JP2861486B2 - High hardness sintered cutting tool - Google Patents
High hardness sintered cutting toolInfo
- Publication number
- JP2861486B2 JP2861486B2 JP3153099A JP15309991A JP2861486B2 JP 2861486 B2 JP2861486 B2 JP 2861486B2 JP 3153099 A JP3153099 A JP 3153099A JP 15309991 A JP15309991 A JP 15309991A JP 2861486 B2 JP2861486 B2 JP 2861486B2
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- body layer
- cutting tool
- cutting
- binder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】この発明は、立方晶窒化硼素（以
下、ｃＢＮと称する）を用いた高硬度焼結体切削工具の
改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a cutting tool of a high hardness sintered body using cubic boron nitride (hereinafter referred to as cBN).
【０００２】[0002]
【従来の技術】ｃＢＮは、ダイヤモンドに次ぐ高硬度物
質であり、その焼結体は種々の切削工具に使用されてい
る。近年、超高圧焼結の技術を用いて微細なｃＢＮ粒子
を金属で結合した焼結体や種々のセラミックスで結合し
た焼結体が市販されている。これらの市販ｃＢＮ焼結体
を機械加工用工具として用いる場合、切れ刃となる部分
のみにｃＢＮを含有する硬質層を設け、これを剛性の高
い母材に接合した複合材として工具を構成する。2. Description of the Related Art cBN is a hard material next to diamond, and its sintered body is used for various cutting tools. In recent years, a sintered body in which fine cBN particles are bonded with a metal or a sintered body in which various ceramics are bonded using ultra-high pressure sintering technology is commercially available. When these commercially available cBN sintered bodies are used as machining tools, a hard layer containing cBN is provided only in a portion serving as a cutting edge, and the tool is formed as a composite material in which this is joined to a highly rigid base material.
【０００３】図４は従来の切削工具の刃先部分を示す部
分斜視図である。図４を参照して、ｃＢＮ焼結体からな
る刃先部２０は超硬合金からなる母材５０に接合されて
いる。刃先部２０は切れ刃２０ｃを境としてすくい面２
０ａと逃げ面２０ｂを構成する。FIG. 4 is a partial perspective view showing a cutting edge portion of a conventional cutting tool. Referring to FIG. 4, cutting edge portion 20 made of a cBN sintered body is joined to base material 50 made of a cemented carbide. The cutting edge 20 is a rake face 2 with the cutting edge 20c as a boundary.
0a and the flank 20b.
【０００４】図５は図４に示された工具を用いた切削状
況を示す部分断面図である。図５に示すように、被削材
１００は矢印の方向に高速度で回転している。この回転
している被削材１００に刃先部２０が入り込むように切
削工具の母材５０が設けられる。刃先部２０のすくい面
２０ａの上方に切屑１０１が発生する。切削時間の経過
に伴って、すくい面２０ａにすくい面摩耗３１が生ず
る。また、すくい面２０ａと交差する逃げ面２０ｂには
逃げ面摩耗３２が生ずる。FIG. 5 is a partial sectional view showing a cutting state using the tool shown in FIG. As shown in FIG. 5, the work material 100 is rotating at a high speed in the direction of the arrow. The base material 50 of the cutting tool is provided so that the cutting edge portion 20 enters the rotating work material 100. Chips 101 are generated above the rake face 20 a of the cutting edge 20. As the cutting time elapses, rake face wear 31 occurs on the rake face 20a. In addition, flank wear 32 occurs on the flank 20b intersecting with the rake face 20a.
【０００５】これらの摩耗の状態は図６に示される。被
削材１００の表面に接する切れ刃２０ｃを境にすくい面
（クレータ）摩耗３１と逃げ面摩耗３２が生ずる。一
方、被削材１００の表面に接する部分と周囲の空気に接
する部分との境界部には境界摩耗３３が生ずる。このよ
うに、切削時間の経過に伴って、刃先部に一様な摩耗が
生ずるのではなく、局所的に摩耗が進行する。[0005] The state of these wears is shown in FIG. Rake surface (crater) wear 31 and flank surface wear 32 occur at the cutting edge 20 c in contact with the surface of the work material 100. On the other hand, boundary wear 33 occurs at the boundary between the portion in contact with the surface of the work material 100 and the portion in contact with the surrounding air. As described above, as the cutting time elapses, the wear does not occur uniformly at the cutting edge, but locally progresses.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、従来の
切削工具においては、刃先部２０は一様な組成を有する
ｃＢＮ焼結体から構成されている。そのため、上記３つ
の摩耗のうち、いずれかの摩耗が局部的に進行すれば、
切削不能になるという問題点があった。したがって、そ
の寿命が比較的短くなるという問題点があった。However, in a conventional cutting tool, the cutting edge portion 20 is made of a cBN sintered body having a uniform composition. Therefore, if any of the three wears locally progresses,
There was a problem that cutting became impossible. Therefore, there is a problem that the life is relatively short.
