JPH1110409A - Ceramics cutting tool and manufacture thereof - Google Patents
Ceramics cutting tool and manufacture thereofInfo
- Publication number
- JPH1110409A JPH1110409A JP9168582A JP16858297A JPH1110409A JP H1110409 A JPH1110409 A JP H1110409A JP 9168582 A JP9168582 A JP 9168582A JP 16858297 A JP16858297 A JP 16858297A JP H1110409 A JPH1110409 A JP H1110409A
- Authority
- JP
- Japan
- Prior art keywords
- sic
- less
- cutting
- cutting tool
- whisker
- 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.)
- Pending
Links
Landscapes
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はセラミックス切削工
具及びその製造方法に関し、詳しくは高速切削で耐摩耗
性、耐欠損性に優れ、且つコストを引き下げた炭化珪素
ウィスカー強化アルミナ系切削工具及びその製造方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic cutting tool and a method for manufacturing the same, and more particularly, to a silicon carbide whisker-reinforced alumina-based cutting tool which is excellent in wear resistance and chipping resistance by high-speed cutting and has a reduced cost, and its manufacture. About the method.
【０００２】[0002]
【従来の技術】Ａｌ2 Ｏ3 や、Ａｌ2 Ｏ3 −ＴｉＣ、Ｓ
ｉ3 Ｎ4 等からなるセラミックス切削工具は、耐酸化性
に富み、耐熱性も高く、高温で高硬度を有することか
ら、特に高速で使用する切削工具として重要な位置づけ
となってきている。しかしながら、これらのセラミック
ス切削工具は上記利点を持ちながらも、Ａｌ2 Ｏ3 やＡ
ｌ2 Ｏ3 −ＴｉＣセラミックスは、耐欠損性に劣り、Ｓ
ｉ3 Ｎ4 は鉄との反応性が高いため耐摩耗性が劣るとい
う欠点を持つため、その使用領域は極めて限定されたも
のといえる。 2. Description of the Related Art Al 2 O 3 , Al 2 O 3 —TiC, S
A ceramic cutting tool made of i 3 N 4 or the like has an important position as a cutting tool used particularly at high speed because of its excellent oxidation resistance, high heat resistance, and high hardness at high temperatures. However, these ceramic cutting tools have the above-mentioned advantages, but also have Al 2 O 3 and A
l 2 O 3 —TiC ceramics have poor fracture resistance and
Since i 3 N 4 has a high reactivity with iron and has a drawback of poor abrasion resistance, its use area can be said to be extremely limited.
【０００３】Ａｌ2 Ｏ3 系セラミックスの耐摩耗性の改
善に関しては、ＺｒＯ2 、ＳｉＣウィスカー、ＳｉＣウ
ィスカーとＺｒＯ2 の同時複合等の複合高靭化、高強度
化が試みられ、それぞれの領域で実用化されている。例
えば、ＵＳＰ４２１８２５３には高靭性、高強度化され
たＡｌ2 Ｏ3 −ＺｒＯ2 セラミックスが提案され、また
特開昭６１−１７４１６５、ＵＳＰ４９６１７５７には
Ａｌ2 Ｏ3 −ＳｉＣウィスカー切削工具、特開平２−１
３９１０２にはＡｌ2 Ｏ3 −ＳｉＣウィスカー−ＺｒＯ
2 切削工具が提案され、ＳｉＣウィスカーを複合した複
合セラミックスの場合、特に超合金等の難削材やねずみ
鋳鉄の高速切削等に優れた性能を示している。しかしＳ
ｉＣウィスカーを複合したＡｌ2 Ｏ3 系セラミックス切
削工具は、ＳｉＣウィスカー原料が高価なため、他のセ
ラミックス切削工具に比べ価格が高く、Ｎｉ基超合金の
切削を除いては市場で十分広く使用されるまでには至っ
ていないのが現状である。In order to improve the abrasion resistance of Al 2 O 3 ceramics, it has been attempted to increase the toughness and strength of composites such as ZrO 2 , SiC whiskers, and the simultaneous composite of SiC whiskers and ZrO 2. Has been put to practical use. For example, high toughness in USP4218253, high strength have been Al 2 O 3 -ZrO 2 ceramic is proposed, also JP 61-174165, Al 2 O 3 -SiC whisker cutting tool in USP4961757, JP-2- 1
Al 2 O 3 in thirty-nine thousand one hundred and two -SiC whiskers -ZrO
Two cutting tools have been proposed, and in the case of composite ceramics obtained by compounding SiC whiskers, they show excellent performance especially for difficult-to-cut materials such as superalloys and high-speed cutting of gray cast iron. But S
iC whisker Al 2 O 3 based ceramic cutting tool that combines, since SiC whisker material is expensive, high price compared with other ceramics cutting tools, well widely used in the market with the exception of the cutting Ni-base superalloys The situation is not yet reached.
