WO2016104620A1 - Outil de coupe compact fritté composite et outil de coupe compact fritté composite avec surface revêtue - Google Patents

Outil de coupe compact fritté composite et outil de coupe compact fritté composite avec surface revêtue Download PDF

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Publication number
WO2016104620A1
WO2016104620A1 PCT/JP2015/086053 JP2015086053W WO2016104620A1 WO 2016104620 A1 WO2016104620 A1 WO 2016104620A1 JP 2015086053 W JP2015086053 W JP 2015086053W WO 2016104620 A1 WO2016104620 A1 WO 2016104620A1
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Prior art keywords
cutting tool
cemented carbide
composite sintered
ticn
layer
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PCT/JP2015/086053
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English (en)
Japanese (ja)
Inventor
五十嵐　誠
晃浩 村上
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三菱マテリアル株式会社
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Priority claimed from JP2015250733A external-priority patent/JP6614491B2/ja
Application filed by 三菱マテリアル株式会社 filed Critical 三菱マテリアル株式会社
Priority to EP15873188.5A priority Critical patent/EP3238866B1/fr
Priority to CN201580070215.3A priority patent/CN107107204B/zh
Priority to US15/538,562 priority patent/US10569338B2/en
Publication of WO2016104620A1 publication Critical patent/WO2016104620A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material

Definitions

  • the present invention relates to a cutting tool composed of a composite sintered body of a TiCN-based cermet and a WC-based cemented carbide, and in particular, the amount of deformation of the sintered body during sintering is reduced while reducing the amount of rare metal tungsten used.
  • the present invention relates to a cutting tool that has excellent heat cracking resistance with reduced heat resistance.
  • WC-based cemented carbide is widely used as a tool for cutting steel and cast iron, but various proposals have been made in order to reduce the amount of rare metal tungsten used and obtain the desired cutting performance. Has been made.
  • a cemented carbide layer and a cermet layer containing WC and W in total of 15 to 65% by mass or less and 80% by mass or more of the iron group metal in the binder phase are Co.
  • the base material has a maximum thickness in the stacking direction of h1, and a maximum thickness in the stacking direction of the cemented carbide layer of the cutting edge portion is set to h2, h2 / h1 is 0.002 to By making it 0.02, a composite sintered body cutting tool with improved impact resistance and finished surface gloss has been proposed.
  • Patent Document 2 includes a cemented carbide layer and a cermet layer containing WC and W in a total amount of 15 to 65% by mass or less, and 80% by mass or more of the iron group metal in the binder phase being Co.
  • a cutting tool made of a laminated base material an uneven portion having a maximum drop of 50 ⁇ m to 500 ⁇ m is formed at the boundary between the cemented carbide layer and the cermet layer, and the maximum thickness in the stacking direction of the base material is h1
  • h2 / h1 is set to be more than 0.02 and less than 0.4, so that the distance between the cemented carbide layer and the cermet layer
  • a composite sintered body cutting tool that improves the bondability of the material and suppresses deformation of the base material after sintering.
  • press-molded bodies are formed from cemented carbide powder and cermet powder, and the press-molded bodies are stacked and held at 1300 to 1500 ° C. for 0.5 to 3 hours in a vacuum atmosphere.
  • a tool base by performing sintering, by setting the uneven state of the boundary between the cemented carbide layer and the cermet layer to a specific range, or adjusting the amount of the binder phase of both layers to a specific range, It has been proposed to improve the wear resistance and toughness of a composite sintered compact cutting tool by enhancing the bondability between cemented carbide and cermet, and suppressing deformation that occurs during sintering.
  • the amount of tungsten used is reduced to some extent, but 15% by mass or more of W and WC are required in the cermet. Chipping is not enough to reduce the amount of tungsten used, and when such a cutting tool is used for wet interrupted cutting, not only the strength and toughness but also the thermal crack resistance is insufficient. There is a problem that abnormal damage such as defects is easily broken. Further, in the composite sintered body composed of the cemented carbide and the cermet shown in Patent Document 3, it is necessary to form irregularities at the boundary between the cemented carbide layer and the cermet layer, and the composite is less deformed at the time of sintering.
  • the amount of tungsten used can be reduced. At most, it is only about 30%, which is not fully satisfactory from the viewpoint of resource saving, but under cutting conditions that receive a severe thermal history such as wet interrupted cutting, the cemented carbide of the cutting edge is caused by the progress of cracks, etc. There was a fear of destruction, and it could not be said to be reliable enough.
