JP5239060B2 - CBN sintered compact tool that suppresses damage at the edge boundary - Google Patents
CBN sintered compact tool that suppresses damage at the edge boundary Download PDFInfo
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- 238000005520 cutting process Methods 0.000 claims description 98
- 239000000463 material Substances 0.000 claims description 28
- 239000013078 crystal Substances 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 24
- 150000004767 nitrides Chemical class 0.000 claims description 14
- 239000011230 binding agent Substances 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 150000001247 metal acetylides Chemical class 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 description 6
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910000816 inconels 718 Inorganic materials 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- -1 Co Inorganic materials 0.000 description 1
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910010038 TiAl Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 229910001247 waspaloy Inorganic materials 0.000 description 1
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Description
本発明は、立方晶窒化硼素（cＢＮ）を主成分とした焼結体を基材とする刃先横境界部の損傷を抑制するcＢＮ焼結体工具に関する。 The present invention relates to a cBN sintered body tool that suppresses damage to the lateral boundary portion of the cutting edge using a sintered body mainly composed of cubic boron nitride (cBN) as a base material.
cＢＮ焼結体工具による難削材の加工では刃先の横境界部が損傷し、工具寿命に至る場合がある。例えばインコネル７１８やワスパロイ等の耐熱合金の切削加工では、cＢＮ含有率が高く、Ｗ，Ｃoの硼化物を結合相の主体としたcＢＮ焼結体工具が用いられるが、このとき、刃先の横境界部が溝状の摩耗が発達する等、選択的に損傷し、工具寿命に至る。また、鋳鉄の黒皮粗加工では鋳鉄の表面がチル化されているため、刃先の横境界部に摩耗が発達し、工具寿命に至る。 When machining difficult-to-cut materials with a cBN sintered body tool, the lateral boundary portion of the cutting edge may be damaged, leading to a tool life. For example, in cutting of heat-resistant alloys such as Inconel 718 and Waspaloy, a cBN sintered body tool having a high cBN content and mainly containing W and Co borides as a binder phase is used. The part is selectively damaged, such as the development of groove-shaped wear, leading to the tool life. Moreover, since the surface of the cast iron is chilled in the black-cut roughing of cast iron, wear develops at the lateral boundary portion of the cutting edge, leading to the tool life.
本発明は、鋳鉄の黒皮粗加工や、耐熱合金等の難削材料の切削加工時において、横切れ刃境界部を含む横切れ刃部分の損傷を低減し、長寿命のcＢＮ焼結体工具を低コストで提供することを課題とする。 The present invention reduces the damage of the side cutting edge part including the boundary part of the horizontal cutting edge during the rough machining of cast iron and the cutting of difficult-to-cut materials such as heat-resistant alloys, and reduces the long-lived cBN sintered body tool. It is an issue to provide at a cost.
本発明者等は上記課題を解決すべく鋭意検討を重ねた結果、横切れ刃境界部を含む横切れ刃部分をcＢＮ単結晶体により構成することが有効であることを見出し、本発明を完成させた。
本発明は以下の特徴を有する。
（１）本発明に係る切削加工用cＢＮ焼結体工具は、cＢＮ粒子を含有する焼結体を切れ刃部分とする刃先横境界部の損傷を抑制するcＢＮ焼結体工具であって、該焼結体のcＢＮ含有率が２０−９９体積％であり、被削材と接触する切れ刃部分において、切込みが最大となる点から、送り方向の切れ刃が、切り込み量のｘ％（６０≦ｘ≦９９）からｙ％（１０１≦ｙ）までがcＢＮ単結晶体で形成され、被削材と接触する他の切れ刃部分がcＢＮ多結晶体で形成されていることを特徴とする。
（２）上記（１）に記載のcＢＮ焼結体工具であって、前記焼結体の結合相が、周期律表４ａ、５ａ、６ａ族元素の窒化物、炭化物、硼化物、酸化物、及びこれらの固容体からなる群から選択される少なくとも一種と、Ａlの窒化物、硼化物、酸化物、及びこれらの固容体からなる群から選択される少なくとも一種とを含む、もしくは、Ｗ、Ｃo、Ｚr、Ｎi、Ｃr、Ａlのうち少なくとも１種以上の窒化物、炭化物、炭窒化物、硼化物、酸化物からなる、もしくはＡlの窒化物、硼化物、酸化物のうち少なくとも１種以上からなる、ことを特徴とする。
As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that it is effective to configure the side cutting edge portion including the side cutting edge boundary portion with a cBN single crystal, and completed the present invention. .