【０００４】[0004]
【発明が解決しようとする課題】従って本発明の目的
は、高価なＳｉＣウィスカーの使用量に注目して、ねず
み鋳鉄やダクタイル鋳鉄等の鉄系被削材の切削に十分な
コスト／パーフォーマンスを与えるＳｉＣウィスカー強
化Ａｌ2 Ｏ3 系セラミックス切削工具及びその製造方法
を提供することである。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to pay attention to the amount of expensive SiC whiskers and to provide sufficient cost / performance for cutting iron-based work materials such as gray cast iron and ductile cast iron. An object of the present invention is to provide a SiC whisker reinforced Al 2 O 3 ceramic cutting tool and a method for producing the same.
【０００５】[0005]
【課題を解決するための手段】本発明は、Ａｌ2 Ｏ3 −
ＳｉＣウィスカー系切削工具において、ＳｉＣウィスカ
ーの使用を切削工具の切れ刃の部分に限定させてできる
だけ原料コストを抑え、安価なＡｌ2 Ｏ3 −ＳｉＣウィ
スカー系切削工具を提供することを目的としてなされた
ものである。SUMMARY OF THE INVENTION The present invention provides an Al 2 O 3 −
In SiC whisker-based cutting tool, was made to limit the use of SiC whiskers in the portion of the cutting edge of the cutting tool is suppressed as much as possible raw material costs, to provide an inexpensive Al 2 O 3 -SiC whiskers based cutting tools for the purpose Things.
【０００６】本発明に係るＡｌ2 Ｏ3 −ＳｉＣウィスカ
ー系切削工具は、厚さ２ｍｍ以上４ｍｍ以下の切れ刃部
をＡｌ2 Ｏ3 −ＳｉＣウィスカー系材料で構成し、それ
以外をＡｌ2 Ｏ3 系粒子材料で構成したことを特徴とす
る。またその製造方法は、Ａｌ2 Ｏ3 −ＳｉＣウィスカ
ー系材料の混合粉とＡｌ2Ｏ3 −ＳｉＣ粒子系材料の混
合粉を黒鉛ダイス内に積層し、１４００℃以上１８５０
℃以下にて１０分以上５時間以下にて１５０ｋｇ／ｃｍ
2 以上５００ｋｇ／ｃｍ2 以下の圧力下で加圧焼結する
方法に依ることができる。In the Al 2 O 3 -SiC whisker cutting tool according to the present invention, the cutting edge having a thickness of 2 mm or more and 4 mm or less is made of an Al 2 O 3 -SiC whisker material, and the other portions are made of Al 2 O 3. It is characterized by being composed of a system particle material. Further, the manufacturing method is such that a mixed powder of an Al 2 O 3 —SiC whisker-based material and a mixed powder of an Al 2 O 3 —SiC particle-based material are laminated in a graphite die, and 1400 ° C. to 1850 ° C.
150 kg / cm for 10 minutes or more and 5 hours or less at ℃ or less
It can be due to more than 500 kg / cm 2 or less of a method for pressure sintering under pressure.
【０００７】具体的には、本発明の構成は次の通りであ
る。スローアウエイチップにおいて、図１に示すような
すくい面（上下面）と側面とが直交するネガティブタイ
プにおいてはチップ上下面から２ｍｍ以上４ｍｍ以下
（Ｉｗ）までをＡｌ2 Ｏ3 −ＳｉＣウィスカー系材料で
構成し、中心部（Ｉｐ）はＡｌ2 Ｏ3 粒子系材料で構成
する。Specifically, the configuration of the present invention is as follows. In the case of a negative type in which the rake face (upper and lower faces) and the side face are perpendicular to each other as shown in FIG. 1, the area from 2 mm to 4 mm (Iw) from the upper and lower faces of the tip is made of Al 2 O 3 —SiC whisker-based material. The central portion (Ip) is made of an Al 2 O 3 particle material.
【０００８】また、図２に示すようなすくい面（上面）
と側面との角度が鋭角となるポジティブタイプにおいて
は、切れ刃（Ｉｗ）側２ｍｍ以上４ｍｍ以下までをＡｌ
2 Ｏ3 −ＳｉＣウィスカー系材料で構成し、それ以外の
ＩｐをＡｌ2 Ｏ3 粒子系材料で構成する。従って、ネガ
ティブタイプにおいては、構成上厚みが６．３５ｍｍ
（記号で０６）以上のチップに適用できる。一方ポジテ
ィブタイプにおいては、厚みが４．７６ｍｍ（記号で０
４）以上のチップに適用できる。A rake face (upper face) as shown in FIG.
