JP2007084382A - Cubic boron nitride sintered compact, coated cubic boron nitride sintered compact, and cutting tool for quench-hardened steel comprising the same - Google Patents
Cubic boron nitride sintered compact, coated cubic boron nitride sintered compact, and cutting tool for quench-hardened steel comprising the same Download PDFInfo
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- 229910052582 BN Inorganic materials 0.000 title claims abstract description 123
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 238000005520 cutting process Methods 0.000 title claims abstract description 39
- 229910000760 Hardened steel Inorganic materials 0.000 title claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 25
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 229910052735 hafnium Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 6
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 6
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 150000004767 nitrides Chemical class 0.000 claims abstract description 5
- 239000006104 solid solution Substances 0.000 claims abstract description 5
- 150000001247 metal acetylides Chemical class 0.000 claims abstract description 3
- 150000002739 metals Chemical class 0.000 claims abstract description 3
- 239000011230 binding agent Substances 0.000 claims description 32
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 3
- 239000010419 fine particle Substances 0.000 abstract description 2
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 8
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052810 boron oxide Inorganic materials 0.000 description 2
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005121 nitriding Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Abstract
Description
本発明は立方晶窒化硼素焼結体および被覆立方晶窒化硼素焼結体に関し、その中でも特に焼入鋼用切削工具として好適な立方晶窒化硼素焼結体および被覆立方晶窒化硼素焼結体に関する。 The present invention relates to a cubic boron nitride sintered body and a coated cubic boron nitride sintered body, and more particularly to a cubic boron nitride sintered body and a coated cubic boron nitride sintered body that are particularly suitable as a cutting tool for hardened steel. .
鋼の焼入れを浸炭性雰囲気で行うと鋼の表面に浸炭層が形成される。自動車のシャフトなどの機械部品に焼入鋼を使用する場合、焼入れによって焼入鋼の表面にできた浸炭層を切削加工によって除去することが多い。こうした切削加工には、立方晶窒化硼素焼結体切削工具が多く用いられる。近年、切削加工の能率を上げるため、切り込みを大きくすることが求められ、被削材の形状によっては焼入れされていない部分を切削加工しなければならず、このような切削加工において刃先温度は非常に高くなる。刃先温度が高温になると立方晶窒化硼素が酸化されて脆い酸化硼素となり耐欠損性が低下する。切削時の刃先温度を低下させるためには立方晶窒化硼素焼結体の熱伝導を良くすると好ましく、そのためには、熱伝導度が高い立方晶窒化硼素に比べて熱伝導度が低い結合相の厚みを小さくするとよいと考えられる。 When the steel is quenched in a carburizing atmosphere, a carburized layer is formed on the surface of the steel. When hardened steel is used for machine parts such as automobile shafts, the carburized layer formed on the surface of the hardened steel by quenching is often removed by cutting. For such cutting, a cubic boron nitride sintered body cutting tool is often used. In recent years, in order to increase the efficiency of cutting, it has been required to increase the depth of cut, and depending on the shape of the work material, it has been necessary to cut a portion that has not been hardened. To be high. When the cutting edge temperature becomes high, cubic boron nitride is oxidized to brittle boron oxide, and the fracture resistance is lowered. In order to lower the cutting edge temperature at the time of cutting, it is preferable to improve the thermal conductivity of the cubic boron nitride sintered body. For this purpose, a binder phase having a low thermal conductivity compared to cubic boron nitride having a high thermal conductivity. It is considered that the thickness should be reduced.
