
ワーク材質:塩化ビニル板100 厚み0.5mm、幅290mm、長さ30mm、ビッカース換算硬さHVが15
テスト装置:牧野フライス製作所製マシニングセンタV55(ステージ2004)にキスラー製切削動力計9255(切削動力計2003)をセットしたもの
ワークセット:下から厚み10mmのアクリル板2002、厚み1mmの両面粘着シート2001、ワークとしての塩化ビニル板100を積層した。
図4および5に示すような装置にて、チャック3001,3002により超硬合金製切断刃1を保持した。超硬合金製切断刃1の降下速度を30mm/秒として連続的に切断した。ここで連続的に切断するために切断対象物である塩化ビニル板100の同じ位置を切断しないように、超硬合金製切断刃1が上昇するたびに切断位置が移動できるようにした。
Claims (2)
- 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、
ビッカース硬度HVが1250以上2030以下であり、
刃渡り方向に直交する縦断面において、前記刃先を座標原点とし、前記刃先から前記基部に向かう方向をZ軸方向とし、Z軸方向および刃渡り方向に直交する方向をY軸方向とし、前記刃部の外表面をYZ平面で表し、前記外表面の第一の点の座標を(Y1,Z1(=1.00μm))としa=Z1/(Y1)2で定義される定数aと、前記外表面の第二の点の座標を(Y2,Z2(=5.00μm))としb=Z2/(Y2)2で定義される定数bとの比率b/aが0.30以上1.00以下であり、
Z1における前記刃部のY軸方向厚さT1が0.60μm以上1.50μm以下であり、
T1が0.60μm以上0.91μm以下において0.30≦b/a≦1.52T1-0.61であり、
T1が0.91μm以上1.06μmにおいて0.64T1-0.28≦b/a≦1.52T1-0.61であり、
T1が1.06μm以上1.50μmにおいて0.64T1-0.28≦b/a≦1.00である、超硬合金製切断刃。 - Yが0からY2のすべての範囲において、前記刃部の外表面は前記座標原点と点(Y2,Z2)とを結ぶ直線よりも外側に位置する、請求項1に記載の超硬合金製切断刃。
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