JP4229750B2 - Cubic boron nitride sintered body - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は立方晶窒化硼素含有量の多い立方晶窒化硼素焼結体に関する。その中でも主に切削加工に用いられる立方晶窒化硼素焼結体に関する。
【０００２】
【従来の技術】
一般的に立方晶窒化硼素焼結体切削工具は、立方晶窒化硼素焼結体ブランクスからワイヤーカット放電加工により刃先形状の立方晶窒化硼素焼結体を切り出し、超硬合金台金にロウ付けする。ワイヤーカット放電加工ができない場合、レーザーカット加工を行うが、研削取りしろ幅が増えることで製造コストが増加する。
【０００３】
立方晶窒化硼素焼結体に関する従来の技術として、立方晶窒化硼素を８０〜９５体積％の割合で含有し、残りが窒化硼素とアルミニウムと周期律表４ａ、５ａ、６ａ族金属の酸化物のうちの少なくとも１種との反応により生成される化合物を主体とする立方晶窒化硼素焼結体がある（例えば、特許文献１参照。）。しかしながら、立方晶窒化硼素含有量が８８体積％以上になると比抵抗が高くなり、ワイヤーカット放電加工が困難になるという問題があった。
【０００４】
また、立方晶窒化硼素を７０〜９５体積％の割合で含有し、残りがＣｏ、コバルト合金、およびＡｌと、Ｎｉ、Ｍｎ、Ｆｅ、ＶおよびＣｒから選ばれた合金形成性金属の金属相からなる立方晶窒化硼素焼結体がある（例えば、特許文献２参照。）。しかしながら、立方晶窒化硼素含有量が８８体積％以上になると、比抵抗が高くなり、ワイヤーカット放電加工が困難になるという問題があった。
【０００５】
【特許文献１】
特開平６−１６６６号公報
【特許文献２】
特開昭５３−１１４５８９号公報
【０００６】
【発明が解決しようとする課題】
本発明者らは、立方晶窒化硼素含有量の多い立方晶窒化硼素焼結体を切削工具に応用することを試みている。しかしながら、立方晶窒化硼素含有量の多い立方晶窒化硼素焼結体は、比抵抗が高いため、ワイヤーカット放電加工が困難であるという問題があった。そこで、本発明は、比抵抗が低く、立方晶窒化硼素含有量の多い立方晶窒化硼素焼結体の提供を目的とする。
【０００７】
【課題を解決するための手段】
本発明者らは、上記の課題を解決すべく立方晶窒化硼素焼結体に関する研究を重ねたところ、結合相としてＢ6Ｃｏ21Ｗ2を含む立方晶窒化硼素焼結体において、立方晶窒化硼素（１１１）面のＸ線回折強度に対するＢ6Ｃｏ21Ｗ2（４２０）面のＸ線回折強度の割合を示す強度比が、立方晶窒化硼素焼結体の比抵抗に影響を及ぼすという知見を得て本発明を完成した。
【０００８】
すなわち、本発明立方晶窒化硼素焼結体は、立方晶窒化硼素：８８〜９７体積％と、Ｗ、Ｃｏ、Ａｌの炭化物、窒化物、硼化物およびこれらの固溶体の中から選ばれた少なくとも１種からなる結合相と不可避不純物：残部とで構成された立方晶窒化硼素焼結体であって、該結合相はＢ6Ｃｏ21Ｗ2を含有するとともに、Ｂ6Ｃｏ21Ｗ2の（４２０）面のＸ線回折強度をＩｗ、立方晶窒化硼素の（１１１）面のＸ線回折強度をＩｂと表したとき、Ｉｂに対するＩｗの割合を示す強度比Ｉｗ／Ｉｂが０．１０〜０．４０となることを特徴とする。
【０００９】
本発明立方晶窒化硼素焼結体に含まれる立方晶窒化硼素量が８８体積％未満であると耐摩耗性が低下し、９７体積％を超えると相対的に結合相が減少し焼結性が低下する。そこで立方晶窒化硼素含有量を８８〜９７体積％とした。その中でも立方晶窒化硼素含有量は、９３〜９５体積％であると好ましい。
【００１０】
本発明立方晶窒化硼素焼結体の結合相は、Ｗ、Ｃｏ、Ａｌの炭化物、窒化物、硼化物およびこれらの固溶体の中から選ばれた少なくとも１種であり、立方晶窒化硼素との親和性が高く耐熱性も高い。具体的には、ＡｌＢ2、ＡｌＮ、ＢＣｏＷ、Ｂ2ＣｏＷ2、Ｂ3ＣｏＷ3、Ｂ6Ｃｏ21Ｗ2、Ｂ6ＣｏＷ3、Ｂ10ＣｏＷ9、ＷＣなどが挙げられる。その中でも、Ｂ6Ｃｏ21Ｗ2を主成分とすると特に好ましい。
【００１１】