立方晶窒化硼素焼結体の従来技術としては、ｃＢＮの含有率が体積％で４５−７０％で、ｃＢＮ粒子の平均粒度が０．０１以上２μｍ未満であり、結合相厚みの平均値が１．０μｍ以下で、その標準偏差が０．７以下であることを特徴とするｃＢＮ焼結体がある（例えば、特許文献１参照。）。また、ｃＢＮの含有率が体積％で４５−７０％で、ｃＢＮ粒子の平均粒度が２以上６μｍ以下であり、結合相厚みの平均値が１．５μｍ以下で、その標準偏差が０．９以下であることを特徴とするｃＢＮ焼結体がある（例えば、特許文献２参照。）。 As a conventional technique of a cubic boron nitride sintered body, the content of cBN is 45 to 70% by volume, the average particle size of cBN particles is 0.01 or more and less than 2 μm, and the average value of the binder phase thickness is 1 There is a cBN sintered body having a standard deviation of 0.0 μm or less and a standard deviation of 0.7 or less (see, for example, Patent Document 1). The content of cBN is 45-70% by volume, the average particle size of cBN particles is 2 to 6 μm, the average value of the binder phase thickness is 1.5 μm or less, and the standard deviation is 0.9 or less. There is a cBN sintered body characterized by being (for example, refer to Patent Document 2).
ｃＢＮの含有率が体積％で４５−７０％で、ｃＢＮ粒子の平均粒度が０．０１以上２μｍ未満であり、結合相厚みの平均値が１．０μｍ以下で、その標準偏差が０．７以下であることを特徴とするｃＢＮ焼結体は、立方晶窒化硼素が微粒であるため立方晶窒化硼素を保持している結合相の表面積が小さくなり立方晶窒化硼素の保持力が小さくなるという問題がある。特に高速切削領域において立方晶窒化硼素の保持が難しくなる。 The content of cBN is 45-70% by volume, the average particle size of cBN particles is 0.01 or more and less than 2 μm, the average value of the binder phase thickness is 1.0 μm or less, and its standard deviation is 0.7 or less. In the cBN sintered body characterized in that the cubic boron nitride is fine, the surface area of the binder phase holding the cubic boron nitride is reduced, and the holding power of the cubic boron nitride is reduced. There is. In particular, it becomes difficult to hold cubic boron nitride in a high-speed cutting region.
ｃＢＮの含有率が体積％で４５−７０％で、ｃＢＮ粒子の平均粒度が２以上６μｍ以下であり、結合相厚みの平均値が１．５μｍ以下で、その標準偏差が０．９以下であることを特徴とするｃＢＮ焼結体は、立方晶窒化硼素が粗粒であるために結合相厚みの平均値が大きくなる。そこで、本発明は、切削工具として用いた場合に、特に焼入鋼の切削加工など切削時に刃先温度が高くなる加工において、優れた性能を発揮する立方晶窒化硼素焼結体および被覆立方晶窒化硼素焼結体の提供を目的とする。 The content of cBN is 45-70% by volume, the average particle size of cBN particles is 2 or more and 6 μm or less, the average value of the binder phase thickness is 1.5 μm or less, and its standard deviation is 0.9 or less. In the cBN sintered body characterized by this, the average value of the binder phase thickness is large because cubic boron nitride is coarse. Therefore, the present invention provides a cubic boron nitride sintered body and a coated cubic nitriding that exhibit excellent performance when used as a cutting tool, particularly in machining where the cutting edge temperature is high during cutting, such as cutting of hardened steel. An object is to provide a boron sintered body.
