JPH10287947A - Cutting tool made of composite cermet, excellent in breakage resistance - Google Patents
Cutting tool made of composite cermet, excellent in breakage resistanceInfo
- Publication number
- JPH10287947A JPH10287947A JP9745397A JP9745397A JPH10287947A JP H10287947 A JPH10287947 A JP H10287947A JP 9745397 A JP9745397 A JP 9745397A JP 9745397 A JP9745397 A JP 9745397A JP H10287947 A JPH10287947 A JP H10287947A
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- JP
- Japan
- Prior art keywords
- phase
- phases
- forming component
- cermet
- spotted
- 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.)
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- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、すぐれた耐欠損
性を有し、したがって耐欠損性が要求される鋼や鋳鉄な
どの断続切削を高速で行うのに用いた場合にも、切刃に
欠けやチッピング（微小欠け）などの発生なく、すぐれ
た切削性能を長期に亘って発揮する複合サーメット製切
削工具に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting edge which is excellent in chipping resistance even when used for high-speed intermittent cutting of steel or cast iron which requires chipping resistance. The present invention relates to a cutting tool made of a composite cermet that exhibits excellent cutting performance for a long time without occurrence of chipping or chipping (micro chipping).
【０００２】[0002]
【従来の技術】従来、一般に鋼や鋳鉄などの連続切削や
断続切削に炭窒化チタン系サーメット製切削工具が用い
られ、この炭窒化チタン系サーメット製切削工具が、結
合相形成成分としてＣｏおよび／またはＮｉを５〜２０
重量％含有し、残りの主体が分散相形成成分としてのＴ
ｉと、Ｎｂ、Ｔａ、Ｗ、Ｍｏ、Ｚｒ、Ｖ、Ｃｒ、および
Ｈｆのうちの１種以上とのＴｉ系複合炭窒化物固溶体
［以下、（Ｔｉ，Ｍ）ＣＮで示す］からなる炭窒化チタ
ン系サーメットで構成されることもよく知られるところ
である。2. Description of the Related Art Conventionally, a titanium carbonitride-based cermet cutting tool is generally used for continuous or intermittent cutting of steel, cast iron, or the like. Or 5-20 Ni
Wt%, and the remaining main component is T as a dispersed phase forming component.
Carbonitriding made of a Ti-based composite carbonitride solid solution of i and one or more of Nb, Ta, W, Mo, Zr, V, Cr, and Hf [hereinafter, referred to as (Ti, M) CN] It is also well known that it is composed of a titanium-based cermet.
【０００３】[0003]
【発明が解決しようとする課題】一方、近年の切削装置
の高性能化はめざましく、かつ省力化に対する要求も強
く、これに伴い、切削加工は高速化の傾向にあるが、上
記の従来炭窒化チタン系サーメット製切削工具において
は、特にこれを鋼や鋳鉄などの断続切削を高速で行うの
に用いると、靭性不足が原因で切刃に欠けやチッピング
が発生し易く、比較的短時間で使用寿命に至るのが現状
である。On the other hand, in recent years, the performance of cutting equipment has been remarkably improved, and there is a strong demand for labor saving. Accordingly, cutting work tends to be accelerated. Titanium-based cermet cutting tools, especially when used for high-speed intermittent cutting of steel or cast iron, are likely to be chipped or chipped easily due to lack of toughness. It is the present condition that the life is reached.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者等は、
上述のような観点から、特に鋼や鋳鉄などの高速断続切
削に用いても切刃に欠けやチッピングなどの発生なく、
すぐれた耐摩耗性を発揮する切削工具を開発すべく研究
を行った結果、切削工具を、顕微鏡組織上斑点相が分布
し、前記斑点相間にスケルトン構造の連続相が存在する