本発明立方晶窒化硼素焼結体についてＣｕターゲットのKα線によりＸ線回折測定を行い、Ｂ6Ｃｏ21Ｗ2の（４２０）面のＸ線回折強度をＩｗ、立方晶窒化硼素の（１１１）面のＸ線回折強度をＩｂと表したとき、Ｉｂに対するＩｗの割合を示す強度比Ｉｗ／Ｉｂが０．１未満であると比抵抗が増加しワイヤーカット放電加工が難しくなる。Ｉｗ／Ｉｂが０．４を超えると立方晶窒化硼素焼結体の硬さが低下し、切削工具として用いた場合、耐摩耗性が低下する。したがって、Ｉｗ／Ｉｂを０．１〜０．４と定めた。なお、立方晶窒化硼素、Ｂ6Ｃｏ21Ｗ2のＸ線回折図形以外に、ＡｌＢ2、ＡｌＮ、ＢＣｏＷ、Ｂ2ＣｏＷ2、Ｂ3ＣｏＷ3、Ｂ6ＣｏＷ3、Ｂ10ＣｏＷ9、ＷＣのＸ線回折図形が観察される場合がある。
【００１２】
本発明立方晶窒化硼素焼結体の比抵抗が、５×１０-6Ω・ｃｍ未満を示すことはなく、１０Ω・ｃｍを超えるとワイヤーカット放電加工能率の低下が顕著になる。したがって、比抵抗は５×１０-6〜１０Ω・ｃｍであると好ましい。
【００１３】
試験荷重：４．９０Ｎ、荷重保持時間：１５秒の試験条件で測定した本発明立方晶窒化硼素焼結体のヌープ硬さは、３９００以上であると耐摩耗性が向上する。また、ヌープ硬さが４３００を超えることは困難であるため、ヌープ硬さは、３９００〜４３００の範囲であると好ましい。
【００１４】
本発明立方晶窒化硼素焼結体は、鋭角部の強度が高く耐欠損性に優れるため、切削工具として用いると好ましい。切削工具として用いた場合、加工材の面精度に優れる。本発明立方晶窒化硼素焼結体は、ワイヤーカット放電加工が可能であるため、レーザーカット加工しかできなかった従来の立方晶窒化硼素焼結体よりも複雑な工具形状にも加工できる。本発明立方晶窒化硼素焼結体を鉄系焼結金属、高硬度ハイスロールに代表されるＨＲＣ５０以上の非常に硬い難削材を加工する切削工具として用いることは特に好ましく、その中でも鉄系焼結金属用切削工具として用いると、さらに好ましい。
【００１５】
【実施例１】
市販の平均粒径２μｍの立方晶窒化硼素粉末、平均粒径２μｍのＷＣ粉末、平均粒径１．５μｍのＣｏ粉末、平均粒径４μｍのＡｌ粉末を用意する。体積比でＷＣ：Ｃｏ：Ａｌ=２：７：５となるように配合した粉末Ａと立方晶窒化硼素（ｃＢＮ）粉末を表１に示すように配合した。配合した原料粉末をウレタン内張りボールミルで湿式混合し、乾燥させた混合粉末を金属カプセルに充填した後、超高圧高温発生装置の容器内に挿入し、圧力６ＧＰａ、温度１６００℃、保持時間３０分の焼結条件で焼結した。焼結体として得られた本発明立方晶窒化硼素焼結体１〜３、比較立方晶窒化硼素焼結体１を研磨し、Ｘ線回折測定を行った。Ｂ6Ｃｏ21Ｗ2の（４２０）面のＸ線回折強度をＩｗ、立方晶窒化硼素の（１１１）面のＸ線回折強度をＩｂと表したとき、強度比Ｉｗ／Ｉｂを表２に示した。また、研磨面をエネルギー分散型Ｘ線分析器および波長分散型Ｘ線分析器付きの走査型電子顕微鏡で観察し、立方晶窒化硼素焼結体に含まれる立方晶窒化硼素（ｃＢＮ）量を測定した。さらに、試験荷重：４．９０Ｎ、荷重保持時間：１５秒の試験条件でヌープ硬さ（Ｈｋ）と比抵抗を測定した。それらの結果を表２に示した。本発明立方晶窒化硼素焼結体１〜３、比較立方晶窒化硼素焼結体１を１辺５ｍｍ、厚み１ｍｍの正三角形に切断し、チップ形状：ＴＮＧＡ１６０４０８の超硬合金台金にロウ付けして切削工具を作製し、鉄系焼結金属（ＨＲＣ＝６２）の加工テストを行った。加工テスト条件は切削速度Vc=130m/min、送りf=0.1mm/rev、切り込みap=0.05mmである。その結果を表２に示す。
【００１６】
【表１】
【表２】
表２に示すように立方晶窒化硼素９７体積％以下の本発明立方晶窒化硼素焼結体１〜３、比較立方晶窒化硼素焼結体１は焼結可能であった。なお、配合組成よりも立方晶窒化硼素焼結体に含まれる立方晶窒化硼素量が減少している。これは焼結によって立方晶窒化硼素の一部が、結合相の原料粉末と反応したためである。本発明立方晶窒化硼素焼結体１〜３、比較立方晶窒化硼素焼結体１のＸ線回折図形において、立方晶窒化硼素以外に、Ｂ6Ｃｏ21Ｗ2、ＷＣ、ＡｌＮ、ＢＣｏＷが観察されたことから、本発明立方晶窒化硼素焼結体１〜３、比較立方晶窒化硼素焼結体１は、立方晶窒化硼素と、Ｂ6Ｃｏ21Ｗ2、ＷＣ、ＡｌＮおよびＢＣｏＷからなる結合相とで構成された立方晶窒化硼素焼結体であることが分かる。得られた立方晶窒化硼素焼結体の比抵抗は８〜１０Ω・ｃｍであり、ワイヤーカット放電加工することが可能であった。鉄系焼結金属加工テストにおいて、立方晶窒化硼素８８〜９５体積％の本発明立方晶窒化硼素焼結体１〜３は、立方晶窒化硼素８３体積％の比較立方晶窒化硼素焼結体１に対して１．６〜２倍の性能が得られた。
【００１９】
【実施例２】