【０００７】そこで、この発明の目的は、上記のような
問題点を解消することであり、局部的な摩耗の進行によ
る寿命の低下を防止するとともに、切削工具の寿命をよ
り長くすることが可能な高硬度焼結体切削工具の構造を
提供することである。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and to prevent a reduction in the life due to the progress of local wear and to prolong the life of a cutting tool. It is an object of the present invention to provide a structure of a high-hardness sintered compact cutting tool.
【０００８】[0008]
【課題を解決するための手段】本願発明者らは、上述の
目的を達成するために鋭意検討した結果、すくい面を構
成する焼結体層と、逃げ面を主に構成する焼結体層との
ｃＢＮの体積含有率を異ならせれば、従来のｃＢＮ焼結
体からなる切削工具よりも寿命が長くなることを見出し
た。Means for Solving the Problems The inventors of the present invention have made intensive studies to achieve the above-mentioned object, and as a result, a sintered body layer constituting a rake face and a sintered body layer mainly constituting a flank face have been obtained. It has been found that if the volume content of cBN is different, the life is longer than that of a cutting tool made of a conventional cBN sintered body.
【０００９】すなわち、この発明に従った高硬度焼結体
切削工具は、第１の焼結体層と、第２の焼結体層とを備
える。第１の焼結体層は立方晶窒化硼素を７５体積％以
上９８体積％未満含有し、残部が第１の結合材からな
る。第２の焼結体層は第１の焼結体層に接合され、立方
晶窒化硼素を４０体積％以上６５体積％未満含有し、残
部が第２の結合材からなる。第１の結合材は、Ａｌを３
重量％以上４０重量％以下含有し、残部が、（Ｔｉ，
Ｍ）Ｃ、（Ｔｉ，Ｍ）Ｎおよび（Ｔｉ，Ｍ）（ＣＮ）か
らなる群から選択された１種以上のＴｉ化合物と不可避
不純物とからなる。ここで、ＭはＴｉ以外の周期律表第
ＩＶａ、Ｖａ、ＶＩａ族の遷移金属元素である。第２の
結合材は、Ａｌを２重量％以上３０重量％以下含有し、
残部が、（Ｔｉ，Ｘ）Ｃ、（Ｔｉ，Ｘ）Ｎおよび（Ｔ
ｉ，Ｘ）（ＣＮ）からなる群から選択された１種以上の
Ｔｉ化合物と不可避不純物とからなる。ここで、ＸはＴ
ｉ以外の周期律表第ＩＶａ、Ｖａ、ＶＩａ族の遷移金属
元素である。That is, a cutting tool for a high-hardness sintered body according to the present invention includes a first sintered body layer and a second sintered body layer. The first sintered body layer contains cubic boron nitride in an amount of 75% by volume or more and less than 98% by volume, and the remainder is made of the first binder. The second sintered body layer is joined to the first sintered body layer, contains cubic boron nitride in an amount of 40% by volume or more and less than 65% by volume, and the remainder is made of the second binder. The first binder is made of Al
% By weight and 40% by weight or less, with the balance being (Ti,
M) One or more Ti compounds selected from the group consisting of C, (Ti, M) N and (Ti, M) (CN) and unavoidable impurities. Here, M is a transition metal element of Groups IVa, Va and VIa of the periodic table other than Ti. The second binder contains 2% by weight or more and 30% by weight or less of Al,
The remainder is (Ti, X) C, (Ti, X) N and (T
It comprises one or more Ti compounds selected from the group consisting of i, X) (CN) and unavoidable impurities. Where X is T
It is a transition metal element of Groups IVa, Va and VIa of the periodic table other than i.
【００１０】上記のように構成された第１の焼結体層と
第２の焼結体層とが切削工具の刃先部を構成する。第１
の焼結体層の主表面がすくい面を構成するように配され
る。第１の焼結体層の厚みは０．０４ｍｍ以上０．２ｍ
ｍ未満である。The first sintered body layer and the second sintered body layer configured as described above constitute the cutting edge of the cutting tool. First
Are arranged such that the main surface of the sintered body layer forms a rake face. The thickness of the first sintered body layer is 0.04 mm or more and 0.2 m
m.
【００１１】好ましくは、上記ＭはＷであり、上記Ｘは
Ｈｆである。Preferably, M is W and X is Hf.
【００１２】[0012]
【作用】この発明の高硬度焼結体切削工具においては、
第１の焼結体層の主表面がすくい面を構成する。この第
１の焼結体層を構成するｃＢＮの体積含有率は第２の焼
結体層に比べて高くなっている。ｃＢＮは化学的に安定
であるため、境界摩耗やすくい面摩耗に対する耐性は、
第２の焼結体層よりも第１の焼結体層のほうが強くな
る。In the cutting tool for a high-hardness sintered compact according to the present invention,
The main surface of the first sintered body layer forms a rake face. The volume content of cBN constituting the first sintered body layer is higher than that of the second sintered body layer. Since cBN is chemically stable, resistance to boundary wear and surface wear is
The first sintered body layer is stronger than the second sintered body layer.