立方晶窒化硼素焼結体は、熱伝導度が高い立方晶窒化硼素と、熱伝導度が低い結合相とからなる。本発明により、立方晶窒化硼素焼結体に含まれる立方晶窒化硼素を粗粒と微粒とし、それらの混合比を最適化することによって、優れた性能の立方晶窒化硼素焼結体を得ることができた。具体的には、適量の粗粒立方晶窒化硼素を含むことによって立方晶窒化硼素を保持している結合相の表面積を大きくして、立方晶窒化硼素の保持力を高めることができた。また、粗粒立方晶窒化硼素と微粒立方晶窒化硼素の混合比を最適化することで、粗粒立方晶窒化硼素と粗粒立方晶窒化硼素との間にできる厚い結合相の中に微粒立方晶窒化硼素が分散されて結合相の厚みが小さくなり、立方晶窒化硼素焼結体の熱伝導度を高くすることができた。さらには、粗粒立方晶窒化硼素と微粒立方晶窒化硼素の混合比を最適化することで立方晶窒化硼素が最密充填され、単一粒径の立方晶窒化硼素の場合よりも耐摩耗性および耐欠損性を向上させることができた。 The cubic boron nitride sintered body is composed of cubic boron nitride having a high thermal conductivity and a binder phase having a low thermal conductivity. According to the present invention, a cubic boron nitride sintered body having excellent performance can be obtained by making cubic boron nitride contained in the cubic boron nitride sintered body coarse and fine and optimizing the mixing ratio thereof. I was able to. Specifically, by including an appropriate amount of coarse cubic boron nitride, the surface area of the binder phase holding the cubic boron nitride was increased, and the retention of cubic boron nitride could be increased. In addition, by optimizing the mixing ratio of coarse cubic boron nitride and fine cubic boron nitride, the fine cubic cubic is contained in the thick binder phase formed between the coarse cubic boron nitride and the coarse cubic boron nitride. The crystalline boron nitride was dispersed, the thickness of the binder phase was reduced, and the thermal conductivity of the cubic boron nitride sintered body could be increased. Furthermore, by optimizing the mixing ratio of coarse cubic boron nitride and fine cubic boron nitride, the cubic boron nitride is closely packed and wear resistance is higher than that of single grain cubic boron nitride. And the fracture resistance could be improved.
すなわち、本発明は、立方晶窒化硼素：立方晶窒化硼素焼結体全体に対して５５〜７５体積％と、Ｔｉ、Ｚｒ、Ｈｆ、Ｖ、Ｎｂ、Ｔａ、Ｃｒ、Ｍｏ、Ｗ、Ｆｅ、Ｃｏ、Ｎｉ、Ａｌの金属、炭化物、窒化物、酸化物、硼化物およびこれらの相互固溶体の中から選ばれた少なくとも１種の結合相：残部とからなり、立方晶窒化硼素は、粒径が０．５〜２．０μｍの微粒立方晶窒化硼素：立方晶窒化硼素全体に対して３０〜７０体積％と、粒径が２．０μｍ超〜１０μｍの粗粒立方晶窒化硼素：立方晶窒化硼素全体に対して３０〜７０体積％とからなり、結合相厚みの平均値は０．５〜１．０μｍである立方晶窒化硼素焼結体である。 That is, the present invention relates to cubic boron nitride: 55 to 75% by volume based on the entire cubic boron nitride sintered body, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Fe, Co. , Ni, Al metal, carbide, nitride, oxide, boride and at least one binder phase selected from these solid solutions: the balance, cubic boron nitride has a particle size of 0 .5 to 2.0 μm fine cubic boron nitride: 30 to 70% by volume with respect to the entire cubic boron nitride, and coarse cubic boron nitride having a particle size of more than 2.0 μm to 10 μm: the entire cubic boron nitride The cubic boron nitride sintered body is 30 to 70% by volume with an average binder phase thickness of 0.5 to 1.0 μm.
本発明の立方晶窒化硼素焼結体は、立方晶窒化硼素：立方晶窒化硼素焼結体全体に対して５５〜７５体積％と、Ｔｉ、Ｚｒ、Ｈｆ、Ｖ、Ｎｂ、Ｔａ、Ｃｒ、Ｍｏ、Ｗ、Ｆｅ、Ｃｏ、Ｎｉ、Ａｌの金属、炭化物、窒化物、酸化物、硼化物およびこれらの相互固溶体の中から選ばれた少なくとも１種の結合相：残部とからなる。これは、立方晶窒化硼素が立方晶窒化硼素焼結体全体に対して５５体積％未満になると相対的に結合相が多くなり、結合相厚みの平均値が大きくなり切削性能が低下し、立方晶窒化硼素が立方晶窒化硼素焼結体全体に対して７５体積％を超えて多くなると相対的に結合相が少なくなり耐摩耗性が減少するので、５５〜７５体積％の範囲とした。 The cubic boron nitride sintered body of the present invention has a cubic boron nitride: 55 to 75% by volume with respect to the entire cubic boron nitride sintered body, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo. , W, Fe, Co, Ni, Al metals, carbides, nitrides, oxides, borides, and mutual solid solutions thereof, and at least one binder phase: the balance. This is because when the cubic boron nitride is less than 55% by volume with respect to the entire cubic boron nitride sintered body, the binder phase is relatively increased, the average value of the binder phase thickness is increased, and the cutting performance is lowered. When the amount of crystal boron nitride exceeds 75 volume% with respect to the entire cubic boron nitride sintered body, the binder phase is relatively reduced and the wear resistance is decreased.