The present invention has the following features.
(1) A cBN sintered body tool for cutting according to the present invention is a cBN sintered body tool that suppresses damage to a lateral boundary portion of a cutting edge using a sintered body containing cBN particles as a cutting edge portion, Since the cBN content of the sintered body is 20-99% by volume and the cutting edge is in contact with the work material, the cutting edge in the feed direction is x% (60 ≦ From x ≦ 99) to y% (101 ≦ y) is formed of a cBN single crystal, and the other cutting edge portion in contact with the work material is formed of a cBN polycrystal.
(2) The cBN sintered body tool according to (1), wherein the binder has a binder phase of nitrides, carbides, borides, oxides of periodic table 4a, 5a, and 6a elements, And at least one selected from the group consisting of these solid solutions and at least one selected from the group consisting of Al nitrides, borides, oxides, and these solids, or W, Co , Zr, Ni, Cr, Al, comprising at least one nitride, carbide, carbonitride, boride, oxide, or at least one of Al nitride, boride, oxide It is characterized by.
（３）上記（１）又は（２）に記載のcＢＮ焼結体工具であって、被削材と接触する切れ刃のうち、切込みが最大となる点から、送り方向の切れ刃が、切り込み量のｘ％（６０≦ｘ≦９９）からｙ％（１０１≦ｙ）までがcＢＮ単結晶体で形成され、このcＢＮ単結晶体の粒子径が５０μｍ以上であることを特徴とする。
（４）上記（１）又は（２）に記載のcＢＮ焼結体工具であって、被削材と接触する切れ刃のうち、切込みが最大となる点から、送り方向の切れ刃が、切り込み量のｘ％（６０≦ｘ≦９９）からｙ％（１０１≦ｙ）までがcＢＮ単結晶体で形成され、このcＢＮ単結晶体の粒子径が１００μｍ以上であることを特徴とする。
(3) The cBN sintered body tool according to the above (1) or (2), wherein the cutting edge in the feed direction is the cutting edge from the point where the cutting becomes maximum among the cutting edges in contact with the work material. X% (60 ≦ x ≦ 99) to y% (101 ≦ y) of the amount is formed of a cBN single crystal, and the particle size of the cBN single crystal is 50 μm or more.
(4) The cBN sintered body tool according to (1) or (2) above, wherein the cutting edge in the feed direction is the cutting edge from the point of maximum cutting among the cutting edges that come into contact with the work material. X% (60 ≦ x ≦ 99) to y% (101 ≦ y) of the amount is formed of a cBN single crystal, and the particle size of the cBN single crystal is 100 μm or more.
耐熱合金の切削では切りくず厚みが厚い横境界部で切りくずが加工硬化により高硬度となり、この切りくずが接触する横境界部で損傷が発達する。鋳鉄の黒皮粗加工では、鋳鉄の表面が鋳造時に急冷されチル化して高硬度となっており、チル化された組織と切削する横境界部で損傷が発達する。これら横境界部が損傷する原因は、結合相粒子自体もしくはcＢＮ粒子と結合相の粒界、もしくは、cＢＮ粒子同士の粒界が、切削中に横境界部にかかる負荷により損傷し、cＢＮ粒子の脱落が進展するためである。したがって、本発明のcＢＮ焼結体工具は負荷がかかる横切れ刃境界部が強度に優れた単一のcＢＮ粒子から構成されているため、上記の横切れ刃の損傷が抑制され、工具寿命の大幅な改善を可能とする。 In the cutting of a heat-resistant alloy, the chips become hard due to work hardening at the lateral boundary portion where the chip thickness is thick, and damage develops at the lateral boundary portion where the chip contacts. In the rough black machining of cast iron, the surface of the cast iron is rapidly cooled at the time of casting and chilled to have high hardness, and damage develops at the chilled structure and the lateral boundary portion to be cut. The cause of damage to these lateral boundaries is that the bonded phase particles themselves or the grain boundaries between the cBN particles and the bonded phase, or the grain boundaries between the cBN particles are damaged by the load applied to the lateral boundaries during cutting. This is because the dropout progresses. Therefore, since the cBN sintered body tool of the present invention is composed of a single cBN particle having excellent strength at the side cutting edge boundary to which a load is applied, the damage of the side cutting edge is suppressed, and the tool life is greatly increased. Enable improvement.