  • An object of the present invention is to provide a cutting tool that has an effect of suppressing crack propagation even when used for intermittent cutting in which a shocking high load acts, and has excellent abnormal damage resistance.
  • the inventors of the present application aim to reduce the amount of tungsten used in a composite sintered body cutting tool having a composite sintered body made of a TiCN-based cermet and a WC-based cemented carbide as a tool base. Even when used for interrupted cutting where intermittent and impactful high loads are applied to the cutting edge, it has excellent crack propagation / development suppressing action, and it can cause abnormal damage such as chipping, chipping and peeling over a long period of use. As a result of intensive studies on cutting tools that do not occur, the following findings were obtained.
  • a composite sintered compact cutting tool of TiCN-based cermet and WC-based cemented carbide if the rake face including the cutting edge of the tool is formed of a WC-based cemented carbide layer, the heat during sintering of the composite sintered compact The generation of compressive stress due to the difference in expansion coefficient improves the intermittent cutting performance of the tool.
  • the deformation behavior of the TiCN-based cermet during sintering depends on the interface between the TiCN-based cermet and the WC-based cemented carbide layer and the TiCN.
  • the cermet central portion has a larger amount of shrinkage than the interface portion with the WC-based cemented carbide layer, so that a large deformation (dent) occurs in the cermet central portion of the composite sintered body.
  • the inventors of the present application can reduce the deformation of the cermet central portion by adjusting the composition of the TiCN-based cermet used, thereby preventing the finish surface accuracy of the work material from being deteriorated. They found that the heat cracking resistance of the cutting tool can be improved, and that the amount of tungsten, which is a rare metal, can be reduced.
  • the crack propagation / removal in wet intermittent cutting such as alloy steel in which intermittent and impact high loads and thermal loads act on the cutting edge is also possible. It has been found that progress is prevented and that excellent abnormal damage resistance and wear resistance are exhibited over a long period of use.
  • a cutting tool comprising a composite sintered body of a TiCN-based cermet layer and a WC-based cemented carbide layer, (A) The angle formed by the rake face and the flank face of the cutting tool is 90 degrees, (B) The rake face including the cutting edge of the cutting tool is a WC-based cemented carbide layer containing 4 to 17% by mass of an iron group metal component, 75% by mass or more of W, and WC as a main hard phase component.
  • the thickness of the WC-based cemented carbide layer is 0.05 to 0.3 times the thickness of the composite sintered body
  • the TiCN-based cermet layer is composed of one TiCN-based cermet layer, and when the content ratio of the constituent components of the cermet layer is expressed by the content ratio of the metal component, at least the iron group metal component is 4 to 25 Co and Ni which are iron group metal components, containing less than 15% by weight, less than 15% by weight of W, 2 to 15% by weight of Mo, 2 to 10% by weight of Nb and 0.2 to 2% by weight of Cr.
  • the Co content ratio with respect to the total content of Co and Ni satisfies 0.5 to 0.8 (however, the mass ratio), (E) In the plane that passes through the center of the rake face of the cutting tool and is perpendicular to both the rake face and the flank face, the flank passes through the ridge line intersecting the rake face and the flank face, and the line perpendicular to the rake face is used as a reference line.
  • the value of the maximum height difference of the height profile is 0.01 or less with respect to the thickness from the front surface to the rear surface of the rake face in the composite sintered body.
  • the composite sintered compact cutting tool characterized by the ratio.
  • the composite sintered compact cutting tool according to (1) wherein the rake face of the composite sintered compact cutting tool has a polygonal shape or a circular shape in plan view.
  • the WC-based cemented carbide layer constituting the rake face of the composite sintered body cutting tool is formed on the surface of the TiCN-based cermet layer or on the front and back surfaces (1) ) Or the composite sintered compact cutting tool according to (2).
  • a hard coating layer is formed on the surface of the WC-based cemented carbide constituting at least the rake face of the composite sintered body cutting tool comprising the TiCN-based cermet layer and the WC-based cemented carbide layer.
  • the composite sintered body cutting tool (hereinafter referred to as “the composite sintered body cutting tool of the present invention” or “the cutting tool of the present invention”), which is an embodiment of the present invention, is composed of a TiCN-based cermet and a WC-based cemented carbide.
  • the schematic model diagram of the composite sintered compact cutting tool of the present invention is shown, and a side view of one example of the composite sintered compact cutting tool of the present invention is shown.
  • the schematic schematic diagram of the composite sintered compact cutting tool of this invention is shown, and the side view of the other example of the composite sintered compact cutting tool of this invention is shown.