組織を有すると共に、前記斑点相を、同じく顕微鏡組織
上最長径で測定して２００μｍ以下の大きさをもち、か
つ４０〜２００μｍの範囲内のものが前記連続相との合
量（全体）に占める割合で１０〜５０面積％、望ましく
は１５〜３５面積％を占め、かつ結合相形成成分として
Ｃｏおよび／またはＮｉを５〜２０重量％、望ましくは
６〜１５重量％含有し、残りの主体が分散相形成成分と
してのＷＣからなり、さらに必要に応じてＣｒ、Ｖ、Ｔ
ｉ、Ｎｂ、Ｔａ、およびＺｒの炭化物、並びにＷを含む
これら成分の２種以上の複合炭化物および複合炭窒化物
などのうちの１種または２種以上を微細な分散相形成成
分として含有する超硬合金で構成し、前記連続相を、結
合相形成成分としてＣｏおよび／またはＮｉを５〜２０
重量％、望ましくは８〜１５重量％含有し、残りの主体
が分散相形成成分としての（Ｔｉ，Ｍ）ＣＮ（ただし、
Ｍは、Ｎｂ、Ｔａ、Ｗ、Ｍｏ、Ｚｒ、Ｖ、Ｃｒ、および
Ｈｆのうちの１種以上を示す）からなる炭窒化チタン系
サーメットで構成した複合サーメットで構成すると、こ
の結果の複合サーメット製切削工具は、前記超硬合金の
斑点相によって靭性の著しい向上が図られ、これによっ
てすぐれた耐欠損性を有するようになり、かつ前記炭窒
化チタン系サーメットの連続相によってすぐれた耐摩耗
性が保持されることから、通常の条件での連続切削や断
続切削は勿論のこと、特に鋼や鋳鉄などの断続切削を高
速で行うのに用いた場合にも切刃に欠けやチッピングな
どの発生なく、すぐれた耐摩耗性を示し、長期に亘る切
削加工を可能ならしめるという研究結果を得たのであ
る。Means for Solving the Problems Accordingly, the present inventors have
From the above-mentioned viewpoint, even when used for high-speed interrupted cutting of steel or cast iron, in particular, no chipping or chipping of the cutting edge occurs,
As a result of conducting research to develop a cutting tool exhibiting excellent wear resistance, the cutting tool has a structure in which spot phases are distributed on the microscopic structure, and a continuous phase having a skeleton structure exists between the spot phases. The spotted phase has a size of 200 μm or less, similarly measured at the longest diameter on a microscopic structure, and a size within a range of 40 to 200 μm is a ratio of 10 to 50 in the total amount (total) with the continuous phase. Occupies 5 to 20% by weight, preferably 6 to 15% by weight of Co and / or Ni as a binder phase forming component, and the remaining main component is a dispersed phase forming component. WC, and Cr, V, T
An ultra-fine alloy containing one or more of carbides of i, Nb, Ta, and Zr, two or more of these components including W, and a composite carbonitride thereof as a fine dispersed phase forming component. A hard alloy, wherein the continuous phase contains 5 to 20 Co and / or Ni as a binder phase forming component.
%, Desirably 8 to 15% by weight, and the remaining main component is (Ti, M) CN as a dispersed phase forming component (however,
M represents one or more of Nb, Ta, W, Mo, Zr, V, Cr, and Hf). When the composite cermet is composed of a titanium carbonitride-based cermet, the resulting composite cermet The cutting tool achieves a remarkable improvement in toughness due to the spot phase of the cemented carbide, thereby having excellent fracture resistance, and excellent wear resistance due to the continuous phase of the titanium carbonitride cermet. Because it is retained, not only continuous cutting and interrupted cutting under normal conditions, but also especially when used for high-speed interrupted cutting of steel or cast iron etc. The research results show that it exhibits excellent wear resistance and enables long-term cutting.