市販の平均粒径２μｍの立方晶窒化硼素粉末、平均粒径２μｍのＷＣ粉末、平均粒径１．５μｍのＣｏ粉末、平均粒径４μｍのＡｌ粉末を用意する。立方晶窒化硼素：９５．４体積％、ＷＣ：０．７体積％、Ｃｏ：２．５体積％、Ａｌ：１．４体積％と配合した原料粉末をウレタン内張りボールミルで湿式混合し、乾燥した混合粉末を金属カプセルに充填した後、超高圧高温発生装置の容器内に挿入し、表３に示す圧力と温度、保持時間：３０分という条件で焼結した。焼結体として得られた本発明立方晶窒化硼素焼結体４〜６、比較立方晶窒化硼素焼結体４、５を研磨した後、Ｘ線回折測定および比抵抗測定を行った。各試料のＸ線回折強度比Ｉｗ／Ｉｂ、比抵抗を表３に示した。なお、本発明立方晶窒化硼素焼結体４〜６、比較立方晶窒化硼素焼結体４、５は、立方晶窒化硼素：９２体積％と、Ｂ6Ｃｏ21Ｗ2、ＷＣ、ＡｌＮおよびＢＣｏＷからなる結合相：８体積％とで構成された立方晶窒化硼素焼結体であった。試験荷重：４．９０Ｎ、荷重保持時間：１５秒の試験条件でヌープ硬さ（Ｈｋ）を測定し、その値を表３に示した。
【００２０】
【表３】
Ｘ線回折強度比Ｉｗ／Ｉｂが０．１０〜０．２０である発明立方晶窒化硼素焼結体４〜６は、ヌープ硬さ４１００、比抵抗１０Ω・ｃｍであり、ワイヤーカット放電加工可能であった。Ｉｗ／Ｉｂが０．０５〜０．０７である比較立方晶窒化硼素焼結体４、５は、比抵抗１０００Ω・ｃｍであり、ワイヤーカット放電加工できなかった。
【００２２】
【発明の効果】
本発明立方晶窒化硼素焼結体は、立方晶窒化硼素を８８〜９７体積％含む焼結体でありながら比抵抗が低いという特徴を有する。本発明立方晶窒化硼素焼結体はワイヤーカット放電加工できるため、複雑形状の工具を作製することが可能となった。本発明立方晶窒化硼素焼結体を切削工具として用いると工具寿命が向上するため好ましく、その中でも、特に鉄系焼結金属用切削工具として用いると工具寿命を向上させる効果が高い。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cubic boron nitride sintered body having a high cubic boron nitride content. In particular, the present invention relates to a cubic boron nitride sintered body mainly used for cutting.
[0002]
[Prior art]
In general, a cubic boron nitride sintered body cutting tool cuts a blade-shaped cubic boron nitride sintered body from a cubic boron nitride sintered blank by wire-cut electric discharge machining and brazes it to a cemented carbide base metal. . When wire-cut electric discharge machining cannot be performed, laser-cut machining is performed, but the manufacturing cost increases due to an increase in the width of grinding.
[0003]
As a conventional technique related to a cubic boron nitride sintered body, cubic boron nitride is contained in an amount of 80 to 95% by volume, and the rest is boron nitride, aluminum, and oxides of Group 4a, 5a, and 6a group metal oxides. There is a cubic boron nitride sintered body mainly composed of a compound produced by reaction with at least one of them (see, for example, Patent Document 1). However, when the cubic boron nitride content is 88% by volume or more, there is a problem that the specific resistance increases and wire-cut electric discharge machining becomes difficult.