本発明の立方晶窒化硼素焼結体の結合相は、Ｔｉ、Ｚｒ、Ｈｆ、Ｖ、Ｎｂ、Ｔａ、Ｃｒ、Ｍｏ、Ｗ、Ｆｅ、Ｃｏ、Ｎｉ、Ａｌの金属、炭化物、窒化物、酸化物、硼化物およびこれらの相互固溶体の中から選ばれた少なくとも１種からなる。具体的には、ＴｉＮ、ＴｉＢ2、ＡｌＮなどを挙げることができる。 The binder phase of the cubic boron nitride sintered body of the present invention is Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Fe, Co, Ni, Al metal, carbide, nitride, oxide. And at least one selected from borides and their mutual solid solutions. Specific examples include TiN, TiB 2 , and AlN.
立方晶窒化硼素焼結体に含まれる立方晶窒化硼素が微粒と粗粒とからなり最密充填されると、耐摩耗性および耐欠損性が向上する。本発明の立方晶窒化硼素焼結体の立方晶窒化硼素を、粒径が０．５〜２．０μｍの微粒立方晶窒化硼素：立方晶窒化硼素全体に対して３０〜７０体積％と、粒径が２．０μｍ超〜１０μｍの粗粒立方晶窒化硼素：立方晶窒化硼素全体に対して３０〜７０体積％とからなると、立方晶窒化硼素が最密充填され耐摩耗性および耐欠損性が向上する。なお、微粒立方晶窒化硼素と粗粒立方晶窒化硼素との合計は１００体積％になる。粒径が０．５〜２．０μｍの微粒立方晶窒化硼素は立方晶窒化硼素全体に対して３０体積％未満になると、相対的に粗粒立方晶窒化硼素が多くなるため、結合相厚さの平均値が１．０μｍを超えて増加し、粒径が０．５〜２．０μｍの微粒立方晶窒化硼素は立方晶窒化硼素全体に対して７０体積％を超えて多くなると、立方晶窒化硼素を保持している結合相の表面積が小さくなり立方晶窒化硼素の保持力が小さくなる。したがって、本発明の立方晶窒化硼素焼結体に含まれる立方晶窒化硼素は、微粒立方晶窒化硼素：３０〜７０体積％と、粗粒立方晶窒化硼素：３０〜７０体積％とからなると定めた。その中でも、立方晶窒化硼素は、微粒立方晶窒化硼素：４０〜６０体積％と、粗粒立方晶窒化硼素：４０〜６０体積％とからなるとさらに好ましく、その中でも立方晶窒化硼素は、微粒立方晶窒化硼素：４５〜５５体積％と、粗粒立方晶窒化硼素：４５〜５５体積％とからなるとさらに好ましい。 When the cubic boron nitride contained in the cubic boron nitride sintered body consists of fine particles and coarse particles and is closely packed, the wear resistance and fracture resistance are improved. The cubic boron nitride of the cubic boron nitride sintered body of the present invention is a fine cubic boron nitride having a particle size of 0.5 to 2.0 μm: 30 to 70% by volume with respect to the entire cubic boron nitride, Coarse-grained cubic boron nitride having a diameter of more than 2.0 μm to 10 μm: When it is 30 to 70% by volume with respect to the entire cubic boron nitride, the cubic boron nitride is closely packed and wear resistance and fracture resistance are obtained. improves. The total of fine cubic boron nitride and coarse cubic boron nitride is 100% by volume. When the cubic cubic boron nitride having a particle size of 0.5 to 2.0 μm is less than 30% by volume with respect to the entire cubic boron nitride, the amount of coarse cubic boron nitride is relatively increased. When the average value of Cb increases beyond 1.0 μm and the amount of fine cubic boron nitride having a particle size of 0.5 to 2.0 μm increases to more than 70% by volume with respect to the entire cubic boron nitride, cubic nitriding occurs. The