【００１３】一方、第２の焼結体層を構成するｃＢＮの
体積含有率は第１の焼結体層よりも低く、ｃＢＮ粒子が
強固に結合材により保持されている。そのため、第２の
焼結体層においては、ｃＢＮの結合力の低下が防止され
るので、ｃＢＮ粒子の脱落が生じにくくなっている。そ
の結果、第２の焼結体層の表面においては逃げ面摩耗が
第１の焼結体層に比べて進行し難くなる。On the other hand, the volume content of cBN constituting the second sintered body layer is lower than that of the first sintered body layer, and the cBN particles are firmly held by the binder. For this reason, in the second sintered body layer, a decrease in the bonding strength of cBN is prevented, so that cBN particles are less likely to fall off. As a result, flank wear is less likely to progress on the surface of the second sintered body layer than on the first sintered body layer.
【００１４】このように、この発明の切削工具において
は、摩耗部位に応じてｃＢＮ焼結体層が刃先部分を構成
する。これにより、局部的な摩耗の進行が防止され、切
削工具の寿命が長くなる。As described above, in the cutting tool of the present invention, the cBN sintered body layer forms the cutting edge portion according to the worn portion. This prevents local wear from progressing and extends the life of the cutting tool.
【００１５】また、この発明においては、すくい面を構
成する第１の焼結体層の厚みが０．０４ｍｍ以上０．２
ｍｍ未満である。第１の焼結体層の厚みが０．０４ｍｍ
未満であると、すくい面摩耗や境界摩耗が第１の焼結体
層の厚み以上の摩耗量で発生する可能性があるので、好
ましくない。また、第１の焼結体層の厚みが０．２ｍｍ
を超えると、第１の焼結体層の主表面に交差する面にお
いて逃げ面摩耗が進行しやすくなるので好ましくない。In the present invention, the thickness of the first sintered layer constituting the rake face is 0.04 mm or more and 0.2 mm or more.
mm. The thickness of the first sintered body layer is 0.04 mm
If it is less than 1, the rake face wear and the boundary wear may occur with a wear amount larger than the thickness of the first sintered body layer, which is not preferable. The thickness of the first sintered body layer is 0.2 mm
Exceeding flares is not preferred because the flank wear tends to progress on the surface intersecting the main surface of the first sintered body layer.
【００１６】また、第１の焼結体層のｃＢＮの体積含有
率は７５体積％以上９８体積％未満である。ｃＢＮが７
５体積％未満では、化学的に安定なｃＢＮの量が相対的
に少なくなり、すくい面摩耗が生じやすくなる。ｃＢＮ
が９８体積％を超えると、結合材の量が相対的に低下
し、ｃＢＮ粒子の結合強度が低下する。The volume content of cBN in the first sintered body layer is at least 75% by volume and less than 98% by volume. cBN is 7
If it is less than 5% by volume, the amount of chemically stable cBN is relatively small, and rake face wear is likely to occur. cBN
Exceeds 98% by volume, the amount of the binder is relatively reduced, and the bond strength of the cBN particles is reduced.
【００１７】さらに、第２の焼結体層のｃＢＮの体積含
有率は４０体積％以上６５体積％未満である。ｃＢＮが
４０体積％未満であると、焼結体の強度および硬度が低
下し、相対的に結合材が多くなることにより、たとえば
高硬度鋼等を切削した場合機械的摩耗の進展が早くなっ
たりする。ｃＢＮが６５体積％を超えると、耐すくい面
摩耗は向上するものの、ｃＢＮ粒子を保持している結合
材とｃＢＮの結合強度が低下し、ｃＢＮ粒子の脱落が生
じる。Further, the volume content of cBN in the second sintered body layer is 40% by volume or more and less than 65% by volume. If the cBN is less than 40% by volume, the strength and hardness of the sintered body are reduced, and the amount of the binder is relatively increased. For example, when high-hardness steel or the like is cut, the progress of mechanical wear is accelerated. I do. If the cBN content exceeds 65% by volume, the rake face wear is improved, but the bonding strength between the binder holding the cBN particles and cBN is reduced, and the cBN particles fall off.
【００１８】第１の結合材はＡｌを３重量％以上４０重
量％以下含有する。Ａｌが３重量％未満であれば、Ａｌ
とｃＢＮの反応が不十分なため、結合材によるｃＢＮの
保持力が弱くなる。Ａｌが４０重量％を超えると、焼結
後に生じた生成物ＡｌＢ2 等が多くなり、相対的にＡｌ
Ｂ2 等よりも耐摩耗性に優れた（Ｔｉ，Ｍ）Ｃ，（Ｔ
ｉ，Ｍ）（ＣＮ），（Ｔｉ，Ｍ）Ｎ化合物の含有量が低
下するので充分な耐摩耗性が得られないのに加えて耐ク
レータ摩耗性も低下する。The first binder contains 3% by weight or more and 40% by weight or less of Al. If Al is less than 3% by weight, Al
And cBN are insufficiently reacted with each other, so that the holding power of cBN by the binder is weakened. If the content of Al exceeds 40% by weight, the amount of products such as AlB 2 generated after sintering increases, and
Excellent wear resistance than 2 mag B (Ti, M) C, (T
Since the contents of the (i, M) (CN) and (Ti, M) N compounds are reduced, sufficient wear resistance cannot be obtained, and crater wear resistance is also reduced.