[0004]
Further, cubic boron nitride is contained in a proportion of 70 to 95% by volume, and the remainder is Co, a cobalt alloy, and Al, and a metal phase of an alloy-forming metal selected from Ni, Mn, Fe, V, and Cr. There is a cubic boron nitride sintered body (see, for example, Patent Document 2). However, when the cubic boron nitride content is 88% by volume or more, there is a problem that the specific resistance increases and wire-cut electric discharge machining becomes difficult.
[0005]
[Patent Document 1]
JP-A-6-1666 [Patent Document 2]
JP-A-53-114589 [0006]
[Problems to be solved by the invention]
The present inventors have attempted to apply a cubic boron nitride sintered body having a high cubic boron nitride content to a cutting tool. However, the cubic boron nitride sintered body having a large cubic boron nitride content has a problem that wire-cut electric discharge machining is difficult because of its high specific resistance. Therefore, an object of the present invention is to provide a cubic boron nitride sintered body having a low specific resistance and a high cubic boron nitride content.
[0007]
[Means for Solving the Problems]
The inventors of the present invention have made researches on a cubic boron nitride sintered body to solve the above-mentioned problems. As a result, in the cubic boron nitride sintered body containing B 6 Co 21 W 2 as a binder phase, cubic nitriding is performed. A finding that the intensity ratio indicating the ratio of the X-ray diffraction intensity of the B 6 Co 21 W 2 (420) plane to the X-ray diffraction intensity of the boron (111) plane affects the specific resistance of the cubic boron nitride sintered body To complete the present invention.