surface area of the binder phase holding boron is reduced, and the holding power of cubic boron nitride is reduced. Therefore, the cubic boron nitride contained in the cubic boron nitride sintered body of the present invention is determined to be composed of fine cubic boron nitride: 30 to 70% by volume and coarse cubic boron nitride: 30 to 70% by volume. It was. Among them, the cubic boron nitride is more preferably composed of fine cubic boron nitride: 40 to 60% by volume and coarse cubic boron nitride: 40 to 60% by volume. Among them, the cubic boron nitride is fine cubic cubic. More preferably, it is composed of 45 to 55% by volume of crystalline boron nitride and 45 to 55% by volume of coarse cubic boron nitride.
本発明の立方晶窒化硼素焼結体の結合相厚みの平均値は０．５〜１．０μｍとした。立方晶窒化硼素焼結体が、立方晶窒化硼素：立方晶窒化硼素焼結体全体に対して５５〜７５体積％と、結合相：残部とで構成され、立方晶窒化硼素を粒径が０．５〜２．０μｍの微粒立方晶窒化硼素：３０〜７０体積％と、粒径が２．０μｍ超〜１０μｍの粗粒立方晶窒化硼素：３０〜７０体積％とからなると結合相厚みの平均値を１．０μｍ以下にすることができる。しかしながら粗粒立方晶窒化硼素の割合が増加するなどにより、立方晶窒化硼素焼結体の結合相厚みの平均値が１．０μｍを超えると、熱伝導度が低下し、切削時に刃先温度が高温になり立方晶窒化硼素が酸化されて脆い酸化硼素を形成するため、耐欠損性が低下する。また、立方晶窒化硼素焼結体の結合相厚みの平均値が０．５μm未満では結合相が立方晶窒化硼素を保持する力が低下し耐摩耗性が低下する。 The average value of the binder phase thickness of the cubic boron nitride sintered body of the present invention was 0.5 to 1.0 μm. The cubic boron nitride sintered body is composed of cubic boron nitride: 55 to 75% by volume with respect to the entire cubic boron nitride sintered body and a binder phase: the balance, and the cubic boron nitride has a particle size of 0. .5 to 2.0 μm fine cubic boron nitride: 30 to 70% by volume, and coarse cubic boron nitride having a particle size of more than 2.0 μm to 10 μm: 30 to 70% by volume, the average binder phase thickness The value can be 1.0 μm or less. However, if the average value of the binder phase thickness of the cubic boron nitride sintered body exceeds 1.0 μm due to an increase in the proportion of coarse-grained cubic boron nitride, the thermal conductivity decreases, and the cutting edge temperature is high during cutting. As the cubic boron nitride is oxidized to form brittle boron oxide, the fracture resistance is lowered. On the other hand, if the average value of the binder phase thickness of the cubic boron nitride sintered body is less than 0.5 μm, the force with which the binder phase holds the cubic boron nitride is lowered and the wear resistance is lowered.