【００１９】また、第２の結合材はＡｌを２重量％以上
３０重量％以下含有する。Ａｌが２重量％未満であれ
ば、ＡｌとｃＢＮおよび結合材との反応が不十分なた
め、結合材によるｃＢＮの保持力が低下する。Ａｌが３
０重量％を超えると、ＡｌＢ2 等の反応生成物が多くな
り、ｃＢＮと結合材の結合強度は弱くなるものの、Ａｌ
Ｂ 2 等よりも耐摩耗性に優れた（Ｔｉ，Ｍ）Ｃ、（Ｔ
ｉ，Ｍ）ＣＮ，（Ｔｉ，Ｍ）Ｎ化合物の相対的な含有量
が低下するので充分な耐摩耗性が得られない。Further, the second binder contains 2% by weight or more of Al.
Contains up to 30% by weight. Al is less than 2% by weight
If the reaction between Al and cBN and the binder was insufficient,
Therefore, the holding power of cBN by the binder is reduced. Al is 3
If it exceeds 0% by weight, AlBTwoReaction products such as
Although the bonding strength between cBN and the binder is weaker,
B Two(Ti, M) C, (T
Relative content of (i, M) CN, (Ti, M) N compounds
, And sufficient abrasion resistance cannot be obtained.
【００２０】第１の結合材の残部を構成するＴｉ化合物
においてＭがＷであれば、Ｔｉ化合物自体の耐摩耗性が
改善されるので好ましい。第２の結合材を構成するＴｉ
化合物においてＸがＨｆであれば、Ｔｉ化合物の耐熱性
が改善され、特に高速切削等での耐摩耗性が向上するの
で好ましい。If M is W in the Ti compound constituting the remainder of the first binder, it is preferable because the wear resistance of the Ti compound itself is improved. Ti constituting the second binder
When X is Hf in the compound, it is preferable because the heat resistance of the Ti compound is improved, and in particular, the wear resistance in high-speed cutting or the like is improved.
【００２１】[0021]
実施例１ 第１の焼結体層の原料粉末として、Ａｌを１０重量％含
有し、残部が（Ｔｉ，Ｗ）Ｃである結合材粉末と、ｃＢ
Ｎ粉末とを準備した。結合材粉末とｃＢＮ粉末とを体積
比で２０対８０となるように混合した。この混合粉末を
超硬合金製ポットとボールを用いて均一に混合すること
により、所定の粒度を有する第１の焼結体層の原料粉末
を作製した。Example 1 As a raw material powder for a first sintered body layer, a binder material powder containing 10% by weight of Al and the balance being (Ti, W) C;
N powder was prepared. The binder powder and the cBN powder were mixed at a volume ratio of 20:80. This mixed powder was uniformly mixed using a cemented carbide pot and a ball to prepare a raw material powder of a first sintered body layer having a predetermined particle size.
【００２２】次に、第２の焼結体層の結合材粉末とし
て、表１に示される組成を有するように、Ｔｉを含有す
る炭化物、窒化物、炭窒化物またはこれらの固溶体粉末
とアルミニウム粉末との混合粉末を準備した。この結合
材粉末とｃＢＮ粉末とを体積比で４５対５５となるよう
に配合し、これを超硬合金製ポットとボールを用いて均
一混合することにより、所定の粒度を有する第２の焼結
体層の原料粉末を準備した。Next, as the binder powder of the second sintered body layer, a carbide, nitride, carbonitride or a solid solution powder of these containing Ti and aluminum powder having a composition shown in Table 1 are used. To prepare a mixed powder. The binder powder and the cBN powder are blended in a volume ratio of 45:55, and are uniformly mixed using a cemented carbide pot and a ball, so that a second sintered material having a predetermined particle size is obtained. Raw material powder for the body layer was prepared.
【００２３】その後、Ｍｏ製の容器に超硬合金からなる
円板を入れた後、第２の焼結体層の原料粉末、第１の焼
結体層の原料粉末の順に混合粉末を充填した。次に、こ
の容器を超高圧・高温装置に入れ、圧力５０ｋｂ、温度
１３００℃で１５分間焼結した。Thereafter, a disc made of a cemented carbide was put into a container made of Mo, and then the mixed powder was filled in the order of the raw material powder for the second sintered body layer and the raw material powder for the first sintered body layer. . Next, the container was placed in an ultra-high pressure / high temperature apparatus and sintered at a pressure of 50 kb and a temperature of 1300 ° C. for 15 minutes.
【００２４】得られた焼結体の組織を観察したところ、
超硬合金上に上記２種の混合粉末に対応する２層構造を
有する焼結体が強固に接合していることが確認された。When the structure of the obtained sintered body was observed,
It was confirmed that a sintered body having a two-layer structure corresponding to the above two kinds of mixed powders was firmly joined to the cemented carbide.