  • One example (polygonal shape) of the planar shape of the rake face of the composite sintered compact cutting tool of the present invention is shown.
  • the other example (circular shape) of the planar shape of the rake face of the composite sintered compact cutting tool of the present invention is shown.
  • a schematic diagram of a surface-coated composite sintered body cutting tool in which a hard coating layer is deposited on the surface of the composite sintered body cutting tool of the present invention is shown.
  • the side view of is shown.
  • Another example of the surface-coated composite sintered body cutting tool of the present invention is shown in a schematic diagram of the surface-coated composite sintered body cutting tool having a hard coating layer formed on the surface of the composite sintered body cutting tool of the present invention.
  • the side view of is shown.
  • regulated by this invention is shown.
  • FIG. 1A to FIG. 1D show schematic schematic views of the composite sintered body cutting tool 1 of the present invention.
  • FIG. 1A shows a side view of one example of the composite sintered body cutting tool 1 of the present invention.
  • FIG. 1B shows a side view of another example of the composite sintered compact cutting tool 1 of the present invention.
  • FIG. 1C shows one example (polygonal shape) 6 of the planar shape of the rake face of the composite sintered compact cutting tool 1 of the present invention.
  • FIG. 1D shows another example (circular shape) 7 of the planar shape of the rake face of the composite sintered compact cutting tool 1 of the present invention.
  • FIGS. 1A shows a side view of one example of the composite sintered body cutting tool 1 of the present invention.
  • FIG. 1B shows a side view of another example of the composite sintered compact cutting tool 1 of the present invention.
  • FIG. 1C shows one example (polygonal shape) 6 of the planar shape of the rake face of the composite sin
  • the cutting tool 1 is not composed of a WC-based cemented carbide alloy as a whole but a rake face 4 including a cutting edge including a TiCN-based cermet layer 2 as a base.
  • a rake surface comprising the WC-based cemented carbide layer 3 on the front and back surfaces of the TiCN-based cermet layer 2 is provided. 4 is formed, when one of the rake face is damaged and the amount of wear becomes severe, the rake face 4 including a new cutting edge appears by reversing the front and back surfaces of the tool, and the cutting is performed. Processing can be continued.
  • the cutting tool 1 of the present invention it is not always necessary to form the rake face 4 on both the front and back surfaces of the TiCN-based cermet layer 2, and the rake face 4 may be formed on at least one of the front and back faces. Further, the cutting tool 1 of the present invention is such that when the rake face 4 has a polygonal shape (in FIG. 1C, a square or a rhombus) as shown in FIG. If the plane shape of the rake face 4 is circular (including an ellipse) as shown in FIG. 1D, any position on the circumference can be used as a cutting edge. it can.
  • the flank 5 is a side surface of the cutting tool orthogonal to the rake face 4 at 90 °, and a cutting edge of the cutting tool is formed on a ridge line where the flank 5 and the rake face 4 intersect.
  • 2A and 2B are schematic views of a surface-covered composite sintered body cutting tool in which a hard coating layer 8 is formed on the surface of the composite sintered body cutting tool 1 of the present invention, and FIG. 2A is the present invention. The side view of one example of the surface covering compound sintered compact cutting tool 1 of this is shown. Moreover, FIG. 2B shows the side view of the other example of the surface covering composite sintered compact cutting tool 1 of this invention. As shown in FIGS.
  • the cutting tool of the present invention can be used as a surface-coated composite sintered cutting tool by depositing a hard coating layer 8 on the surface of the cutting tool.
  • 2A shows a cutting tool in which a rake face 4 made of a WC-base cemented carbide is formed only on one surface of a TiCN-based cermet, and a hard coating layer 8 is formed on the rake face 4 by vapor deposition.
  • FIG. 3 is a schematic explanatory diagram of the flank height profile and the maximum height difference 10 defined by the cutting tool of the present invention.
  • Composite sintered body cutting tool of the present invention (hereinafter, “composite sintered body cutting tool” is also referred to as “cutting tool”), surface coated composite sintered body cutting tool (hereinafter, “surface coated composite sintered body cutting tool”) Can also be produced by the following production method.
  • a TiCN-based cermet powder having a predetermined composition and a WC-based cemented carbide powder having the same predetermined composition are prepared, and these powders are pressed to laminate a TiCN-based cermet and a WC-based cemented carbide.
  • this composite molded body is sintered under a condition of 1420 ° C.
  • the composite sintered body cutting tool of the present invention can be produced by processing the bonded body into a predetermined shape.