In the positive type where the angle between the edge and the side surface is an acute angle, 2 mm or more and 4 mm or less on the cutting edge (Iw) side
It is composed of a 2 O 3 —SiC whisker-based material, and the other Ip is composed of an Al 2 O 3 particle-based material. Therefore, in the negative type, the thickness is 6.35 mm in composition.
It can be applied to chips (symbol 06) or more. On the other hand, in the positive type, the thickness is 4.76 mm (0 in the symbol).
4) Applicable to the above chips.
【０００９】いずれのタイプの切削工具においても、切
れ刃部分におけるＡｌ2 Ｏ3 −ＳｉＣウィスカー系材料
の厚さは、２ｍｍ未満では十分な刃先強度を維持でき
ず、また４ｍｍを越えて構成しても原料コストを抑える
観点で好ましくない。切れ刃部分に適用されるＡｌ2 Ｏ
3 −ＳｉＣウィスカー系材料においては、ＳｉＣウィス
カーが平均直径０．３μｍ以上１μｍ以下、平均長さ２
μｍ以上５０μｍ以下であることが好ましい。また、Ｓ
ｉＣウィスカーは切れ刃部に対して７体積％以上４０体
積％以下、残りＡｌ2 Ｏ3 からなることが好ましい。Ｓ
ｉＣウィスカーは、平均直径が０．３μｍ未満では靭
性、強度の向上が十分でなく、１μｍより大きければ耐
摩耗性が足らなくなりいずれも好ましくない。また、平
均長さが２μｍ未満ではウィスカー強化の観点で強度の
向上が十分でなく、５０μｍより長ければ強度向上の観
点で欠陥を誘起する確率が高くなりいずれも好ましくな
い。ＳｉＣウィスカーの複合する量は、７体積％未満で
は靭性、強度の向上が十分でなく、４０体積％より多け
れば相対的にＡｌ2 Ｏ3 の量が不足することによって耐
摩耗性が足らなくなりいずれも好ましくない。In any type of cutting tool, if the thickness of the Al 2 O 3 —SiC whisker-based material at the cutting edge portion is less than 2 mm, sufficient edge strength cannot be maintained, and the thickness exceeds 4 mm. However, it is not preferable from the viewpoint of suppressing the raw material cost. Al 2 O applied to the cutting edge
In the 3- SiC whisker-based material, the SiC whisker has an average diameter of 0.3 μm or more and 1 μm or less, and an average length of 2 μm or less.
It is preferable that it is not less than μm and not more than 50 μm. Also, S
It is preferable that the iC whisker is made of 7% by volume or more and 40% by volume or less with respect to the cutting edge portion, and the remaining is made of Al 2 O 3 . S
If the average diameter of the iC whiskers is less than 0.3 μm, the toughness and strength are not sufficiently improved, and if the average diameter is more than 1 μm, the abrasion resistance becomes insufficient and both are not preferred. On the other hand, if the average length is less than 2 μm, the strength is not sufficiently improved from the viewpoint of whisker reinforcement. If the average length is more than 50 μm, the probability of inducing a defect from the viewpoint of strength improvement is high, and neither is preferable. If the composite amount of the SiC whisker is less than 7% by volume, the improvement in toughness and strength is not sufficient, and if it is more than 40% by volume, the amount of Al 2 O 3 is relatively insufficient and the wear resistance becomes insufficient, resulting in a shortage. Is also not preferred.