【００２５】各焼結体の第１層の主表面がすくい面を構
成し、かつその厚みが０．０５ｍｍとなるように加工
し、切削加工用の各チップを作製した。切削加工用の各
チップが超硬合金母材に取付けられた切削工具を用い
て、直径が１００ｍｍのダクタイル鋳鉄（ＦＣＤ６０）
材からなる丸棒の外周を切削した。切削条件は、切削速
度：３００ｍ／ｍｉｎ、切込み：０．３５ｍｍ、送り：
０．２ｍｍ／ｒｅｖ、湿式で切削時間は３０分間であっ
た。３０分間切削後の刃先の摩耗状態と欠損の有無を測
定したところ、表１に示す結果が得られた。Each of the sintered bodies was machined so that the main surface of the first layer constituted a rake face and had a thickness of 0.05 mm to produce chips for cutting. Ductile cast iron (FCD60) with a diameter of 100 mm using a cutting tool in which each chip for cutting is attached to a cemented carbide base material.
The outer periphery of a round bar made of a material was cut. The cutting conditions were as follows: cutting speed: 300 m / min, depth of cut: 0.35 mm, feed:
0.2 mm / rev, wet cutting time was 30 minutes. When the wear state of the cutting edge after cutting for 30 minutes and the presence or absence of chipping were measured, the results shown in Table 1 were obtained.
【００２６】[0026]
【表１】 [Table 1]
【００２７】実施例２ 第２の焼結体層の結合材粉末として、（Ｔｉ，Ｈｆ）Ｃ
粉末とアルミニウム粉末とを重量比で９対１の割合で混
合した粉末を準備した。この結合材粉末とｃＢＮ粉末と
を体積比で４０対６０となるように配合し、これを超硬
合金製ポットとボールを用いて均一に混合することによ
り、第２の焼結体層の原料粉末を準備した。Example 2 (Ti, Hf) C was used as the binder powder for the second sintered body layer.
A powder was prepared by mixing powder and aluminum powder at a weight ratio of 9: 1. The binder material powder and the cBN powder are blended in a volume ratio of 40:60, and the mixture is uniformly mixed using a cemented carbide pot and a ball to obtain a raw material for the second sintered body layer. Powder was prepared.
【００２８】次に、第１の焼結体層の結合材粉末とし
て、表２に示される組成を有するように、各試料毎にＴ
ｉを含有する炭化物、窒化物、炭窒化物またはこれらの
固溶体粉末とアルミニウム粉末とを混合することにより
準備した。これらの結合材粉末とｃＢＮ粉末とを体積比
で７８対２２の割合で配合し、これを超硬合金製ポット
とボールを用いて均一に混合することにより、第１の焼
結体層の原料粉末を作製した。Next, as the binder powder of the first sintered body layer, T was used for each sample so as to have the composition shown in Table 2.
Prepared by mixing carbide, nitride, carbonitride or their solid solution powder containing i with aluminum powder. The binder powder and the cBN powder are blended at a volume ratio of 78:22, and the mixture is uniformly mixed using a cemented carbide pot and a ball to obtain a raw material for the first sintered body layer. A powder was made.
【００２９】実施例１と同様に、Ｍｏ製の容器内に超硬
合金からなる円板を入れた後、その上に第２の焼結体層
の原料粉末を充填し、さらにその上に第１の焼結体層の
原料粉末を充填した。その後、この容器を超高圧・高温
装置に入れ、圧力４５ｋｂ、温度１３００℃で２０分間
焼結した。In the same manner as in Example 1, a disc made of a cemented carbide is placed in a container made of Mo, and then the raw material powder of the second sintered body layer is filled thereon, and further the second sintered body layer is placed thereon. The raw material powder of the first sintered body layer was filled. Thereafter, the container was placed in an ultrahigh pressure / high temperature apparatus and sintered at a pressure of 45 kb and a temperature of 1300 ° C. for 20 minutes.
【００３０】得られた焼結体の組織を観察したところ、
超硬合金上に上記２種の混合粉末に対応する２層構造を
有する焼結体が強固に接合していることが確認された。When the structure of the obtained sintered body was observed,
It was confirmed that a sintered body having a two-layer structure corresponding to the above two kinds of mixed powders was firmly joined to the cemented carbide.
【００３１】上記各焼結体を切削加工用チップに加工し
た。各焼結体の第１層がすくい面を構成し、かつその厚
みが表２に示される厚みとなるように、切削加工用の各
チップを作製した。各チップが超硬合金母材に取付けら
れた切削工具を用いて、直径が１００ｍｍのインコネル
７１８材からなる丸棒の外周を切削した。切削条件は、
切削速度：１７０ｍ／ｍｉｎ、切込み：０．２０ｍｍ、
送り：０．１２ｍｍ／ｒｅｖ、湿式であった。切削可能
時間を測定し、切削が不可能になった原因を調査したと
ころ、表２に示す結果が得られた。Each of the above sintered bodies was processed into a cutting tip. Each chip for cutting was produced such that the first layer of each sintered body constituted a rake face and the thickness was as shown in Table 2. The outer periphery of a round bar made of Inconel 718 material having a diameter of 100 mm was cut using a cutting tool in which each chip was attached to a cemented carbide base material. Cutting conditions are
Cutting speed: 170 m / min, depth of cut: 0.20 mm,
Feed: 0.12 mm / rev, wet type. When the possible cutting time was measured and the cause of the impossible cutting was investigated, the results shown in Table 2 were obtained.