本発明の立方晶窒化硼素焼結体の表面に被膜を被覆した被覆立方晶窒化硼素焼結体は、耐摩耗性、潤滑性、耐酸化性が向上するため好ましい。被膜は、Ｔｉ、Ｚｒ、Ｈｆ、Ｖ、Ｎｂ、Ｔａ、Ｃｒ、Ｍｏ、Ｗ、Ａｌ、Ｓｉの中の少なくとも１種の金属元素と窒素、炭素、酸素、硼素の中の少なくとも１種の非金属元素との化合物からなる。具体的には、ＴｉＮ、ＴｉＣ、ＴｉＮ、（Ｔｉ，Ａｌ）Ｎ、（Ｔｉ，Ｓｉ）Ｎ、（Ｔｉ，Ａｌ，Ｃｒ）Ｎ、（Ａｌ，Ｃｒ）Ｎ、（Ａｌ，Ｃｒ）ＮＯなどを挙げることができる。その中でも（Ａｌ，Ｃｒ）Ｎ、（Ａｌ，Ｃｒ）ＮＯがさらに好ましい。なお、被膜は従来からあるＰＶＤ法、ＣＶＤ法によって被覆することができる。 The coated cubic boron nitride sintered body obtained by coating the surface of the cubic boron nitride sintered body of the present invention is preferable because of improved wear resistance, lubricity and oxidation resistance. The coating is composed of at least one metal element in Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and at least one nonmetal in nitrogen, carbon, oxygen, boron. Consists of compounds with elements. Specifically, TiN, TiC, TiN, (Ti, Al) N, (Ti, Si) N, (Ti, Al, Cr) N, (Al, Cr) N, (Al, Cr) NO, etc. be able to. Among these, (Al, Cr) N and (Al, Cr) NO are more preferable. The coating can be applied by conventional PVD methods and CVD methods.
本発明の立方晶窒化硼素焼結体および被覆立方晶窒化硼素焼結体は、耐摩耗性、耐欠損性に優れるため、切削工具として用いられるのが好ましく、その中でも、切削時に刃先温度が高くなりやすい焼入鋼用切削工具として用いられるとさらに好ましい。 The cubic boron nitride sintered body and the coated cubic boron nitride sintered body of the present invention are preferably used as a cutting tool because of their excellent wear resistance and fracture resistance, and among them, the cutting edge temperature is high during cutting. More preferably, it is used as a hardened steel cutting tool.
本発明の立方晶窒化硼素焼結体および被覆立方晶窒化硼素焼結体は、耐摩耗性、耐欠損性に優れるため、切削工具として用いた場合に優れた性能を示し長寿命を達成する。その中でも特に焼入鋼の切削加工など、切削時に刃先温度が高くなる切削加工において優れた性能を発揮する。 Since the cubic boron nitride sintered body and the coated cubic boron nitride sintered body of the present invention are excellent in wear resistance and fracture resistance, they exhibit excellent performance when used as a cutting tool and achieve a long life. In particular, it exhibits excellent performance in cutting processing in which the cutting edge temperature becomes high during cutting, such as cutting of hardened steel.
粒径が０．５〜２．０μｍの微粒立方晶窒化硼素粉末、粒径が２．０μm超〜１０μｍの粗粒立方晶窒化硼素粉末、平均粒径２μｍのＴｉＮ粉末、平均粒径４μｍのＡｌ粉末を用意した。体積比でＴｉＮ：Ａｌ＝５：２となるように配合したものを結合相形成粉末とした。微粒立方晶窒化硼素粉末、粗粒立方晶窒化硼素粉末、結合相形成粉末を表１に示すように配合した。配合した原料粉末を湿式混合し、乾燥させた混合粉末を金属カプセルに充填した後、超高圧発生装置の容器内に挿入し、圧力６．５ＧＰａ、温度１６５０℃、保持時間３０分の焼結条件で焼結し、発明品１〜４および従来品１〜２を得た。ここで比較品１は特開２０００−４４３４７号公報の特許請求の範囲に含まれる。比較品２は特開２０００−４４３５０号公報の特許請求の範囲に含まれる。 Fine cubic boron nitride powder having a particle size of 0.5 to 2.0 μm, coarse cubic boron nitride powder having a particle size of more than 2.0 μm to 10 μm, TiN powder having an average particle size of 2 μm, Al having an average particle size of 4 μm Powder was prepared. What was mix | blended so that it might become TiN: Al = 5: 2 by volume ratio was made into the binder phase formation powder. As shown in Table 1, fine cubic boron nitride powder, coarse cubic boron nitride powder, and binder phase forming powder were blended. The mixed raw material powder is wet-mixed, and the dried mixed powder is filled into a metal capsule, and then inserted into a container of an ultra-high pressure generator, pressure 6.5 GPa, temperature 1650 ° C., sintering time 30 minutes sintering conditions Inventive products 1-4 and conventional products 1-2 were obtained. Here, the comparative product 1 is included in the scope of claims of Japanese Patent Laid-Open No. 2000-44347. The comparative product 2 is included in the scope of claims of Japanese Patent Laid-Open No. 2000-44350.