[0008]
That is, the cubic boron nitride sintered body of the present invention is cubic boron nitride: 88 to 97% by volume, and at least one selected from W, Co, Al carbides, nitrides, borides, and solid solutions thereof. binder phase and inevitable impurities consisting of seeds: a cubic boron nitride sintered body is composed of a balance, the binder phase with contains B 6 Co 21 W 2, of the B 6 Co 21 W 2 (420 ) Plane X-ray diffraction intensity is expressed as Iw, and cubic boron nitride (111) plane X-ray diffraction intensity is expressed as Ib. The intensity ratio Iw / Ib indicating the ratio of Iw to Ib is 0.10 to 0.00. 40.
[0009]
When the amount of cubic boron nitride contained in the cubic boron nitride sintered body of the present invention is less than 88% by volume, the wear resistance is lowered, and when it exceeds 97% by volume, the binder phase is relatively reduced and the sinterability is reduced. descend. Therefore, the cubic boron nitride content was set to 88 to 97% by volume. Among them, the cubic boron nitride content is preferably 93 to 95% by volume.
[0010]
The binder phase of the cubic boron nitride sintered body of the present invention is at least one selected from carbides, nitrides, borides, and solid solutions of W, Co, and Al, and has an affinity for cubic boron nitride. High heat resistance. Specific examples include AlB 2 , AlN, BCoW, B 2 CoW 2 , B 3 CoW 3 , B 6 Co 21 W 2 , B 6 CoW 3 , B 10 CoW 9 , and WC. Among these, it is particularly preferable that B 6 Co 21 W 2 is a main component.
[0011]
The cubic boron nitride sintered body of the present invention is subjected to X-ray diffraction measurement with Kα rays of a Cu target, the X-ray diffraction intensity of the (420) plane of B 6 Co 21 W 2 is Iw, and (111) of cubic boron nitride When the X-ray diffraction intensity of the surface is expressed as Ib, if the intensity ratio Iw / Ib indicating the ratio of Iw to Ib is less than 0.1, the specific resistance increases and wire-cut electric discharge machining becomes difficult. When Iw / Ib exceeds 0.4, the hardness of the cubic boron nitride sintered body decreases, and when used as a cutting tool, the wear resistance decreases. Therefore, Iw / Ib was set to 0.1 to 0.4. In addition to the X-ray diffraction pattern of cubic boron nitride and B 6 Co 21 W 2 , AlB 2 , AlN, BCoW, B 2 CoW 2 , B 3 CoW 3 , B 6 CoW 3 , B 10 CoW 9 , WC X-ray diffraction patterns may be observed.
[0012]
The specific resistance of the cubic boron nitride sintered body of the present invention is not less than 5 × 10 −6 Ω · cm, and when it exceeds 10 Ω · cm, the wire-cut electric discharge machining efficiency is significantly lowered. Therefore, the specific resistance is preferably 5 × 10 −6 to 10 Ω · cm.
[0013]
When the Knoop hardness of the cubic boron nitride sintered body of the present invention measured under the test conditions of test load: 4.90 N and load holding time: 15 seconds is 3900 or more, the wear resistance is improved. Moreover, since it is difficult for Knoop hardness to exceed 4300, Knoop hardness is preferable in the range of 3900-4300.
[0014]
The cubic boron nitride sintered body of the present invention is preferably used as a cutting tool because it has high sharp corner strength and excellent fracture resistance. When used as a cutting tool, the surface accuracy of the workpiece is excellent. Since the cubic boron nitride sintered body of the present invention can be subjected to wire-cut electric discharge machining, it can be machined into a more complicated tool shape than a conventional cubic boron nitride sintered body that can only be laser-cut. The cubic boron nitride sintered body of the present invention is particularly preferably used as a cutting tool for processing a very hard difficult-to-cut material having an HRC of 50 or more typified by an iron-based sintered metal and a high-hardness high-speed roll. More preferably, it is used as a cutting tool for bonded metal.