【００３２】[0032]
【表２】 [Table 2]
【００３３】比較例の試料Ｎｏ．１５においては、第１
の焼結体層の厚みが薄いため、境界摩耗の進行が著し
く、寿命が短くなったものと考えられる。比較例の試料
Ｎｏ．１６では、第１の焼結体層の結合材においてアル
ミニウムの含有量が多いため、第１の焼結体層のすくい
面摩耗の進行が著しかった。比較例の試料Ｎｏ．１７で
は、第１の焼結体層のアルミニウムの含有量が少ないた
め、結合強度が低下し、欠損を招いたものと考えられ
る。比較例の試料Ｎｏ．１８では、第１の焼結体層の厚
みが大きいので、逃げ面摩耗の進行が著しかった。Sample No. of Comparative Example In No. 15, the first
It is considered that, since the thickness of the sintered body layer was thin, boundary wear progressed remarkably and the life was shortened. Sample No. of Comparative Example In No. 16, since the content of aluminum in the binder of the first sintered body layer was large, the rake face wear of the first sintered body layer progressed remarkably. Sample No. of Comparative Example In No. 17, it is considered that since the aluminum content of the first sintered body layer was small, the bonding strength was reduced and the fracture was caused. Sample No. of Comparative Example In No. 18, the flank wear progressed remarkably because the thickness of the first sintered body layer was large.
【００３４】実施例３ 第１の焼結体層の結合材粉末として、Ａｌを１５重量％
含有し、残部が（ＴｉＨｆ）Ｃである粉末を準備した。
この結合材粉末とｃＢＮ粉末とを体積比で表３に示され
る配合比となるように混合することにより、各試料の第
１の焼結体層の原料粉末を作製した。Example 3 Al was 15% by weight as a binder powder for the first sintered body layer.
The powder which contained and the balance was (TiHf) C was prepared.
By mixing the binder material powder and the cBN powder so as to have a compounding ratio shown in Table 3 by volume ratio, a raw material powder of a first sintered body layer of each sample was prepared.
【００３５】第２の焼結体層の結合材粉末として、Ａｌ
を１０重量％含有し、残部が（ＴｉＷ）（ＣＮ）である
粉末を準備した。この結合材粉末とｃＢＮ粉末とを体積
比で表３で示される組成を有するように配合し、これを
超硬合金製ポットとボールを用いて均一に混合すること
により、第２の焼結体層の原料粉末を各試料毎に作製し
た。As the binder powder of the second sintered body layer, Al
, And the balance was (TiW) (CN). The binder material and the cBN powder are mixed in a volume ratio so as to have the composition shown in Table 3, and are uniformly mixed using a cemented carbide pot and a ball to form a second sintered body. The raw material powder of the layer was prepared for each sample.
【００３６】次に、Ｍｏ製の容器内にＷＣ−８重量％Ｃ
ｏ組成の超硬合金からなる円板を入れた後、その上面に
第２の焼結体層の原料粉末を充填し、さらに第１の焼結
体層の原料粉末を充填した。その後、この容器を超高圧
・高温装置に入れ、圧力４５ｋｂ、温度１２５０℃で２
０分間焼結した。Next, WC-8% by weight C was placed in a container made of Mo.
After a disk made of a cemented carbide having an o-composition was placed, the upper surface was filled with the raw material powder for the second sintered body layer, and further filled with the raw material powder for the first sintered body layer. Thereafter, the container was placed in an ultra-high pressure / high temperature apparatus and subjected to a pressure of 45 kb and a temperature of
Sintered for 0 minutes.
【００３７】得られた焼結体の組織を観察したところ、
超硬合金上に上記２種の混合粉末に対応する２層構造を
有する焼結体が強固に接合していることが確認された。When the structure of the obtained sintered body was observed,
It was confirmed that a sintered body having a two-layer structure corresponding to the above two kinds of mixed powders was firmly joined to the cemented carbide.
【００３８】上記各焼結体を切削加工用チップに加工し
た。各焼結体の第１層がすくい面を構成し、かつその厚
みが０．０５ｍｍとなるように加工し、切削加工用の各
チップを作製した。各チップが超硬合金母材に取付けら
れた切削工具を用いて、直径が１００ｍｍのダクタイル
鋳鉄（ＦＣＤ４５）材からなる丸棒の外周を切削した。
切削条件は、切削速度：３５０ｍ／ｍｉｎ、切込み：
０．３ｍｍ、送り：０．２ｍｍ／ｒｅｖ、湿式であっ
た。切削可能であった時間を測定したところ、表３に示
す結果が得られた。Each of the above sintered bodies was processed into a chip for cutting. The first layer of each sintered body constituted a rake face and was processed to have a thickness of 0.05 mm, thereby producing each chip for cutting. The outer periphery of a round bar made of ductile cast iron (FCD45) having a diameter of 100 mm was cut using a cutting tool in which each chip was attached to a cemented carbide base material.