各試料は研磨して、立方晶窒化硼素の粒度分布、結合相厚さ、ヌープ硬さを測定した。得られた発明品と従来品の立方晶窒化硼素の粒度分布、結合相厚さの平均値、結合相厚さの標準偏差、ヌープ硬さを表２に示す。 Each sample was polished, and the particle size distribution, binder phase thickness, and Knoop hardness of cubic boron nitride were measured. Table 2 shows the particle size distribution, the average value of the binder phase thickness, the standard deviation of the binder phase thickness, and the Knoop hardness of the obtained inventive and conventional cubic boron nitride.
得られた焼結体は、組成が重量％で４５Ａｇ−３０Ｃｕ−２５Ｚｎの銀ロウを介して超硬合金基材に接合し、ＪＩＳ規格ＣＮＧＡ１２０４０８形状の切削チップに研磨加工して以下の切削試験を行った。切削試験結果を表３に示す。 The obtained sintered body was bonded to a cemented carbide substrate through a silver brazing alloy having a composition of 45% by weight of 30Ag-30Cu-25Zn. went. Table 3 shows the results of the cutting test.
［切削試験］
被削材：ギア材用焼入鋼ＳＣＭ４１５（表面から深さ０．６ｍｍ未満の焼入れされている部分はＨＲＣ６０〜６２を示す。表面から深さ０．６ｍｍ以上の内部は焼入れされていない。）
切削速度：Ｖｃ＝８０ｍ／ｍｉｎ
切り込み：ａｐ＝０．８ｍｍ
送り：ｆ＝０．１２ｍｍ／ｒｅｖ
切削油：なし（乾式）
寿命判定基準：切削チップに欠損を生じること
[Cutting test]
Work material: Hardened steel SCM415 for gear material (the portion hardened to a depth of less than 0.6 mm from the surface indicates HRC 60 to 62. The inside of the depth of 0.6 mm or more from the surface is not hardened)
Cutting speed: Vc = 80 m / min
Cutting depth: ap = 0.8mm
Feed: f = 0.12mm / rev
Cutting oil: None (dry type)
Life criterion: Defects in cutting tips
表３に示されるように、発明品１〜４は比較品１、２よりも長寿命となった。 As shown in Table 3, the inventive products 1 to 4 have a longer life than the comparative products 1 and 2.
実施例１で得られた発明品１〜４、比較品１、２の表面にＰＶＤ法によって平均膜厚２μｍの（Ａｌ，Ｃｒ）ＮＯ膜を被覆して発明品５〜８、比較品３、４の被覆立方晶窒化硼素焼結体を得た。得られた試料を用いて実施例１の切削試験と同じ条件で切削試験を行った。切削試験結果を表４に示す。 Inventive products 1 to 4 obtained in Example 1 and the surfaces of comparative products 1 and 2 are coated with an (Al, Cr) NO film having an average film thickness of 2 μm by the PVD method. 4 coated cubic boron nitride sintered bodies were obtained. Using the obtained sample, a cutting test was performed under the same conditions as the cutting test of Example 1. Table 4 shows the results of the cutting test.
表４に示されるように、発明品５〜８は比較品３、４よりも長寿命となった。
As shown in Table 4, the inventive products 5 to 8 had a longer life than the comparative products 3 and 4.
Claims (4)
A cutting tool for hardened steel, comprising the coated cubic boron nitride sintered body according to claim 2.
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