【０００５】この発明は、上記の研究結果に基づいてな
されたものであって、顕微鏡組織上、斑点相と、前記斑
点相間に存在するスケルトン構造の連続相からなり、前
記斑点相は、最長径で測定して２００μｍ以下の大きさ
をもち、かつ４０〜２００μｍの範囲内のものが前記連
続相との合量（全体）に占める割合で１０〜５０面積
％、望ましくは１５〜３５面積％を占める組織を有する
複合サーメットで構成し、かつ前記斑点相を、結合相形
成成分としてＣｏおよび／またはＮｉを５〜２０重量
％、望ましくは６〜１５重量％含有し、残りの主体が分
散相形成成分としてのＷＣからなり、さらに必要に応じ
てＣｒ、Ｖ、Ｔｉ、Ｎｂ、Ｔａ、およびＺｒの炭化物、
並びにＷを含むこれら成分の２種以上の複合炭化物およ
び複合炭窒化物などのうちの１種または２種以上を微細
な分散相形成成分として含有する超硬合金で構成し、前
記連続相を、結合相形成成分としてＣｏおよび／または
Ｎｉを５〜２０重量％、望ましくは８〜１５重量％含有
し、残りの主体が分散相形成成分としての（Ｔｉ，Ｍ）
ＣＮ（ただし、Ｍは、Ｎｂ、Ｔａ、Ｗ、Ｍｏ、Ｚｒ、
Ｖ、Ｃｒ、およびＨｆのうちの１種以上を示す）からな
る炭窒化チタン系サーメットで構成してなる、耐摩耗性
のすぐれた複合サーメット製切削工具に特徴を有するも
のである。The present invention has been made based on the above-mentioned research results, and comprises a speckle phase and a continuous phase of a skeleton structure existing between the speckle phases on a microscopic structure, wherein the speckle phase has the longest diameter. Having a size of 200 μm or less as measured by the above, and having a size in the range of 40 to 200 μm accounts for 10 to 50 area%, desirably 15 to 35 area% in a ratio to the total amount (total) with the continuous phase. A composite cermet having an occupied structure, wherein the mottled phase contains 5 to 20% by weight, preferably 6 to 15% by weight of Co and / or Ni as a binder phase forming component, and the remaining main component is a dispersed phase forming. Consisting of WC as a component, and if necessary, carbides of Cr, V, Ti, Nb, Ta, and Zr,
And a cemented carbide containing one or more of two or more of composite carbides and carbonitrides of these components including W as a fine dispersed phase forming component, and the continuous phase is It contains 5 to 20% by weight, preferably 8 to 15% by weight of Co and / or Ni as a binder phase forming component, and the remaining main component is (Ti, M) as a dispersed phase forming component.
CN (where M is Nb, Ta, W, Mo, Zr,
V, Cr, and Hf), which is characterized by a composite cermet cutting tool having excellent wear resistance, which is composed of a titanium carbonitride-based cermet.
【０００６】なお、この発明の切削工具において、斑点
相を構成する超硬合金、並びに連続相を構成する炭窒化
チタン系サーメットのＣｏおよび／またはＮｉの含有量
をいずれも５〜２０重量％としたのは、その含有量が５
重量％未満では焼結性が悪く、所望の強度および靭性を
確保することができず、一方その含有量が２０重量％を
越えると、急激に耐摩耗性が低下するようになるという
理由に基づくものであり、また、斑点相の大きさを、最
長径で測定して（以下同じ）２００μｍ以下としたの
は、その大きさが２００μｍを越えると、これが破壊の
起点となって切刃に欠けやチッピングが発生し易くなる
からであり、さらに４０〜２００μｍの範囲内の大きさ
の斑点相の１０〜５０面積％の割合での分布は、経験的
に定めたものであって、４０〜２００μｍの範囲内の大
きさの斑点相の割合が１０面積％未満では所望のすぐれ
た耐欠損性を確保することができず、一方同じく４０〜
２００μｍの範囲内の大きさの斑点相の割合が５０面積
％を越えると耐摩耗性が低下するようになるという理由
からであり、したがって斑点相の大きさが４０μｍ未満
となってしまった場合、これが１０〜５０面積％の割合
で存在しても所望のすぐれた耐欠損性を確保することが
できないものである。[0006] In the cutting tool of the present invention, the content of Co and / or Ni of the cemented carbide constituting the spotted phase and the content of Co and / or Ni of the titanium carbonitride cermet constituting the continuous phase are all 5 to 20% by weight. The reason is that the content is 5
When the content is less than 20% by weight, the sinterability is poor, and the desired strength and toughness cannot be secured. On the other hand, when the content exceeds 20% by weight, the abrasion resistance rapidly decreases. The size of the speckle phase was measured at the longest diameter (hereinafter the same) and set to 200 μm or less. If the size exceeds 200 μm, this becomes the starting point of destruction and the cutting edge is chipped. This is because chipping and chipping easily occur, and the distribution of the speckle phase having a size in the range of 40 to 200 μm at a ratio of 10 to 50 area% is empirically determined and is 40 to 200 μm. If the proportion of the speckle phase having a size within the range of less than 10% by area, the desired excellent fracture resistance cannot be secured, while the same applies to 40 to 40%.