  • a Ti compound layer, a composite nitride layer of Ti and Al can be manufactured by vapor-depositing a hard coating layer such as an Al 2 O 3 layer as a single layer or as a multilayer coating of a plurality of layers.
  • the TiCN-based cermet layer 2 used in the present invention is a cermet containing TiCN as a main hard component and 4 to 25% by mass of an iron group metal (for example, Co, Ni, Fe) component as a main binder phase component.
  • an iron group metal for example, Co, Ni, Fe
  • W is less than 15% by mass
  • Mo is 2 to 15% by mass
  • Nb is 2 to 10% by mass
  • Cr is 0.2 to 2% by mass
  • the ratio of Co content to the total content of Co and Ni is 0.5 to 0.8.
  • the W content in the TiCN-based cermet increases, the characteristics of the TiCN-based cermet approach the WC-based cemented carbide, so that sintering as a composite becomes easier, but it is contained as intended in the present invention.
  • the W content is determined to be less than 15% by mass because it is a component element that requires a reduction in the amount.
  • the W content is 0% by mass to 12% by mass, more preferably 0% by mass to 8% by mass, but this is not particularly limited.
  • Mo is a component element that has the effect of increasing the wettability between the hard phase and the binder phase and improving the sinterability in the TiCN-based cermet, but if its content is less than 2% by mass, the effect of improving the wettability On the other hand, if the content exceeds 15% by mass, Mo dissolves in the hard phase and the strength and toughness are lowered. Therefore, the Mo content is determined to be 2 to 15% by mass. Preferably, the Mo content is 3% by mass to 14% by mass, more preferably 7% by mass to 10% by mass, but this is not particularly limited.
  • Nb has the effect of improving the high-temperature oxidation resistance of TiCN-based cermets, but if its content is less than 2% by mass or exceeds 10% by mass, the effect of improving high-temperature oxidation resistance is reduced. Therefore, the Nb content is determined to be 2 to 10% by mass. Preferably, the Nb content is 3% by mass to 9% by mass, more preferably 4% by mass to 8% by mass, but this is not particularly limited.
  • Cr has the effect of bringing the sintering temperature of the TiCN-based cermet closer to that of the WC-based cemented carbide, but if its content is less than 0.2% by mass, the effect is not sufficient, while its content is 2 When the content exceeds 20% by mass, a free phase of Cr 3 C 2 precipitates and lowers the toughness of the sintered body. Therefore, the Cr content is determined to be 0.2 to 2% by mass. Preferably, the Cr content is 0.5 mass% to 1.7 mass%, more preferably 0.8 mass% to 1.4 mass%, but this is not particularly limited.
  • Co is an iron group metal component and is a binder phase component in the TiCN-based cermet, but in the relationship with Ni, which is also an iron group metal component, the Co content ratio (Co / (Co + Ni)) must be in the range of 0.5 to 0.8 (mass ratio).
  • the content ratio of Co to the total content of Co and Ni (Co / (Co + Ni)) is less than 0.5, the TiCN-based cermet and the WC-based cemented carbide composite body are sintered when the TiCN-based composite body is sintered.
  • the Ni component in the cermet layer 2 diffuses into the WC-based cemented carbide layer 3 to reduce the high-temperature hardness of the WC-based cemented carbide layer 3, while the Co content relative to the total content of Co and Ni
  • the ratio (Co / (Co + Ni)) exceeds 0.8, the toughness of the TiCN-based cermet layer 2 is lowered, and the composite sintered body may be damaged. Therefore, for Co and Ni which are components contained in the TiCN-based cermet layer 2, the Co content ratio (Co / (Co + Ni)) to the total content of Co and Ni is 0.5 to 0.8 (provided that (Mass ratio).
  • the content ratio of Co to the total content of Co and Ni is 0.6 to 0.7 in terms of mass ratio, but is not particularly limited thereto.
  • the WC-based cemented carbide constituting the composite sintered body with the TiCN-based cermet is composed of WC as a main hard phase component and an iron group metal (for example, Co, Ni, Fe) as a main binder phase component.
  • the binder phase component is firmly bonded to the hard phase component and has an effect of improving the strength and toughness of the tool base.
  • the content is less than 4% by mass, a desired effect cannot be obtained in the above-described operation,
  • the wear resistance decreases, so the total content of iron group metals (for example, Co, Ni, Fe) as a binder phase component is 4 to 17% by mass. %.
  • the total content of iron group metals (eg, Co, Ni, Fe) as the binder phase component is 8% by mass to 13% by mass, but is not particularly limited thereto.
  • WC which is the main hard phase component, is a component that ensures the hardness of the tool base.