図１に示すように、本発明に係る切削加工用cＢＮ焼結体工具は、cＢＮ粒子を含有する焼結体を切れ刃部分とする刃先横境界部の損傷を抑制するcＢＮ焼結体工具であって、該焼結体のcＢＮ含有率が２０−９９体積％であり、被削材と接触する切れ刃部分において、送り方向の切れ刃が、切り込みが最大となる点から、切り込み量のｘ％（６０≦ｘ≦９９）からｙ％（１０１≦ｙ）までが、cＢＮ単結晶体で形成され、被削材と接触する他の切れ刃部分がcＢＮ多結晶体で形成されていることを特徴とする。換言すれば、横切れ刃境界部となる切れ刃部分がcＢＮ単結晶体であることを特徴とする。
cＢＮ単結晶体はダイヤモンドに次ぐ非常に優れた高度と強度を有する。このため、横境界部で発生する切りくずが加工効果により硬度が高くなり刃先を攻撃する耐熱合金の加工や、横境界部分で表面層がチル化され高硬度となっている鋳鉄の黒皮粗加工においても、横切れ刃境界部の損傷を抑制することが可能となる。
As shown in FIG. 1, the cBN sintered body tool for cutting according to the present invention is a cBN sintered body tool that suppresses damage at the cutting edge lateral boundary portion with a sintered body containing cBN particles as a cutting edge portion. The cBN content of the sintered body is 20-99% by volume, and the cutting edge in the feed direction has a maximum cutting depth x at the cutting edge portion in contact with the work material. % (60 ≦ x ≦ 99) to y% (101 ≦ y) are formed of cBN single crystal, and the other cutting edge portion that contacts the work material is formed of cBN polycrystal. Features. In other words, the cutting edge portion that becomes the side cutting edge boundary portion is a cBN single crystal.
The cBN single crystal has very high altitude and strength after diamond. For this reason, the chip generated at the lateral boundary becomes hard due to the processing effect, and the heat-resistant alloy that attacks the cutting edge is processed. Also in the processing, it is possible to suppress the damage at the boundary portion of the horizontal cutting edge.
上記の通り、本発明に係るcＢＮ焼結体工具は、横切れ刃境界部を含む横切れ刃部分が単一のcＢＮ粒子から構成されていることを特徴とする。かかるcＢＮ焼結体チップは、粗粒のcＢＮ粒子と微粒のcＢＮ粒子とを原材料として用いるcＢＮ焼結体から切り出して作製される。すなわち、前記、横切れ刃部分が単一のcＢＮ粒子から構成されるように、該焼結体中の粗粒のcＢＮ粒子部分を選択して横切れ刃となるように切り出せば良い。 As described above, the cBN sintered body tool according to the present invention is characterized in that the side cutting edge portion including the side cutting edge boundary portion is composed of a single cBN particle. Such a cBN sintered body chip is produced by cutting out from a cBN sintered body using coarse cBN particles and fine cBN particles as raw materials. That is, the coarse cBN particle portion in the sintered body may be selected and cut to form a horizontal cutting edge so that the horizontal cutting edge portion is composed of a single cBN particle.
このとき、被削材と接触する切れ刃のうち、送り方向の切れ刃が、切り込みが最大となる点から、切り込み量のｘ％（６０≦ｘ≦９９）からｙ％（１０１≦ｙ）までが、cＢＮ単結晶体となるように、横切れ刃部分を構成するように選択される焼結体中のcＢＮ粒子の粒径は、５０μｍ以上であることが好ましい。これにより、切削時に横切れ刃となる切れ刃の大部分を強度に優れたcＢＮ単結晶体により構成することができる。この観点から、横切れ刃を構成するcＢＮ粒子の粒径が１００μｍ以上であることがより好ましい。またｙの値が２００以下のときに、コストが特に低くなる。 At this time, among cutting edges that come into contact with the work material, the cutting edge in the feed direction is from the point at which the cutting becomes maximum, from x% (60 ≦ x ≦ 99) to y% (101 ≦ y) of the cutting amount. However, it is preferable that the particle size of the cBN particles in the sintered body selected so as to constitute the side cutting edge portion so as to be a cBN single crystal is 50 μm or more. Thereby, most of the cutting edge which becomes a horizontal cutting edge at the time of cutting can be comprised by the cBN single crystal body excellent in intensity | strength. From this viewpoint, it is more preferable that the particle size of the cBN particles constituting the side cutting edge is 100 μm or more. Further, when the value of y is 200 or less, the cost is particularly low.