[0015]
[Example 1]
Commercially available cubic boron nitride powder having an average particle diameter of 2 μm, WC powder having an average particle diameter of 2 μm, Co powder having an average particle diameter of 1.5 μm, and Al powder having an average particle diameter of 4 μm are prepared. As shown in Table 1, powder A and cubic boron nitride (cBN) powder blended so as to have a volume ratio of WC: Co: Al = 2: 7: 5 were blended. The blended raw material powder is wet-mixed in a urethane-lined ball mill, and the dried mixed powder is filled into a metal capsule, and then inserted into a container of an ultra-high pressure and high temperature generator, pressure 6 GPa, temperature 1600 ° C., holding time 30 minutes. Sintered under sintering conditions. The inventive cubic boron nitride sintered bodies 1 to 3 and the comparative cubic boron nitride sintered body 1 obtained as the sintered bodies were polished and subjected to X-ray diffraction measurement. Table 2 shows the intensity ratio Iw / Ib when the X-ray diffraction intensity of the (420) plane of B 6 Co 21 W 2 is expressed as Iw and the X-ray diffraction intensity of the (111) plane of cubic boron nitride is expressed as Ib. It was. Also, the polished surface is observed with a scanning electron microscope equipped with an energy dispersive X-ray analyzer and a wavelength dispersive X-ray analyzer, and the amount of cubic boron nitride (cBN) contained in the cubic boron nitride sintered body is measured. did. Furthermore, Knoop hardness (Hk) and specific resistance were measured under test conditions of test load: 4.90 N and load holding time: 15 seconds. The results are shown in Table 2. The cubic boron nitride sintered bodies 1 to 3 of the present invention and the comparative cubic boron nitride sintered body 1 are cut into equilateral triangles having a side of 5 mm and a thickness of 1 mm, and brazed to a cemented carbide base metal having a chip shape of TNGA160408. A cutting tool was prepared, and a processing test of an iron-based sintered metal (HRC = 62) was performed. The machining test conditions are cutting speed Vc = 130 m / min, feed f = 0.1 mm / rev, and cutting ap = 0.05 mm. The results are shown in Table 2.
[0016]
[Table 1]
[Table 2]
As shown in Table 2, the cubic boron nitride sintered bodies 1 to 3 of the present invention and the comparative cubic boron nitride sintered body 1 having a volume of 97% by volume or less of cubic boron nitride could be sintered. Note that the amount of cubic boron nitride contained in the cubic boron nitride sintered body is smaller than the blend composition. This is because a part of cubic boron nitride reacted with the raw material powder of the binder phase by sintering. In addition to the cubic boron nitride, B 6 Co 21 W 2 , WC, AlN, and BCoW are observed in the X-ray diffraction patterns of the cubic boron nitride sintered bodies 1 to 3 and the comparative cubic boron nitride sintered body 1. Therefore, the cubic boron nitride sintered bodies 1 to 3 of the present invention and the comparative cubic boron nitride sintered body 1 are bonded with cubic boron nitride and B 6 Co 21 W 2 , WC, AlN and BCoW. It can be seen that this is a cubic boron nitride sintered body composed of phases. The resulting cubic boron nitride sintered body had a specific resistance of 8 to 10 Ω · cm, and could be wire cut electric discharge processed. In the iron-based sintered metal processing test, the cubic boron nitride sintered bodies 1 to 3 of the present invention having a cubic boron nitride of 88 to 95% by volume were compared with the comparative cubic boron nitride sintered body 1 of 83% by volume of cubic boron nitride. 1.6 to 2 times the performance was obtained.