  • the W content in the WC-based cemented carbide is less than 75% by mass, the desired hardness cannot be exhibited, and Since the wear property is lowered, the W content in the WC-based cemented carbide is set to 75% by mass or more.
  • Each component of Ti, Zr, Nb, Ta and Cr forms carbides, nitrides, carbonitrides, etc., and has the effect of increasing the hardness of the WC-based cemented carbide and improving the wear resistance.
  • the toughness will decrease, so the content of each component of Ti, Zr, Nb, Ta and Cr
  • the total amount is preferably 10% by mass or less.
  • the total content of each component of Ti, Zr, Nb, Ta and Cr is 1% by mass to 5% by mass, but is not particularly limited thereto.
  • the TiCN-based cermet layer 2 serves as a tool base
  • the WC-based cemented carbide layer 3 serves as a rake face including a cutting edge.
  • the present invention has an angle formed by the rake face 4 and the flank face 5 of the tool of 90 degrees, and belongs to a so-called cutting tool called a negative insert.
  • the thickness of the WC-based cemented carbide layer 3 as the rake face 4 including the cutting edge is 0.1 to 0.3 times the thickness of the composite sintered body.
  • the “thickness of the WC-based cemented carbide layer 3 as the rake face 4” means that when the rake face 4 is formed on both the front and back surfaces of the TiCN-based cermet layer 2, the surface and The total thickness of the WC-based cemented carbide layer 3 on the back surface.
  • the thickness of the WC-based cemented carbide layer 3 is less than 0.1 times the thickness of the composite sintered body, a large load is applied to the TiCN-based cermet layer having poor toughness during cutting.
  • the thickness of the WC-based cemented carbide layer 3 exceeds 0.3 times the thickness of the composite sintered body, it is imparted to the WC-based cemented carbide layer 3. This is because the residual compressive stress is reduced, chipping resistance and chipping resistance are lowered, and the purpose of the present invention of reducing the amount of W used is not met. Therefore, in the present invention, the thickness of the WC-based cemented carbide layer 3 is 0.1 to 0.3 times the thickness of the composite sintered body.
  • the component composition of the TiCN-based cermet layer 2 in the cutting tool 1 of the present invention, the component composition of the WC-based cemented carbide layer 3, and the thickness of the WC-based cemented carbide layer 3 constituting the rake face 4 are as described above.
  • the maximum height difference 10 of the height profile from the reference line 9 is set to the tool thickness when the flank height profile is measured. It is necessary to keep it below 1%. As shown in FIG.
  • the rake passes through the center of the rake face 4 of the cutting tool 1 of the present invention and passes through the ridge line intersecting the rake face 4 and the flank 5 in a plane perpendicular to both the rake face 4 and the flank face 5.
  • the maximum height difference value of the height profile is the rake face 4 of the composite sintered body 1.
  • the ratio with respect to the thickness from the front surface to the back surface must be 0.01 or less.
  • the ratio of the maximum height difference exceeds 0.01, the residual stress of the rake face 4 of the cutting tool becomes a large value, so that the heat crack resistance is improved, but on the other hand, the wear resistance of the flank face is deteriorated. In addition, the finished surface accuracy of the work material also decreases.
  • Such a change in the height profile of the flank is caused by, for example, WC-based cemented carbide in a temperature range of about 1400 to 1440 ° C. when TiCN-based cermet and WC-based cemented carbide are laminated and sintered.
  • the shrinkage starts with the densification of the TiCN-based cermet, but the TiCN-based cermet at the interface between the WC-based cemented carbide layer 3 and the TiCN-based cermet layer 2 has been densified and is less likely to deform or shrink. Nevertheless, in the central part of the TiCN-based cermet layer 2, the deformation / shrinkage is not significantly hindered, so that the shrinkage further proceeds. As a result, as shown in FIG. 3, the WC-based cemented carbide and the TiCN-based cermet Due to the difference in shrinkage behavior, a large dent is formed in the central portion of the TiCN-based cermet layer 2.
  • the cutting tool 1 of the present invention can be used as a cutting tool as it is by using a composite sintered WC-based cemented carbide as the rake face 4 including the cutting edge, but at least the rake face 4 including the cutting edge.
  • a composite sintered WC-based cemented carbide as the rake face 4 including the cutting edge, but at least the rake face 4 including the cutting edge.
  • a composite nitride layer of Ti and Al as the hard coating layer 8 on the surface of the WC-based cemented carbide layer 3 constituting the hard coating layer 8 by physical vapor deposition, chemical vapor deposition, or the like, cutting performance can be further improved. Can be increased.