The cutting conditions were as follows: cutting speed: 350 m / min, cutting depth:
0.3 mm, feed: 0.2 mm / rev, wet type. When the time during which cutting was possible was measured, the results shown in Table 3 were obtained.
【００３９】[0039]
【表３】 [Table 3]
【００４０】この発明による切削工具の刃先部を構成す
る焼結体の構造は図１に示される。刃先部１０は、ｃＢ
Ｎを体積で高濃度に含有する第１の焼結体層１１と、ｃ
ＢＮを体積で低濃度に含有する第２の焼結体層１２とか
ら構成される。第１の焼結体層１１の厚みは０．０４ｍ
ｍ以上０．２ｍｍ未満である。FIG. 1 shows the structure of the sintered body constituting the cutting edge of the cutting tool according to the present invention. The blade tip 10 is cB
A first sintered body layer 11 containing N in a high concentration by volume;
And a second sintered body layer 12 containing BN at a low concentration by volume. The thickness of the first sintered body layer 11 is 0.04 m
m or more and less than 0.2 mm.
【００４１】図２は、図１に示された刃先部１０を超硬
合金母材に取付けた状態を示す部分斜視図である。第１
の焼結体層１１の主表面がすくい面１０ａを構成する。
切れ刃１０ｃを境にすくい面１０ａと隣合う逃げ面１０
ｂは、主に第２の焼結体層１２から構成される。このよ
うな配置になるように２層構造の焼結体からなる刃先部
１０が母材５０に取付けられる。FIG. 2 is a partial perspective view showing a state where the cutting edge portion 10 shown in FIG. 1 is attached to a cemented carbide base material. First
The main surface of the sintered body layer 11 constitutes the rake face 10a.
The flank 10 adjacent to the rake face 10a with the cutting edge 10c as a boundary
b is mainly composed of the second sintered body layer 12. The cutting edge portion 10 made of a sintered body having a two-layer structure is attached to the base material 50 so as to have such an arrangement.
【００４２】図３はこの発明の切削工具を用いた切削状
況を示す部分断面図である。切れ刃１０ｃが被削材１０
０の表面に入り込むように刃先部１０が設けられる。す
くい面１０ａを構成する第１の焼結体層１１の上方に切
屑１０１が発生する。FIG. 3 is a partial sectional view showing a cutting state using the cutting tool of the present invention. The cutting edge 10c is the work material 10
The blade edge portion 10 is provided so as to enter the surface of the zero. Chips 101 are generated above the first sintered body layer 11 constituting the rake face 10a.
【００４３】[0043]
【発明の効果】以上のように、この発明によれば、摩耗
部位に応じて２層構造の焼結体から切削工具の刃先部が
構成されるので、局部的に著しく摩耗が進行せず、切削
工具の寿命を長くすることが可能になる。As described above, according to the present invention, the cutting edge of the cutting tool is formed from a sintered body having a two-layer structure in accordance with the wear site, so that wear does not locally proceed remarkably. It is possible to extend the life of the cutting tool.
【図１】この発明に従った切削工具の刃先部を構成する
焼結体の構造を示す断面図である。FIG. 1 is a cross-sectional view showing a structure of a sintered body constituting a cutting edge portion of a cutting tool according to the present invention.
【図２】この発明に従った切削工具を示す部分斜視図で
ある。FIG. 2 is a partial perspective view showing a cutting tool according to the present invention.
【図３】この発明の切削工具を用いて被削材が切削され
る状況を示す部分断面図である。FIG. 3 is a partial cross-sectional view showing a state where a work material is cut using the cutting tool of the present invention.
【図４】従来の切削工具を示す部分斜視図である。FIG. 4 is a partial perspective view showing a conventional cutting tool.
【図５】従来の切削工具を用いて被削材を切削する状態
を示す部分断面図である。FIG. 5 is a partial cross-sectional view showing a state of cutting a work material using a conventional cutting tool.
【図６】切削工具の刃先部における摩耗部位を概念的に
示す図である。FIG. 6 is a view conceptually showing a worn portion in a cutting edge portion of a cutting tool.