[0019]
[Example 2]
Commercially available cubic boron nitride powder having an average particle diameter of 2 μm, WC powder having an average particle diameter of 2 μm, Co powder having an average particle diameter of 1.5 μm, and Al powder having an average particle diameter of 4 μm are prepared. Raw material powder blended with cubic boron nitride: 95.4% by volume, WC: 0.7% by volume, Co: 2.5% by volume, Al: 1.4% by volume was wet mixed in a urethane-lined ball mill and dried. After the mixed powder was filled in the metal capsule, it was inserted into a container of an ultrahigh pressure and high temperature generator, and sintered under the conditions of pressure and temperature shown in Table 3 and holding time: 30 minutes. After grinding the cubic boron nitride sintered bodies 4 to 6 of the present invention and the comparative cubic boron nitride sintered bodies 4 and 5 obtained as sintered bodies, X-ray diffraction measurement and specific resistance measurement were performed. Table 3 shows the X-ray diffraction intensity ratio Iw / Ib and the specific resistance of each sample. The cubic boron nitride sintered bodies 4 to 6 of the present invention and the comparative cubic boron nitride sintered bodies 4 and 5 are cubic boron nitride: 92% by volume, B 6 Co 21 W 2 , WC, AlN and BCoW. It was a cubic boron nitride sintered body composed of a binder phase consisting of 8 vol%. The Knoop hardness (Hk) was measured under the test conditions of test load: 4.90 N, load holding time: 15 seconds, and the values are shown in Table 3.
[0020]
[Table 3]
Inventive cubic boron nitride sintered bodies 4 to 6 having an X-ray diffraction intensity ratio Iw / Ib of 0.10 to 0.20 have a Knoop hardness of 4100 and a specific resistance of 10 Ω · cm, and are capable of wire-cut electric discharge machining. there were. Comparative cubic boron nitride sintered bodies 4 and 5 having Iw / Ib of 0.05 to 0.07 had a specific resistance of 1000 Ω · cm, and could not be wire cut electric discharge machined.
[0022]
【The invention's effect】
The cubic boron nitride sintered body of the present invention is characterized by having a low specific resistance despite being a sintered body containing 88 to 97% by volume of cubic boron nitride. Since the cubic boron nitride sintered body of the present invention can be wire-cut electric discharge machined, it becomes possible to produce a tool having a complicated shape. The cubic boron nitride sintered body of the present invention is preferably used as a cutting tool because the tool life is improved, and among them, the effect of improving the tool life is particularly high when used as a cutting tool for iron-based sintered metal.
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| US20070032369A1 (en) * | 2005-08-03 | 2007-02-08 | Franzen Jan M | High content CBN materials, compact incorporating the same and methods of making the same |
| JP5664795B2 (en) | 2011-11-07 | 2015-02-04 | 株式会社タンガロイ | Cubic boron nitride sintered body |
| JP6095162B2 (en) | 2013-03-29 | 2017-03-15 | 住友電工ハードメタル株式会社 | Cubic boron nitride sintered body |
| CN106414371B (en) * | 2014-06-27 | 2019-07-19 | 京瓷株式会社 | Cubic boron nitride sintered compact and cutting element |
| WO2016084738A1 (en) * | 2014-11-25 | 2016-06-02 | 京セラ株式会社 | cBN SINTERED COMPACT AND CUTTING TOOL |
| EP3854899A4 (en) | 2018-09-19 | 2022-06-15 | Sumitomo Electric Industries, Ltd. | Cubic boron nitride sintered body and cutting tool containing this |
| KR102124566B1 (en) * | 2018-11-07 | 2020-06-18 | 일진다이아몬드(주) | Manufacturing Methods of cBN Sintered Tool With High Hardness |
| JP6900590B1 (en) | 2020-03-24 | 2021-07-07 | 昭和電工株式会社 | Cubic boron nitride sintered body, its manufacturing method, and tools |
| WO2022091257A1 (en) * | 2020-10-28 | 2022-05-05 | 住友電工ハードメタル株式会社 | Cubic boron nitride sintered body, tool including cubic boron nitride sintered body, and method for manufacturing cubic boron nitride sintered body |
| DE112021006652T5 (en) * | 2020-12-25 | 2023-10-12 | Kyocera Corporation | Insert and a cutting tool |
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