  • the hard coating layer 8 includes not only a Ti and Al composite nitride layer, but also a Ti nitride layer, a carbide layer, a carbonitride layer, an Al and Cr composite nitride layer, an Al 2 O 3 layer, and the like.
  • Various known hard coating layers can be formed as a single layer or as a laminate of a plurality of layers.
  • Example 1 a tool in which a rake face made of a WC-base cemented carbide having a polygonal planar shape is formed on only one surface of a TiCN-based cermet will be described.
  • a WC-based cemented carbide raw material powder having an average particle size of 0.5 to 3 ⁇ m having a composition shown in Table 1 is prepared.
  • the above WC-based cemented carbide raw material powder and TiCN-based cermet raw material powder were laminated and pressed with a mold for ISO insert shape SNMN120408 in the combinations shown in Table 3 to produce composite molded bodies 1-6.
  • the composite molded bodies 1 to 6 were sintered to produce composite sintered bodies 1 to 6.
  • the sintering conditions are as follows in each case.
  • the temperature is raised from room temperature to 1280 ° C. at a rate of 5 ° C./min, and the temperature range from 1280 ° C. to 1380 ° C. at which the liquid phase appears is Also, the temperature is increased at a high rate of 30 ° C./min or higher, the temperature is increased from 1380 ° C. to a predetermined 1420 ° C. at a rate of 5 ° C./min, and in a nitrogen atmosphere of 0.1 kPa, 1420 ° C.
  • composite sintered body cutting tools 1 to 6 (hereinafter referred to as the present invention tools 1 to 6) were prepared.
  • the cross section parallel to the stacking direction of the WC-based cemented carbide layer and the TiCN-based cermet layer of the above-described tools 1 to 6 of the present invention is measured from the interface between the WC-based cemented carbide layer and the TiCN-based cermet layer using an electron beam microanalyzer.
  • the WC-based cemented carbide layer and the TiCN are obtained by performing composition analysis at a position of 100 ⁇ m on the WC-based cemented carbide layer side and at a position of 100 ⁇ m on the TiCN-based cermet layer side to obtain an average value of 10-point measurements.
  • the component composition of the base cermet layer was determined. Table 4 shows these values.
  • the thicknesses of the WC-based cemented carbide layer and the TiCN-based cermet layer of the inventive tools 1 to 6 were measured by observing with an optical microscope. The thickness was measured at five different points, and this was averaged to obtain the thickness. Table 4 shows these values.
  • the surface of the WC-based cemented carbide alloy is subjected to arc ion plating to form a composite nitride of Ti and Al (note that the contents of Ti and Al are 50 atom% each).
  • a hard coating layer was formed by vapor deposition.
  • Table 4 shows the thickness of the hard coating layer formed by vapor deposition.
  • the WC-based cemented carbide raw material powder having the composition shown in Table 1 and the TiCN-based cermet raw material powder having the composition shown in Table 2 were laminated and pressed in the combinations shown in Table 5, and Comparative Composite Composites 1 to 6 was manufactured, and this composite molded body was sintered under the same conditions as in the examples to produce comparative composite sintered bodies 1-6.
  • comparative sintered bodies 7 to 9 made of only a WC-based cemented carbide alloy only from a WC-based cemented carbide raw material powder having the composition shown in Table 1 without using a TiCN-based cermet raw material powder (for convenience, comparative examples) Composite sintered bodies 7 to 9) were prepared.
  • the comparative tools 1 to 6 were measured from the interface between the WC-based cemented carbide layer and the TiCN-based cermet layer using an electron beam microanalyzer. Composition analysis is performed at a position of 100 ⁇ m on the hard alloy layer side and at a position of 100 ⁇ m on the TiCN-based cermet layer side, and an average value of 10-point measurement is obtained, thereby obtaining a WC-based cemented carbide layer and a TiCN-based cermet layer. The component composition was determined. Further, for Comparative Tools 1 to 6, the thicknesses of the WC-based cemented carbide layer and the TiCN-based cermet layer were measured with an optical microscope. The thickness was measured at five different points and averaged to obtain the thickness. Table 6 shows these values.
  • the measurement of the height profile of the flank with respect to the line perpendicular to the rake face and the measurement of the maximum height difference from the reference line of the profile are performed as follows, and the maximum with respect to the tool thickness is measured. The ratio of the height difference was obtained.
  • a stylus type surface shape measuring device one of the flank surfaces is set as the lower surface in the device, and the probe is set so as to pass through the center of the rake face and in a plane perpendicular to the rake face.