This is because if the proportion of the speckle phase having a size in the range of 200 μm exceeds 50 area%, the abrasion resistance will be reduced. Therefore, when the size of the speckle phase is less than 40 μm, Even if this is present at a ratio of 10 to 50 area%, a desired excellent fracture resistance cannot be secured.
【０００７】[0007]
【発明の実施の形態】つぎに、この発明の複合サーメッ
ト製切削工具を実施例により具体的に説明する。まず、
連続相形成用原料粉末を形成する目的で、いずれも０．
５〜２μｍの範囲内の平均粒径を有し、かつ市販のＴｉ
ＣＮ（以下、いずれも重量比で、ＴｉＣ／ＴｉＮ＝５０
／５０）粉末、ＴｉＮ粉末、ＴａＣ粉末、ＮｂＣ粉末、
ＷＣ粉末、Ｍｏ2 Ｃ粉末、ＺｒＣ粉末、ＶＣ粉末、（Ｔ
ｉ，Ｔａ，Ｖ）ＣＮ［Ｔｉ／Ｔａ／Ｖ＝７０／２０／１
０、Ｃ／Ｎ＝６０／４０］粉末、（Ｔｉ，Ｎｂ，Ｍｏ）
ＣＮ［Ｔｉ／Ｎｂ／Ｍｏ＝８０／１０／１０、Ｃ／Ｎ＝
５０／５０］粉末、（Ｔｉ，Ｗ）ＣＮ［Ｔｉ／Ｗ＝３０
／７０、Ｃ／Ｎ＝７０／３０］粉末、（Ｔｉ，Ｔａ）Ｃ
Ｎ［Ｔｉ／Ｔａ＝６０／４０、Ｃ／Ｎ＝５０／５０］粉
末、（Ｔｉ，Ｗ，Ｍｏ）ＣＮ［Ｔｉ／Ｗ／Ｍｏ＝７０／
２０／１０、Ｃ／Ｎ＝７０／３０］粉末、（Ｔｉ，Ｔ
ａ，Ｍｏ）ＣＮ［Ｔｉ／Ｔａ／Ｍｏ＝８０／１０／１
０、Ｃ／Ｎ＝５０／５０］粉末、Ｎｉ粉末、およびＣｏ
粉末を用意し、これら原料粉末を表１に示される配合組
成に配合し、ボールミルで７２時間湿式混合し、乾燥し
た後、１０ｋｇ／ｍｍ2 の圧力で圧粉体にプレス成形
し、この圧粉体を、０．０１ｔｏｒｒの真空雰囲気中、
あるいは２０ｔｏｒｒの窒素雰囲気中、１４５０〜１５
５０℃の範囲内の所定温度に２時間保持の条件で焼結し
て、結合相がＮｉ、またはＮｉとＣｏからなり、分散相
の主体が（Ｔｉ，Ｍ）ＣＮからなる炭窒化チタン系サー
メットを形成し、引き続いてこれを市販の粉砕機である
ロールクラッシャーと振動ミルで粉砕し、４４０メッシ
ュの篩（ＪＩＳ・Ｚ８８０１：目開き３２μｍに相当）
にかけることにより、表１に示される平均粒径をもった
連続相形成用原料粉末Ａ〜Ｎをそれぞれ調製した。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a cutting tool made of a composite cermet according to the present invention will be specifically described with reference to examples. First,
In order to form a raw material powder for forming a continuous phase, each of them is used in an amount of 0.1%.