【００１０】切れ刃部分以外に適用される材料について
は多種の材料を検討した結果、バルク強度が低下しない
よう、切れ刃部との整合性を考慮してＡｌ2 Ｏ3 系材料
を適用することとした。適用されるＡｌ2 Ｏ3 系材料と
しては、Ａｌ2 Ｏ3 やＡｌ 2Ｏ3 −ＺｒＯ2 でもよい
が、切れ刃部と同様の熱膨張係数をもたせる観点からＳ
ｉＣウィスカーの代わりにＳｉＣ粒子を用いたＡｌ2 Ｏ
3 −ＳｉＣ粒子系材料が好ましい。これに使用されるＳ
ｉＣ粒子は平均粒径０．２μｍ以上２μｍ以下であるこ
とが好ましい。また、ＳｉＣ粒子は好ましくは７体積％
以上４０体積％以下、残りＡｌ2 Ｏ3 からなるものであ
る。ＳｉＣ粒子は平均粒径０．３μｍ未満では混合過程
で分散が不十分になり、２μｍ以上では材料の強度を低
下させ、当該粒子系材料自体の強度や切れ刃部の接合強
度が低くなるので、いずれも好ましくない。ＳｉＣ粒子
の体積％は、Ａｌ2 Ｏ3 −ＳｉＣウィスカー系材料の熱
膨張係数にあわせるよう設定するものとする。As a result of examining various kinds of materials to be applied to portions other than the cutting edge portion, an Al 2 O 3 material should be applied in consideration of the consistency with the cutting edge portion so that the bulk strength does not decrease. And The applied Al 2 O 3 material may be Al 2 O 3 or Al 2 O 3 —ZrO 2 , but from the viewpoint of having the same thermal expansion coefficient as the cutting edge portion,
Al 2 O using SiC particles instead of iC whiskers
A 3- SiC particle-based material is preferred. S used for this
The iC particles preferably have an average particle size of 0.2 μm or more and 2 μm or less. Also, the SiC particles are preferably 7% by volume.
At least 40% by volume, with the balance being Al 2 O 3 . When the average particle size of the SiC particles is less than 0.3 μm, the dispersion is insufficient in the mixing process, and when the average particle size is 2 μm or more, the strength of the material is reduced, and the strength of the particle-based material itself and the joining strength of the cutting edge are reduced. Neither is preferred. The volume percentage of the SiC particles is set to match the coefficient of thermal expansion of the Al 2 O 3 —SiC whisker-based material.
【００１１】また切れ刃部分も切れ刃以外の部分におい
てもマトリックスを構成するＡｌ2Ｏ3 は、ＺｒＯ2 や
ＴｉＣで強化することもできる。その時、添加する強化
相は体積率１５％以下とする。体積率１５％を越えると
相対的にＡｌ2 Ｏ3 の量が不して耐摩耗性が低下し、好
ましくない。The Al 2 O 3 constituting the matrix in both the cutting edge portion and the portion other than the cutting edge can be reinforced by ZrO 2 or TiC. At that time, the volume ratio of the strengthening phase to be added is 15% or less. If the volume ratio exceeds 15%, the amount of Al 2 O 3 is relatively small and the wear resistance is lowered, which is not preferable.
【００１２】なお、本発明の切削工具の製造法として
は、Ａｌ2 Ｏ3 −ＳｉＣウィスカー系材料の混合粉末
と、Ａｌ2 Ｏ3 系材料の混合粉末を黒鉛ダイス中に積層
充填しホットプレスすることが好ましい。またＡｌ2 Ｏ
3 −ＳｉＣウィスカー系材料の混合粉末と、Ａｌ2 Ｏ3
系材料の混合粉末を前もって予備成形し、それらを黒鉛
ダイス中にセットしホットプレスしてもよい。ホットプ
レスする場合の焼結温度は、１４００℃未満では緻密化
が不十分であり１８５０℃より高いとＡｌ2 Ｏ3 が粒成
長してしまい、耐摩耗性が低下し好ましくない。また、
５時間より長く焼結するとやはりＡｌ2 Ｏ3 が粒成長し
てしまい、耐摩耗性が低下し好ましくなく、１０分未満
では緻密化が不十分でありこれも好ましくない。圧力は
１５０ｋｇ／ｃｍ2 未満では緻密化不十分で好ましくな
く、５００ｋｇ／ｃｍ2 よりも高圧力では、効果に差が
なく工業的に意味がない。As a method of manufacturing the cutting tool of the present invention, a mixed powder of an Al 2 O 3 -SiC whisker-based material and a mixed powder of an Al 2 O 3 -based material are stacked and filled in a graphite die and hot-pressed. Is preferred. Al 2 O
Mixed powder of a 3- SiC whisker-based material and Al 2 O 3
The mixed powder of the system material may be preformed in advance, and they may be set in a graphite die and hot pressed. If the sintering temperature in the hot pressing is less than 1400 ° C., the densification is insufficient, and if it is higher than 1850 ° C., Al 2 O 3 grains grow and the wear resistance is undesirably reduced. Also,
If the sintering is performed for more than 5 hours, the grain growth of Al 2 O 3 will again occur, and the abrasion resistance will decrease, which is not preferable. If the sintering is less than 10 minutes, the densification is insufficient, which is also not preferable. If the pressure is less than 150 kg / cm 2 , the densification is insufficient, which is not preferable. If the pressure is higher than 500 kg / cm 2 , there is no difference in the effect and there is no industrial significance.