図において、１０は刃先部、１０ａはすくい面、１０ｂ
は逃げ面、１０ｃは切れ刃、１１は第１の焼結体層、１
２は第２の焼結体層を示す。In the drawing, 10 is a blade edge portion, 10a is a rake face, 10b
Is a flank, 10c is a cutting edge, 11 is a first sintered body layer, 1
Reference numeral 2 denotes a second sintered body layer.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B23B 27/14 C04B 35/58──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) B23B 27/14 C04B 35/58
Claims (3)
積％未満含有し、残部が第１の結合材からなる第１の焼
結体層と、立方晶窒化硼素を４０体積％以上６５体積％
未満含有し、残部が第２の結合材からなり、前記第１の
焼結体層に接合された第２の焼結体層とを備え、前記第
１の結合材は、Ａｌを３重量％以上４０重量％以下含有
し、残部が、（Ｔｉ，Ｍ）Ｃ、（Ｔｉ，Ｍ）Ｎおよび
（Ｔｉ，Ｍ）（ＣＮ）からなる群から選択された１種以
上のＴｉ化合物（ただし、ＭはＴｉ以外の周期律表第Ｉ
Ｖａ、Ｖａ、ＶＩａ族の遷移金属元素である）と不可避
不純物とからなり、前記第２の結合材は、Ａｌを２重量
％以上３０重量％以下含有し、残部が、（Ｔｉ，Ｘ）
Ｃ、（Ｔｉ，Ｘ）Ｎおよび（Ｔｉ，Ｘ）（ＣＮ）からな
る群から選択された１種以上のＴｉ化合物（ただし、Ｘ
はＴｉ以外の周期律表第ＩＶａ、Ｖａ、ＶＩａ族の遷移
金属元素である）と不可避不純物とからなり、前記第１
および第２の焼結体層が刃先部を構成し、前記第１の焼
結体層の主表面がすくい面を構成するように配され、前
記第１の焼結体層の厚みが０．０４ｍｍ以上０．２ｍｍ
未満である、高硬度焼結体切削工具。1. A first sintered body layer containing cubic boron nitride in an amount of 75% by volume or more and less than 98% by volume, the balance being a first binder, and 40% by volume or more and 65% by volume of cubic boron nitride. %
A second sintered material layer joined to the first sintered material layer, wherein the first binder material contains 3% by weight of Al. At least 40% by weight, with the balance being at least one Ti compound selected from the group consisting of (Ti, M) C, (Ti, M) N and (Ti, M) (CN) (where M Is periodic table I other than Ti
Va, Va, and VIa transition metal elements) and unavoidable impurities. The second binder contains Al in an amount of 2% by weight or more and 30% by weight or less, with the balance being (Ti, X)
One or more Ti compounds selected from the group consisting of C, (Ti, X) N and (Ti, X) (CN) (where X
Is a transition metal element belonging to Groups IVa, Va, and VIa of the periodic table other than Ti) and unavoidable impurities.
And the second sintered body layer constitute a cutting edge portion, and the main surface of the first sintered body layer is arranged so as to constitute a rake face, and the thickness of the first sintered body layer is 0.1 mm. 04mm or more 0.2mm
High-hardness sintered compact cutting tool that is less than.
硬度焼結体切削工具。2. The cutting tool according to claim 1, wherein M is W.
高硬度焼結体切削工具。3. The cutting tool according to claim 1, wherein X is Hf.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3153099A JP2861486B2 (en) | 1991-06-25 | 1991-06-25 | High hardness sintered cutting tool |
| DE69205075T DE69205075T2 (en) | 1991-06-25 | 1992-06-24 | Hard sintered compact for tools. |
| EP92110630A EP0520403B1 (en) | 1991-06-25 | 1992-06-24 | Hard sintered compact for tools |
| US07/904,353 US5395700A (en) | 1991-06-25 | 1992-06-25 | Hard sintered compact for tools |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3153099A JP2861486B2 (en) | 1991-06-25 | 1991-06-25 | High hardness sintered cutting tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH054101A JPH054101A (en) | 1993-01-14 |
| JP2861486B2 true JP2861486B2 (en) | 1999-02-24 |
Family
ID=15554956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3153099A Expired - Lifetime JP2861486B2 (en) | 1991-06-25 | 1991-06-25 | High hardness sintered cutting tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2861486B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4927559B2 (en) * | 2004-10-28 | 2012-05-09 | 京セラ株式会社 | Cubic boron nitride sintered body and cutting tool using the same |
| CN101336311A (en) * | 2005-12-12 | 2008-12-31 | 六号元素（产品）（控股）公司 | Pcbn cutting tool components |
| JP5462622B2 (en) * | 2006-04-21 | 2014-04-02 | エレメント シックス （プロダクション）（プロプライエタリィ） リミテッド | Cubic boron nitride composite material and tool |
| JP5906750B2 (en) * | 2012-01-17 | 2016-04-20 | 三菱マテリアル株式会社 | cBN sintered body cutting tool and method of manufacturing the same |
| JP2013040102A (en) * | 2012-11-19 | 2013-02-28 | Element Six (Production) (Pty) Ltd | Method of making cubic boron nitride compact |
| JP6148101B2 (en) * | 2013-07-26 | 2017-06-14 | 京セラ株式会社 | Cutting tools |
| JP6410210B2 (en) * | 2015-02-19 | 2018-10-24 | 三菱マテリアル株式会社 | Cubic boron nitride composite sintered body insert |
| JP6531478B2 (en) * | 2015-04-14 | 2019-06-19 | 日本製鉄株式会社 | Method for turning metal pipe end portion and method for manufacturing metal pipe |
| JP6986232B2 (en) * | 2018-03-22 | 2021-12-22 | 三菱マテリアル株式会社 | Cubic boron nitride base sintered body and cutting tools made of this |
-
1991
- 1991-06-25 JP JP3153099A patent/JP2861486B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH054101A (en) | 1993-01-14 |
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