  • the tip of the probe is aligned with the ridge line where the rake face and flank face intersect, and the ridge line is scanned to the other ridge line to obtain a height profile.
  • the line connecting the two points of the ridgeline is the zero reference line, the maximum and minimum points from the reference line, the maximum height difference from the difference in height between the two points Ask for.
  • the thickness of the composite sintered body cutting tool was measured using a caliper, and the ratio of the maximum height difference to the tool thickness was determined by dividing the maximum height difference.
  • the surface of the WC-based cemented carbide alloy was subjected to arc ion plating to form a composite nitride of Ti and Al (note that the contents of Ti and Al are 50 atom% each).
  • a hard coating layer was formed by vapor deposition.
  • Table 6 shows the layer thickness of the hard coating layer formed by vapor deposition.
  • the coated tool of the present invention optimizes the component composition range of the TiCN-based cermet and the WC-based cemented carbide and reduces the cutting edge even if the amount of tungsten used is reduced.
  • the thickness ratio of the WC-based cemented carbide layer that comprises the rake face By optimizing the thickness ratio of the WC-based cemented carbide layer that comprises the rake face, intermittent and impactful high loads act on the cutting edges without reducing chipping resistance, and thermal loads Produces only WC-based cemented carbide with excellent abnormal damage resistance and wear resistance over a long period of use in wet interrupted cutting of alloy steel that also works.
  • the cutting performance is not inferior to that of the comparative tools 7 to 9 (that is, a tool with a used W amount reduction rate of 0%).
  • the tools 1 to 6 of the present invention have superior abnormal damage resistance compared to the comparative tools 7 to 9.
  • the comparative tools 1 to 6 have a reduced amount of tungsten used, they have poor thermal crack resistance, and it is clear that they reach the service life in a short time.
  • Example 1 although the planar shape of the rake face was a polygonal shape and a tool in which a rake face made of a WC-based cemented carbide was formed only on one surface of the TiCN-based cermet was described as Example 2, A tool in which a rake face is formed on both sides of a TiCN-based cermet will be described.
  • a WC-based cemented carbide raw material powder having an average particle size of 0.5 to 3 ⁇ m with a blending composition shown in Table 1 and TiCN having an average particle size of 0.5 to 3 ⁇ m with a blending composition shown in Table 2 Prepare base cermet raw material powder.
  • the TiCN-based cermet raw material powder is sandwiched with WC-based cemented carbide raw material powder from the upper and lower surfaces, and the combinations shown in Table 8 are laminated and pressed with a material mold of ISO insert shape SNMN120408 to form composite molded bodies 11-13. Produced.
  • the surface of the WC-based cemented carbide alloy is hardened by a composite nitride of Ti and Al (the contents of Ti and Al are 50 atom% each) by arc ion plating. A coating layer was deposited.
  • a wet interrupted cutting test of the alloy steel is performed under the same conditions as in Example 1, the amount of flank wear is measured, and a wet interrupted cutting test of the carbon steel is performed. And checked for the presence or absence of abnormal damage.
  • each tool is used without being laminated with cermet, and the entire WC-based cemented carbide is used. W amount reduction rate (mass%) was calculated. Table 10 shows these results.
  • Example 3 a tool whose rake face has a circular planar shape will be described.
  • a WC-based cemented carbide raw material powder having an average particle size of 0.5 to 3 ⁇ m having a blended composition shown in Table 1 and a TiCN-based cermet raw material powder having an average particle size of 0.5 to 3 ⁇ m having a blended composition shown in Table 2 are prepared.
  • the WC-based cemented carbide raw material powder and the TiCN-based cermet raw material powder were laminated and pressed with the mold for ISO insert shape RNMG120400 in the combinations shown in Table 11 to produce composite molded bodies 21 to 24.
  • the produced composite molded bodies 23 and 24 are sandwiched with the WC-based cemented carbide raw material powder from the upper and lower surfaces of the TiCN-based cermet raw material powder.
  • the composite molded bodies 21 to 24 were sintered to produce composite sintered bodies 21 to 24.
  • the sintering conditions are the same as in Example 1.
  • Cutting tools 21 to 24 (hereinafter referred to as inventive tools 21 to 24) were produced.
  • the surface of the WC-based cemented carbide alloy is subjected to arc ion plating to form a composite nitride of Ti and Al (note that the contents of Ti and Al are 50 atom% each).
  • a hard coating layer was formed by vapor deposition.
  • a wet interrupted cutting test of alloy steel is performed to measure the flank wear amount and a wet interrupted cutting test of carbon steel. And checked for the presence or absence of abnormal damage.