【００１３】本発明においてセラミックス切削工具の焼
結を促進するために、ＭｇＯ、Ｙ2Ｏ3 、ＮｉＯ、など
のＡｌ2 Ｏ3 系セラミックスの焼結助剤として既知の焼
結助剤を添加しても良いことはいうまでもない。In the present invention, in order to promote sintering of a ceramic cutting tool, a known sintering aid is added as a sintering aid for Al 2 O 3 ceramics such as MgO, Y 2 O 3 , NiO. Needless to say, this is acceptable.
【００１４】[0014]
【作用】上述したように、本発明のＡｌ2 Ｏ3 −ＳｉＣ
ウィスカー系切削工具は、高価なＳｉＣウィスカーの使
用を切削工具の切れ刃部分に限定するとともに、切れ刃
部以外の部分をＡｌ2 Ｏ3 粒子系材料で構成した。な
お、後述の実施例から分かるように、切れ刃以外の部分
も切削性能に影響するので、切削性能を全体がＳｉＣウ
ィスカーで強化された切削工具に遜色がないものとする
ためには、切れ刃以外の部分の材料の選択が重要にな
る。As described above, the Al 2 O 3 —SiC of the present invention is used.
The whisker-based cutting tool limited the use of expensive SiC whiskers to the cutting edge portion of the cutting tool, and constituted a portion other than the cutting edge portion from an Al 2 O 3 particle material. As can be seen from the examples described later, since parts other than the cutting edge also affect the cutting performance, in order to ensure that the cutting performance is comparable to that of a cutting tool reinforced entirely with SiC whiskers, the cutting edge is required. It is important to select the material for the other parts.
【００１５】[0015]
【発明の実施の形態】本発明を以下の実施例によりさら
に詳細に説明する。 実施の形態１．平均粒径１μｍ以下のα−Ａｌ2 Ｏ3 が
７５体積％、及び平均直径０．６μｍ、平均長さ２０μ
ｍのＳｉＣウィスカーが２５体積％になるように配合し
た混合粉（Ｉｗ）と、同じくＳｉＣウィスカーの代わり
に平均粒径０．５μｍのα−ＳｉＣ粒子を配合した混合
粉（Ｉｐ）をそれぞれボールミルで湿式混合して十分均
一に分散させた後、乾燥させた。これらの混合粉を黒鉛
ダイス中に、混合粉（Ｉｗ）／混合粉（Ｉｐ）／混合粉
（Ｉｗ）のように層状に充填し、１８００℃、４５０ｋ
ｇ／ｃｍ2 、Ａｒ気流中で１時間加圧焼結した。得られ
た焼結体から、形番ＳＮＧＮ１２０７０８の切削チップ
を切り出し研削加工した。Ａｌ2 Ｏ3 −ＳｉＣウィスカ
ー系材料の切れ刃部の厚さは３．２ｍｍであった。この
切削チップをＡとし、比較のために全てを混合粉（Ｉ
ｗ）でチップＡと同様にして作った切削チップをＢと
し、以下の条件で切削試験を行った。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the following examples. Embodiment 1 FIG. 75% by volume of α-Al 2 O 3 having an average particle diameter of 1 μm or less, an average diameter of 0.6 μm, and an average length of 20 μm
A mixed powder (Iw) containing 25% by volume of SiC whiskers and a mixed powder (Ip) containing α-SiC particles having an average particle size of 0.5 μm instead of the SiC whiskers were respectively ball milled. After being sufficiently uniformly dispersed by wet mixing, it was dried. These mixed powders are filled in a graphite die in a layered manner as mixed powder (Iw) / mixed powder (Ip) / mixed powder (Iw), at 1800 ° C. and 450 k
Pressure sintering was performed for 1 hour in an Ar gas flow at g / cm 2 . From the obtained sintered body, a cutting chip of model number SNGN120708 was cut out and ground. The thickness of the cutting edge portion of the Al 2 O 3 -SiC whisker material was 3.2 mm. This cutting tip was designated as A, and all of the mixed powder (I
The cutting insert made in the same manner as the insert A in w) was designated as B, and a cutting test was performed under the following conditions.
【００１６】 切削条件１ 被削材 インコネル７１８（溶体化処理後時効） 切削速度 １００ｍ／ｍｉｎ 送り ０．１５ｍｍ／ｒｅｖ 切り込み ２ｍｍ ホルダー ＦＮ１１Ｒ−４４Ａ 切削剤 使用せずCutting conditions 1 Work material Inconel 718 (aging after solution treatment) Cutting speed 100 m / min Feed 0.15 mm / rev Cutting depth 2 mm Holder FN11R-44A Cutting agent Not used
【００１７】この結果、１分間切削して、切削チップＡ
は逃げ面摩耗幅（Ｖａ）が０．１６ｍｍ、境界摩耗（Ｖ
ｎ）が０．３２ｍｍ、切削チップＢはＶａが０．１３ｍ
ｍ、Ｖｎが０．３４ｍｍでほぼ同等の評価結果であっ
た。As a result, the cutting tip A was cut for one minute.