cＢＮ単結晶体は鉄族金属に対して熱的な摩耗が進行しやすいため、強度が必要な横切れ刃以外の切れ刃部分は熱的な摩耗に対して優れるcＢＮ多結晶体とすることが好ましい。 Since the cBN single crystal body is likely to be thermally worn against the iron group metal, it is preferable that the cutting edge portion other than the side cutting edge that requires strength is a cBN polycrystalline body that is excellent against thermal wear. .
上記cＢＮ焼結体は、cＢＮ含有率が２０−９９体積％であることを特徴とする。cＢＮの含有率がこれらの範囲にあることにより、焼結体の強度と耐摩耗性を両立することが可能となる。
更に、焼結体の結合相が、周期律表４ａ、５ａ、６ａ族元素の窒化物、炭化物、硼化物、酸化物、及びこれらの固容体からなる群から選択される少なくとも一種と、Ａlの窒化物、硼化物、酸化物、及びこれらの固容体からなる群から選択される少なくとも一種とを含む、 もしくは、Ｗ、Ｃo、Ｚr、Ｎi、Ｃr、Ａlのうち少なくとも１種以上の窒化物、炭化物、炭窒化物、硼化物、酸化物からなる、 もしくはＡlの窒化物、硼化物、酸化物のうち少なくとも１種以上からなる、ことを特徴とする。
これらの結合材成分により、cＢＮ焼結体の耐摩耗性及び強度を向上させることができる。当然、これらの成分以外にも不可避的に不純物が含まれていても構わない。
The cBN sintered body has a cBN content of 20 to 99% by volume. When the content of cBN is within these ranges, it is possible to achieve both the strength and wear resistance of the sintered body.
Furthermore, the bonded phase of the sintered body is at least one selected from the group consisting of nitrides, carbides, borides, oxides, and solids of the periodic table 4a, 5a, and 6a group elements, and Al. Or at least one selected from the group consisting of nitrides, borides, oxides, and solid solutions thereof, or at least one nitride of W, Co, Zr, Ni, Cr, and Al, It is characterized by being composed of carbide, carbonitride, boride, oxide, or at least one of Al nitride, boride, oxide.
With these binder components, the wear resistance and strength of the cBN sintered body can be improved. Of course, impurities other than these components may inevitably be contained.
超硬合金製のポット及びボールを用いて、ＴiＮとＡlＮ、ＴiＡl3を混合してから熱処理を施し、その後粉砕して結合材粉末を得た。次に結合材粉末と平均粒径が１．２μｍと平均粒径が１８０μｍのcＢＮ粉末を混合し、熱処理を施し、Ｍo製容器に充填し、圧力５．４ＧＰa、温度１，３２０℃で２０分焼結し、cＢＮ体積含有率が７５％のcＢＮ焼結体を得た。 Using cemented carbide pot and ball, TiN and AlN, a heat treatment from a mixture of TiAl 3 subjected, to obtain a binder powder was then ground. Next, the binder powder and cBN powder having an average particle diameter of 1.2 μm and an average particle diameter of 180 μm are mixed, heat-treated, and filled in a Mo container, pressure 5.4 GPa, temperature 1,320 ° C. for 20 minutes. Sintering was performed to obtain a cBN sintered body having a cBN volume content of 75%.