A commercial Ti having an average particle size in the range of
CN (hereinafter, all in weight ratio, TiC / TiN = 50
/ 50) powder, TiN powder, TaC powder, NbC powder,
WC powder, Mo 2 C powder, ZrC powder, VC powder, (T
i, Ta, V) CN [Ti / Ta / V = 70/20/1
0, C / N = 60/40] powder, (Ti, Nb, Mo)
CN [Ti / Nb / Mo = 80/10/10, C / N =
50/50] powder, (Ti, W) CN [Ti / W = 30
/ 70, C / N = 70/30] powder, (Ti, Ta) C
N [Ti / Ta = 60/40, C / N = 50/50] powder, (Ti, W, Mo) CN [Ti / W / Mo = 70 /
20/10, C / N = 70/30] powder, (Ti, T
a, Mo) CN [Ti / Ta / Mo = 80/10/1
0, C / N = 50/50] powder, Ni powder, and Co
Powders are prepared, and these raw material powders are blended in the composition shown in Table 1, wet-mixed in a ball mill for 72 hours, dried, and then pressed into a green compact at a pressure of 10 kg / mm 2. Place the body in a vacuum atmosphere of 0.01 torr,
Alternatively, in a nitrogen atmosphere of 20 torr, 1450 to 15
Sintering is performed at a predetermined temperature within a range of 50 ° C. for 2 hours, and a titanium carbonitride-based cermet in which a binder phase is made of Ni or Ni and Co, and a main component of a dispersed phase is (Ti, M) CN. And subsequently crushed with a roll crusher and a vibrating mill, which are commercially available crushers, and a 440 mesh sieve (JIS Z8801: corresponding to a mesh size of 32 μm).
The raw material powders A to N for forming a continuous phase having the average particle diameters shown in Table 1 were respectively prepared.
【０００８】また、斑点相形成用原料粉末を形成する目
的で、いずれも０．５〜５μｍの範囲内の平均粒径を有
し、かつ市販のＷＣ粉末、ＴｉＣ粉末、ＴａＣ粉末、Ｚ
ｒＣ粉末、ＶＣ粉末、Ｃｒ3 Ｃ2 粉末、（Ｗ，Ｔｉ）Ｃ
［ＷＣ／ＴｉＣ＝７０／３０］粉末、（Ｗ，Ｔｉ，Ｔ
ａ）Ｃ［ＷＣ／ＴｉＣ／ＴａＣ＝５０／３０／２０］粉
末、（Ｔａ，Ｎｂ）Ｃ［ＴａＣ／ＮｂＣ＝９０／１０］
（Ｗ，Ｔｉ）ＣＮ［Ｗ／Ｔｉ＝７０／３０、Ｃ／Ｎ＝７
０／３０］粉末、およびＣｏ粉末を用意し、これら原料
粉末を表２に示される配合組成に配合し、ボールミルで
２４時間湿式混合し、乾燥した後、１０ｋｇ／ｍｍ2 の
圧力で圧粉体にプレス成形し、この圧粉体を、０．０１
ｔｏｒｒの真空雰囲気中、あるいは５ｔｏｒｒの窒素雰
囲気中、１３５０〜１４５０℃の範囲内の所定温度に２
時間保持の条件で焼結して、結合相がＣｏからなり、分
散相の主体がＷＣからなる超硬合金を形成し、引き続い
てこれを市販の粉砕機であるロールクラッシャーと振動
ミルで粉砕し、７０〜３９０メッシュの篩（ＪＩＳ・Ｚ
８８０１：目開き２１２〜３８μｍに相当）を用い、同
じく表２に示される粒度分布範囲内の粒度をもつように
篩分することにより斑点相形成用原料粉末ａ〜ｎをそれ
ぞれ調製した。Further, for the purpose of forming a raw material powder for forming a spot phase, each of them has an average particle size in the range of 0.5 to 5 μm and is commercially available WC powder, TiC powder, TaC powder, Z
rC powder, VC powder, Cr 3 C 2 powder, (W, Ti) C
[WC / TiC = 70/30] powder, (W, Ti, T
a) C [WC / TiC / TaC = 50/30/20] powder, (Ta, Nb) C [TaC / NbC = 90/10]
(W, Ti) CN [W / Ti = 70/30, C / N = 7
0/30] powder and Co powder are prepared, and these raw material powders are blended in the blending composition shown in Table 2, wet-mixed in a ball mill for 24 hours, dried, and then compacted at a pressure of 10 kg / mm 2. And press-mold this compact to 0.01
In a vacuum atmosphere of torr or a nitrogen atmosphere of 5 torr, a predetermined temperature within a range of 1350 to 1450 ° C.