Has a flank wear width (Va) of 0.16 mm and a boundary wear (V
n) is 0.32 mm, Va of the cutting tip B is 0.13 m
m and Vn were 0.34 mm, which were almost the same evaluation results.
【００１８】同様に以下の条件にてさらに切削試験を行
った。 切削条件２ 被削材 ＦＣＤ６０ 切削速度 ３００ｍ／ｍｉｎ 送り ０．１ｍｍ／刃 切り込み １．５ｍｍ カッター ＣＳＢＲＮ２５２５（１５０φ、一枚刃に
て試験を行った） 切削剤 使用せず この結果、２５０ｍｍを３パス切削した時の逃げ面摩耗
幅は、切削チップＡが０．２７ｍｍ、切削チップＢが
０．３０ｍｍでほぼ同等の評価結果であった。Similarly, a cutting test was further performed under the following conditions. Cutting condition 2 Work material FCD60 Cutting speed 300m / min Feeding 0.1mm / tooth Cutting depth 1.5mm Cutter CSBRN2525 (tested with 150φ, single blade) No cutting agent used As a result, 250mm 3 pass cutting The flank wear width at the time of cutting was 0.27 mm for the cutting tip A and 0.30 mm for the cutting tip B, which were almost the same evaluation results.
【００１９】実施の形態２．平均粒径１μｍ以下のα−
Ａｌ2 Ｏ3 が６３体積％、及び平均直径０．６μｍ、平
均長さ２０μｍのＳｉＣウィスカーが３２体積％、イッ
トリア３モル％含有した平均粒径０．４μｍのジルコニ
アが５体積％になるように配合した混合粉（ＩＩｗ）
と、同じくＳｉＣウィスカーの代わりに平均粒径０．５
μｍのα−ＳｉＣ粒子を配合した混合粉（ＩＩｐ）をそ
れぞれボールミルで湿式混合して十分均一に分散させた
後、乾燥させた。これらの混合粉を黒鉛ダイス中に、混
合粉（ＩＩｐ）／混合粉（ＩＩｗ）のように層状に充填
し、１６００℃、４５０ｋｇ／ｃｍ2 、Ａｒ気流中で１
時間加圧焼結した。得られた焼結体から、形番ＲＣＧＸ
１２０７００の切削チップを作製しチップＣとし、実施
の形態１の切削条件１にて切削時間１分間の切削試験を
行った結果、Ｖａが０．１２ｍｍ、Ｖｎが０．２４ｍｍ
であり、良好な結果であった。Embodiment 2 Α- having an average particle size of 1 μm or less
63 volume% of Al 2 O 3, 32 volume% of SiC whiskers having an average diameter of 0.6 μm and an average length of 20 μm, and 5 volume% of zirconia having an average particle diameter of 0.4 μm containing 3 mol% of yttria. Mixed powder (IIw)
And the average particle size is 0.5 instead of the SiC whisker.
The mixed powder (IIp) containing the α-SiC particles of μm was wet-mixed with a ball mill and dispersed sufficiently uniformly, and then dried. These mixed powders were filled into graphite dies in a layered manner as mixed powder (IIp) / mixed powder (IIw), and 1600 ° C., 450 kg / cm 2 , and 1 kg in an Ar gas flow.
Pressure sintering was performed for hours. From the obtained sintered body, model number RCGX
As a result of performing a cutting test for a cutting time of 1 minute under a cutting condition 1 of the first embodiment under the cutting condition 1 of Embodiment 1, Va was 0.12 mm and Vn was 0.24 mm.
, Which was a good result.
【００２０】実施の形態３．実施の形態２で得た混合粉
（ＩＩｗ）の組成を、ジルコニアを含まない構成、即
ち、平均粒径１μｍ以下のα−Ａｌ2 Ｏ3 が６８体積
％、及び平均直径０．６μｍ、平均長さ２０μｍのＳｉ
Ｃウィスカーが３２体積％になるように配合した混合粉
（ＩＩＩｗ）とし、それ以外は実施の形態２と同様にチ
ップＤを作製した。実施の形態１の切削条件１にて切削
時間１分間の切削試験を行った結果、Ｖａが０．１２ｍ
ｍ、Ｖｎが０．３２ｍｍであり、良好であった。Embodiment 3 The composition of the mixed powder (IIw) obtained in the second embodiment has a composition not containing zirconia, that is, 68% by volume of α-Al 2 O 3 having an average particle size of 1 μm or less, an average diameter of 0.6 μm, and an average length. 20 μm Si
A chip D was prepared in the same manner as in the second embodiment except that the mixed powder (IIIw) was blended so that the C whiskers were 32% by volume. As a result of performing a cutting test for a cutting time of 1 minute under the cutting condition 1 of Embodiment 1, Va was 0.12 m.
m and Vn were 0.32 mm, which was good.