この焼結体を切断し、基材として超硬合金製の台金にロー材を用いて接合した後、研磨加工を実施し、cＢＮ焼結体切削工具（ＣＮＧＡ１２０４１２）を作製した。このとき、工具の横切れ刃境界部に粗粒のcＢＮ単結晶体が配置され、被削材と接触する切れ刃部分において、切込みが最大となる点から、送り方向の切れ刃が、切り込み量のｘ％（６０≦ｘ≦９９）からｙ％（１０１≦ｙ）までがcＢＮ単結晶体で形成され、被削材と接触する他の切れ刃部分がcＢＮ多結晶体で形成され、ｘ、ｙが表１に記載された値となるように焼結体中の粗粒cＢＮ単結晶粒子の位置を確認した後、切断、接合、研磨を実施した。 This sintered body was cut and joined to a base metal made of cemented carbide using a brazing material as a base material, and then subjected to polishing to produce a cBN sintered body cutting tool (CNGA120212). At this time, the coarse cBN single crystal body is arranged at the boundary of the side cutting edge of the tool, and the cutting edge in the feed direction has a cutting amount of the cutting amount from the point where the cutting becomes the maximum at the cutting edge portion contacting the work material. From x% (60 ≦ x ≦ 99) to y% (101 ≦ y) is formed of a cBN single crystal, and the other cutting edge portion in contact with the work material is formed of a cBN polycrystal, and x, y After confirming the position of the coarse-grained cBN single crystal particles in the sintered body so that becomes the value described in Table 1, cutting, joining, and polishing were performed.
このcＢＮ焼結体切削工具を用いて、被削材として表面がチル化されたＦＣ３００を用い、切削速度５００ｍ／ｍｉｎ、切り込み１．５ｍｍ、送り量０．２５ｍｍ／ｒｅｖ、ｗｅｔの条件で、切削試験を行った。工具横切れ刃を形成する粗粒cＢＮ単結晶体が切削時に被削材に接触する切れ刃のうち、切込みが最大となる点から、送り方向の切れ刃が、切り込み量のｘ％（６０≦ｘ≦９９）からｙ％（１０１≦ｙ）までがcＢＮ単結晶体で形成され、被削材と接触する他の切れ刃部分がcＢＮ多結晶体で形成され、ｘ、ｙが表１に記載された値となるように設定し、切削試験を実施したところ、寿命判定基準を横境界部の損傷として、表１に記載の工具寿命が得られた。 Using this cBN sintered body cutting tool, cutting is performed under the conditions of a cutting speed of 500 m / min, a cutting depth of 1.5 mm, a feed amount of 0.25 mm / rev, and wet using FC300 having a chilled surface as a work material. A test was conducted. Of the cutting edges in which the coarse cBN single crystal forming the tool side cutting edge comes into contact with the work material during cutting, the cutting edge in the feed direction is set to x% (60 ≦ x) of the cutting amount from the point of maximum cutting. ≦ 99) to y% (101 ≦ y) are formed of cBN single crystal, and other cutting edge portions that are in contact with the work material are formed of cBN polycrystal, and x and y are listed in Table 1. When the cutting test was performed, the tool life shown in Table 1 was obtained with the life criterion set as the damage on the lateral boundary.
次に、超硬合金製のポット及びボールを用いて、４ａ、５ａ、６ａ族遷移金属元素やＡlの化合物等の結合材材料、もしくはＷ、Ｃo、Ｚr、Ｎi、Ｃr、Ａlのうち少なくとも１種以上の窒化物、炭化物、炭窒化物、硼化物、酸化物からなる結合材材料、もしくはＡlの窒化物、硼化物、酸化物のうち少なくとも１種以上からなる結合材材料、を混合してから熱処理を施し、その後粉砕して結合材粉末を得た。次に結合材粉末とcＢＮ粉末を混合し、熱処理を施し、Ｍo製容器に充填し、圧力５ＧＰa、温度１，４００℃で２０分焼結し、cＢＮ焼結体を得た。 Next, using a cemented carbide pot and ball, a binder material such as a 4a, 5a, 6a group transition metal element or an Al compound, or at least one of W, Co, Zr, Ni, Cr, and Al. A binder material composed of at least one kind of nitride, carbide, carbonitride, boride, oxide, or a binder material composed of at least one of Al nitride, boride, and oxide After that, heat treatment was performed, and then pulverized to obtain a binder powder. Next, the binder powder and the cBN powder were mixed, heat-treated, filled in a Mo container, and sintered at a pressure of 5 GPa and a temperature of 1,400 ° C. for 20 minutes to obtain a cBN sintered body.