  • each tool is used without being laminated with cermet, and the entire WC-based cemented carbide is used. W amount reduction rate (mass%) was calculated. Table 13 shows these results.
  • the inventive tools 11 to 13 and 21 to 24 are subjected to intermittent and shocking high loads on the cutting edges, It can be seen that in wet interrupted cutting of alloy steel or the like that also exerts a mechanical load, excellent abnormal damage resistance and wear resistance are exhibited over a long period of use, and the amount of W used can be reduced. Similarly to the case of Example 1, from the viewpoint of abnormal damage resistance, the inventive tools 11 to 13 and 21 to 24 have superior abnormal damage resistance compared to the comparative tools 7 to 9. have.
  • the cutting tool of the present invention using a composite sintered body as a tool base can reduce the amount of tungsten, which is a rare metal, and is a wet intermittent operation in which an intermittent / impact high load and thermal load act on the cutting edge. Even when used for cutting, it has excellent thermal cracking resistance, and can exhibit excellent cutting performance over a long period of use without causing abnormal damage such as chipping, chipping, peeling, etc. It can cope with cost reduction sufficiently.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Powder Metallurgy (AREA)

Abstract

La présente invention concerne un outil de coupe compact fritté composite (1) obtenu à partir d'un compact fritté composite d'une couche de cermet à base de TiCN (2) et une couche métallique dure à base de WC (3), dans lequel : la couche de cermet à base de TiCN contient, en % en masse, 4 à 25 % en poids de composants métalliques du groupe du fer, moins de 15 % de W, 2 à 15 % de Mo, 2 à 10 % de Nb et 0,2 à 2 % de Cr et le rapport de teneur en Co par rapport à la teneur totale des composants métalliques du groupe du fer Co et Ni est un rapport de masse de 0,5 à 0,8 ; la couche métallique dure à base de WC contient, en % en masse, 4 à 17 % des composants métalliques du groupe du fer et au moins 75 % de W et comporte WC en tant que composant principal de phase dure ; l'angle formé par la face de coupe (4) et le flanc (5) est de 90 degrés ; la face de coupe comprenant le bord de coupe est configuré à partir de la couche métallique dure à base de WC ; l'épaisseur de la couche métallique dure à base de WC est de 0,05 à 0,3 fois l'épaisseur du compact fritté composite ; et le changement de hauteur de l'extrémité supérieure à l'extrémité inférieure du flanc dans une section transversale qui traverse le centre de la face de coupe de l'outil de coupe est tel que la différence de hauteur maximale (10) n'est pas supérieure à 0,01 par rapport à l'épaisseur du compact fritté composite.
PCT/JP2015/086053 2014-12-25 2015-12-24 Outil de coupe compact fritté composite et outil de coupe compact fritté composite avec surface revêtue WO2016104620A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15873188.5A EP3238866B1 (fr) 2014-12-25 2015-12-24 Outil de coupe compact fritté composite et outil de coupe compact fritté composite avec surface revêtue
CN201580070215.3A CN107107204B (zh) 2014-12-25 2015-12-24 复合烧结体切削工具及表面包覆复合烧结体切削工具
US15/538,562 US10569338B2 (en) 2014-12-25 2015-12-24 Composite sintered body cutting tool and surface coated composite sintered body cutting tool

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JP2014263582 2014-12-25
JP2014-263582 2014-12-25
JP2015250733A JP6614491B2 (ja) 2014-12-25 2015-12-23 複合焼結体切削工具および表面被覆複合焼結体切削工具
JP2015-250733 2015-12-23

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005521790A (ja) * 2002-03-28 2005-07-21 ヴィディア ゲゼルシャフト ミット ベシュレンクテル ハフツング 超硬合金切削材料又はサーメット切削材料並びにその使用法
JP5413047B2 (ja) * 2009-08-17 2014-02-12 住友電気工業株式会社 複合焼結体
JP2014172157A (ja) * 2013-03-12 2014-09-22 Mitsubishi Materials Corp 表面被覆切削工具

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005521790A (ja) * 2002-03-28 2005-07-21 ヴィディア ゲゼルシャフト ミット ベシュレンクテル ハフツング 超硬合金切削材料又はサーメット切削材料並びにその使用法
JP5413047B2 (ja) * 2009-08-17 2014-02-12 住友電気工業株式会社 複合焼結体
JP2014172157A (ja) * 2013-03-12 2014-09-22 Mitsubishi Materials Corp 表面被覆切削工具

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