【００２１】実施の形態４．実施の形態１で得た切削チ
ップＡと同一組成のセラミックス切削工具で、ブレーキ
ディスクの外径を以下の条件にて１００個旋削した。比
較のために市販のＳｉ3 Ｎ4 切削工具（チップＥ）を用
いて同一条件で試験した。Embodiment 4 FIG. With a ceramic cutting tool having the same composition as the cutting tip A obtained in Embodiment 1, 100 outer diameters of the brake disk were turned under the following conditions. For comparison, a test was performed under the same conditions using a commercially available Si 3 N 4 cutting tool (tip E).
【００２２】 切削条件 被削材 ＦＣ２５ 切削速度 ８００ｍ／ｍｉｎ 送り ０．５ｍｍ／ｒｅｖ 切り込み ２ｍｍ 切削剤 使用 カッター ＣＳＢＲＮ２５２ この結果、切削チップＡはＶａが０．１９ｍｍ、Ｖｎが
０．５ｍｍ、切削チップＥは、Ｖａが０．４６ｍｍ、Ｖ
ｎが０．４２ｍｍで逃げ面摩耗幅の観点では約２倍以上
の寿命の可能性を示した。Cutting conditions Work material FC25 Cutting speed 800 m / min Feed 0.5 mm / rev Cutting depth 2 mm Cutting agent used Cutter CSBRN252 As a result, the cutting tip A has a Va of 0.19 mm, Vn of 0.5 mm, and the cutting tip E has a , Va is 0.46 mm, V
When n was 0.42 mm, the life was about twice as long in terms of the flank wear width.
【００２３】実施の形態５．平均粒径１μｍ以下のα−
Ａｌ2 Ｏ3 と、そのα−Ａｌ2 Ｏ3 が９０体積％、及び
平均直径０．６μｍ、平均長さ２０μｍのＳｉＣウィス
カーが１０体積％になるように配合した混合粉ＩＶｗと
を用意した。これらを黒鉛ダイス中に、混合粉ＩＶｗ／
Ａｌ2 Ｏ3 ／混合粉ＩＶｗのように層状に充填し、１７
００℃、３００ｋｇ／ｃｍ2 、Ａｒ気流中で１時間加圧
焼結した。得られた焼結体から、形番ＳＮＧＮ１２０４
０８の切削チップを切り出し研削加工した。このチップ
をＦとし、実施の形態４と同じ被削材（ブレーキディス
ク）と切削条件で被削材の外径を１００個旋削した。そ
の結果、Ｖａが０．１５ｍｍ、Ｖｎが０．５６ｍｍで良
好な寿命の可能性を示した。Embodiment 5 Α- having an average particle size of 1 μm or less
Al 2 O 3 and a mixed powder IVw prepared by mixing 90% by volume of α-Al 2 O 3 and 10% by volume of SiC whiskers having an average diameter of 0.6 μm and an average length of 20 μm were prepared. These are mixed in a graphite die and mixed powder IVw /
Al 2 O 3 / mixed powder IVw, packed in layers,
Pressure sintering was performed at 00 ° C., 300 kg / cm 2 for 1 hour in an Ar gas flow. From the obtained sintered body, model number SNGN1204
08 cutting chips were cut out and ground. This tip was designated as F, and 100 outer diameters of the work material were turned under the same work material (brake disc) and cutting conditions as in the fourth embodiment. As a result, when Va was 0.15 mm and Vn was 0.56 mm, the possibility of good life was shown.
【００２４】比較例 実施形態１の切削チップＡの混合粉（Ｉｐ）の代わりに
Ｓｉ3 Ｎ4 粒子を使用し、切削条件１における切削試験
では２０秒切削したところで切れ刃部との界面から大き
く破損し、著しく劣る評価結果となった。Comparative Example Si 3 N 4 particles were used in place of the mixed powder (Ip) of the cutting tip A of the first embodiment. In the cutting test under the cutting condition 1, after cutting for 20 seconds, the distance from the interface with the cutting edge increased greatly. It was damaged, resulting in a remarkably poor evaluation result.