この焼結体を切断し、基材として超硬合金製の台金にロー材を用いて接合した後、表２に記載のcＢＮ焼結体切削工具（ＣＮＧＡ１２０４１２）を作製した。このとき、実施例１１〜３０においては、工具の横切れ刃境界部に粗粒のcＢＮ単結晶体が配置されるように焼結体中の粗粒cＢＮ単結晶粒子の位置を確認した後、切断、接合、研磨を実施した。 This sintered body was cut and joined to a base metal made of cemented carbide using a brazing material as a base material, and then a cBN sintered body cutting tool (CNGA120204) shown in Table 2 was produced. At this time, in Examples 11 to 30, after confirming the position of the coarse cBN single crystal particles in the sintered body so that the coarse cBN single crystal is disposed at the boundary of the side cutting edge of the tool, cutting is performed. Bonding and polishing were performed.
このcＢＮ焼結体切削工具を用いて、被削材としてインコネル７１８（ＨＲＣ４０）を用い、表３に記載の条件で切削試験を実施したところ、寿命判定基準を工具横境界の欠損として、表３に記載の工具寿命が得られた。 When this cBN sintered body cutting tool was used and a cutting test was performed under the conditions shown in Table 3 using Inconel 718 (HRC40) as a work material, The tool life described in 1 was obtained.
また、このcＢＮ焼結体切削工具を用いて、被削材としてねずみ鋳鉄ＦＣ２５０を用い、表４に記載の条件で黒皮加工の切削試験を実施したところ、寿命判定基準を工具横境界の欠損として、表４に記載の工具寿命が得られた。 In addition, when this cBN sintered body cutting tool was used and a gray cast iron FC250 was used as a work material and a black skin cutting test was performed under the conditions shown in Table 4, the life criterion was determined as a defect in the tool lateral boundary. As a result, the tool life shown in Table 4 was obtained.
Claims (4)
該焼結体のcＢＮ含有率が２０−９９体積％であり、
被削材と接触する切れ刃部分において、切込みが最大となる点から、送り方向の切れ刃が
切り込み量のｘ％からｙ％までがcＢＮ単結晶体で形成され、
ｘが６０以上９９以下であり、
ｙが１０１以上であり、
被削材と接触する他の切れ刃部分がcＢＮ多結晶体で形成されている
ことを特徴とする刃先横境界部の損傷を抑制するcＢＮ焼結体工具。 A cBN sintered body tool that suppresses damage to the cutting edge lateral boundary with a sintered body containing cBN particles as a cutting edge part,
The cBN content of the sintered body is 20-99% by volume,
From the point where the cutting becomes maximum at the cutting edge part that comes into contact with the work material, the cutting edge in the feed direction is formed of cBN single crystal from x% to y% of the cutting amount,
x is 60 or more and 99 or less,
y is 101 or more,
The cBN sintered compact tool which suppresses the damage of the edge boundary side edge part characterized by the other cutting-edge part which contacts a work material being formed with cBN polycrystal.
周期律表４ａ、５ａ、６ａ族元素の窒化物、炭化物、硼化物、酸化物、及びこれらの固容体からなる群から選択される少なくとも一種と、Ａlの窒化物、硼化物、酸化物、及びこれらの固容体からなる群から選択される少なくとも一種とを含む、
もしくは、Ｗ、Ｃo、Ｚr、Ｎi、Ｃr、Ａlのうち少なくとも１種以上の窒化物、炭化物、炭窒化物、硼化物、酸化物からなる、
もしくはＡlの窒化物、硼化物、酸化物のうち少なくとも１種以上からなる、
ことを特徴とする、請求項１に記載の刃先横境界部の損傷を抑制するcＢＮ焼結体工具。 The binder phase of the sintered body is
At least one selected from the group consisting of nitrides, carbides, borides, oxides, and solids of group 4a, 5a, and 6a elements of the periodic table; and Al nitrides, borides, oxides, and Including at least one selected from the group consisting of these solids,
Or at least one of nitrides, carbides, carbonitrides, borides and oxides of W, Co, Zr, Ni, Cr and Al.
Or at least one of Al nitride, boride, and oxide,
The cBN sintered body tool according to claim 1, wherein damage to the cutting edge lateral boundary portion is suppressed.
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