By sintering under the condition of holding time, a cemented carbide composed of Co as the binder phase and WC as the main component of the dispersed phase is formed, which is subsequently pulverized by a commercially available pulverizer such as a roll crusher and a vibration mill. , 70-390 mesh sieve (JIS Z
8801: Equivalent to 212 to 38 μm), and sieved so as to have a particle size within the particle size distribution range shown in Table 2 to prepare spotted phase forming raw material powders a to n, respectively.
【０００９】ついで、上記の連続相形成用原料粉末Ａ〜
Ｎと斑点相形成用原料粉末ａ〜ｎとをそれぞれ表３に示
される割合に相互に配合し、市販のロータリーミキサー
混合機を用いて乾式混合した後、１０ｋｇ／ｍｍ2 の圧
力で圧粉体にプレス成形し、この圧粉体を、０．０１ｔ
ｏｒｒの真空雰囲気中、あるいは１０ｔｏｒｒの窒素雰
囲気中、１４５０〜１５５０℃の範囲内の所定温度に２
時間保持の条件で焼結し、これに研削加工を施すことに
よりＩＳＯ規格ＳＰＧＮ１２０４０８の形状をもった本
発明複合サーメット製切削工具（以下、本発明切削工具
と云う）１〜７および同ＳＮＧＮ１２０４０８の形状を
もった本発明切削工具８〜１４をそれぞれ製造した。ま
た、比較の目的で、表４に示される通り上記の連続相形
成用原料粉末Ａ〜Ｎだけを使用する以外は同一の条件で
従来炭窒化チタン系サーメット製切削工具（以下、従来
切削工具と云う）１〜７および従来切削工具８〜１４を
それぞれ製造した。Next, the raw material powders A to A for forming the continuous phase are described.
N and the raw material powders a to n for speckle phase formation were mixed with each other in the proportions shown in Table 3 and dry-blended using a commercially available rotary mixer mixer, and then compacted at a pressure of 10 kg / mm 2. And press-mold this compact into 0.01t
In a vacuum atmosphere of orr, or a nitrogen atmosphere of 10 torr, a predetermined temperature in the range of 1450 to 1550 ° C.
By sintering under the condition of holding time and subjecting to grinding, the cutting tools made of the composite cermet of the present invention (hereinafter referred to as the cutting tools of the present invention) 1 to 7 having the shape of ISO standard SPGN120408 and the shapes of the SNGN 120408 are provided. The cutting tools 8 to 14 of the present invention each having the following were manufactured. For the purpose of comparison, as shown in Table 4, under the same conditions except that only the above-mentioned raw material powders A to N for forming a continuous phase were used, a conventional titanium carbonitride-based cermet cutting tool (hereinafter referred to as a conventional cutting tool) was used. 1) to 7) and conventional cutting tools 8 to 14 respectively.
【００１０】つぎに、この結果得られた本発明切削工具
１〜１４について、その任意箇所を走査型電子顕微鏡
（倍率：２００倍）で観察し、その組織を写真撮影し、
この組織写真に班点相が存在するものについては、それ
ぞれの班点相の最長径を測定して、これを最長径：２０
０μｍ超のもの、同４０〜２００μｍのもの、そして１
０〜４０μｍ未満のものに区分（１０μｍ未満のものは
正確な測定が困難のため測定せず）すると共に、それぞ
れの分布割合（面積率）を画像解析装置を用いて測定し
た。これらの測定結果を表３に示した。なお、従来切削
工具１〜１４には班点相が存在しないことは勿論のこと
である。Next, with respect to the cutting tools 1 to 14 of the present invention obtained as a result, arbitrary positions thereof were observed with a scanning electron microscope (magnification: 200 times), and the structure was photographed.
In the case where a spot phase exists in this organization photograph, the longest diameter of each spot phase is measured, and the longest diameter: 20
Over 0 μm, 40-200 μm, and 1
The samples were classified into those having a size of 0 to less than 40 μm (those having a size of less than 10 μm were not measured because accurate measurement was difficult), and the respective distribution ratios (area ratios) were measured using an image analyzer. Table 3 shows the results of these measurements. It is needless to say that the conventional cutting tools 1 to 14 do not have the spot phase.
【００１１】さらに、本発明切削工具１〜７および従来
切削工具１〜７については、 被削材：ＳＣＭ４４０の長さ方向等間隔４本縦溝入り丸
棒、 切削速度：２８０ｍ／ｍｉｎ、 送り：０．２ｍｍ／ｒｅｖ、 切込み：２ｍｍ、 切削時間：３ｍｉｎ、 の条件で合金鋼の高速断続切削試験を行い、また、本発
明切削工具８〜１４および従来切削工具８〜１４につい
ては、 被削材：ＦＣ３００の角材、 切削速度：３５０ｍ／ｍｉｎ、 送り：０．２ｍｍ／刃、 切込み：２．５ｍｍ、 切削時間：３０ｍｉｎ、 の条件で鋳鉄の高速フライス切削（断続切削）試験を行
い、いずれの試験でも切刃の逃げ面摩耗幅を測定した。Further, for the cutting tools 1 to 7 of the present invention and the conventional cutting tools 1 to 7, a work material: a round bar having four longitudinal grooves at equal intervals in the longitudinal direction of the SCM440, a cutting speed of 280 m / min, and a feed of: A high-speed intermittent cutting test of the alloy steel was performed under the conditions of 0.2 mm / rev, depth of cut: 2 mm, and cutting time: 3 min. Also, for the cutting tools 8 to 14 of the present invention and the conventional cutting tools 8 to 14, : Square bar of FC300, Cutting speed: 350m / min, Feeding: 0.2mm / tooth, Depth of cut: 2.5mm, Cutting time: 30min. However, the flank wear width of the cutting blade was measured.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【表２】 [Table 2]
【００１４】[0014]
【表３】 [Table 3]
【００１５】[0015]
【表４】 [Table 4]
【００１６】[0016]
【発明の効果】表３、４に示される結果から、本発明切
削工具１〜１４は、超硬合金で構成された班点相の存在
によって耐欠損性が要求される高速断続切削において
も、切刃に欠けやチッピングの発生なく、すぐれた耐摩
耗性を示すのに対して、前記班点相の存在がなく、実質
的に炭窒化チタン系サーメットで構成された従来切削工
具１〜１４においては、いずれも靭性不足が原因で切刃
に欠けやチッピングの発生が避けられず、比較的短時間
で使用寿命に至ることが明らかである。上述のように、
この発明の複合サーメット製切削工具は、通常の条件で
の連続切削および断続切削は勿論のこと、特に鋼や鋳鉄
などの高速断続切削でも著しくすぐれた耐摩耗性を示
し、長期に亘ってすぐれた切削性能を発揮するので、切
削装置の高性能化および切削加工の省力化に満足に対応
することができるものである。According to the results shown in Tables 3 and 4, the cutting tools 1 to 14 of the present invention can be used in high-speed interrupted cutting in which fracture resistance is required due to the presence of a speckle phase made of cemented carbide. In the conventional cutting tools 1 to 14 which are excellent in abrasion resistance without occurrence of chipping or chipping in the cutting edge, and which do not have the spot phase, and which are substantially composed of a titanium carbonitride cermet. It is evident that in any case, chipping or chipping is inevitable in the cutting blade due to insufficient toughness, resulting in a relatively short service life. As mentioned above,
The cutting tool made of a composite cermet of the present invention shows excellent wear resistance not only in continuous cutting and interrupted cutting under normal conditions, but also particularly in high-speed interrupted cutting of steel or cast iron, and has excellent properties over a long period of time. Since the cutting performance is exhibited, it is possible to satisfactorily cope with higher performance of the cutting device and labor saving of the cutting process.
Claims (1)
に存在するスケルトン構造の連続相からなり、前記斑点
相は、最長径で測定して２００μｍ以下の大きさをも
ち、かつ４０〜２００μｍの範囲内のものが前記連続相
との合量（全体）に占める割合で１０〜５０面積％を占
める組織を有する複合サーメットで構成し、かつ前記斑
点相を、結合相形成成分としてＣｏおよび／またはＮｉ
を５〜２０重量％含有し、残りの主体が分散相形成成分
としての炭化タングステンからなる超硬合金で構成し、
前記連続相を、結合相形成成分としてＣｏおよび／また
はＮｉを５〜２０重量％含有し、残りの主体が分散相形
成成分としてのＴｉと、Ｎｂ、Ｔａ、Ｗ、Ｍｏ、Ｚｒ、
Ｖ、Ｃｒ、およびＨｆのうちの１種以上とのＴｉ系複合
炭窒化物固溶体からなる炭窒化チタン系サーメットで構
成したことを特徴とする耐欠損性のすぐれた複合サーメ
ット製切削工具。1. A microscopic structure comprising a speckle phase and a continuous phase having a skeleton structure existing between the speckle phases, wherein the speckle phase has a size of 200 μm or less as measured at the longest diameter, and 40 to 200 μm. Are composed of a composite cermet having a structure occupying 10 to 50 area% of the total amount with the continuous phase (total), and the spotted phase is composed of Co and / or Or Ni
And 5 to 20% by weight, and the remaining main body is made of a cemented carbide made of tungsten carbide as a dispersed phase forming component,
The continuous phase contains 5 to 20% by weight of Co and / or Ni as a binder phase forming component, and the remaining main components are Ti as a dispersed phase forming component, Nb, Ta, W, Mo, Zr,
A cutting tool made of a composite cermet having excellent fracture resistance, comprising a titanium carbonitride-based cermet comprising a Ti-based composite carbonitride solid solution with at least one of V, Cr, and Hf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9745397A JPH10287947A (en) | 1997-04-15 | 1997-04-15 | Cutting tool made of composite cermet, excellent in breakage resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9745397A JPH10287947A (en) | 1997-04-15 | 1997-04-15 | Cutting tool made of composite cermet, excellent in breakage resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10287947A true JPH10287947A (en) | 1998-10-27 |
Family
ID=14192736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9745397A Withdrawn JPH10287947A (en) | 1997-04-15 | 1997-04-15 | Cutting tool made of composite cermet, excellent in breakage resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10287947A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6797369B2 (en) * | 2001-09-26 | 2004-09-28 | Kyocera Corporation | Cemented carbide and cutting tool |
-
1997
- 1997-04-15 JP JP9745397A patent/JPH10287947A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6797369B2 (en) * | 2001-09-26 | 2004-09-28 | Kyocera Corporation | Cemented carbide and cutting tool |
| US7018726B2 (en) | 2001-09-26 | 2006-03-28 | Kyocera Corporation | Cemented carbide and cutting tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20040706 |