【００２５】[0025]
【発明の効果】以上説明したように、本発明で得たセラ
ミックス切削工具は、ＳｉＣウィスカーの使用を切削工
具の切れ刃の部分に限定させてできるだけ原料コストを
抑え、安価な価格のＡｌ2 Ｏ3 −ＳｉＣウィスカー系切
削工具を提供できるため、ねずみ鋳鉄やダクタイル鋳鉄
等の鉄系被削材の切削に十分なコスト／パーフォーマン
スを与え、金属切削業界において幅広く貢献する可能性
を持つ。As described above, in the ceramic cutting tool obtained by the present invention, the use of SiC whiskers is limited to the cutting edge portion of the cutting tool, the raw material cost is suppressed as much as possible, and the inexpensive Al 2 O Since 3- SiC whisker-based cutting tools can be provided, sufficient cost / performance can be provided for cutting iron-based work materials such as gray cast iron and ductile cast iron, and there is a possibility of contributing widely to the metal cutting industry.
【図１】ネガティヴタイプの切削工具の斜視図である。FIG. 1 is a perspective view of a negative type cutting tool.
【図２】ポジティヴタイプの切削工具の斜視図である。FIG. 2 is a perspective view of a positive type cutting tool.
Claims (6)
具において、厚さ２ｍｍ以上４ｍｍ以下の切れ刃部をＡ
ｌ2 Ｏ3 −ＳｉＣウィスカー系材料で構成し、それ以外
をＡｌ2 Ｏ3 系粒子材料で構成したことを特徴とするセ
ラミックス切削工具。1. An Al 2 O 3 —SiC whisker-based cutting tool, wherein a cutting edge portion having a thickness of 2 mm or more and 4 mm or less is formed by A
l 2 O 3 constituted by -SiC whisker materials, ceramics cutting tool, characterized in that the rest is constituted by Al 2 O 3 based particulate material.
−ＳｉＣ系で構成した請求項１記載のセラミックス切削
工具。2. The method according to claim 1, wherein the Al 2 O 3 -based particle material is Al 2 O 3
The ceramic cutting tool according to claim 1, wherein the ceramic cutting tool is made of -SiC.
径０．３μｍ以上１μｍ以下でかつ平均長さ２μｍ以上
５０μｍ以下であり、さらに前記ＳｉＣウィスカーが切
れ刃部に対して体積率７％以上４０％以下である請求項
１又は２記載のセラミックス切削工具。3. The size of the SiC whiskers is 0.3 μm or more and 1 μm or less in average diameter and 2 μm or more and 50 μm or less in average length, and the volume ratio of the SiC whiskers to the cutting edge is 7% or more and 40% or less. The ceramic cutting tool according to claim 1 or 2, wherein:
粒子が、平均粒径０．２μｍ以上２μｍ以下であり、か
つＳｉＣ粒子の体積率が該Ａｌ2 Ｏ3 −ＳｉＣ粒子系材
料に対して７％以上４０％以下である請求項２記載のセ
ラミックス切削工具。Wherein the particles of the Al 2 O 3 -SiC particles based material, or less average grain size 0.2μm or 2 [mu] m, and volume fraction of SiC particles in said Al 2 O 3 -SiC particles based material 3. The ceramic cutting tool according to claim 2, wherein the content is 7% or more and 40% or less.
び／あるいはＡｌ2Ｏ3 −ＳｉＣ粒子系材料のマトリッ
クスを構成するＡｌ2 Ｏ3 が体積率１５％以下のＺｒＯ
2 及び／あるいはＴｉＣで強化された請求項２記載のセ
ラミックス切削工具。5. The Al 2 O 3 -SiC whisker material and / or Al 2 O 3 -SiC particles based Al 2 O 3 is less by volume ratio 15% ZrO constituting the matrix material
The ceramic cutting tool according to claim 2, reinforced with 2 and / or TiC.
混合粉とＡｌ2 Ｏ3−ＳｉＣ粒子系材料の混合粉を黒鉛
ダイス内に積層し、１４００℃以上１８５０℃以下にて
１０分以上５時間以下にて１５０ｋｇ／ｃｍ2 以上５０
０ｋｇ／ｃｍ2 以下の圧力下で加圧焼結することを特徴
とするセラミックス切削工具の製造方法。6. A mixed powder of an Al 2 O 3 —SiC whisker-based material and a mixed powder of an Al 2 O 3 —SiC particle-based material are laminated in a graphite die, and at a temperature of 1400 ° C. to 1850 ° C. for 10 minutes to 5 minutes. 150 kg / cm 2 or more for 50 hours or less
A method for producing a ceramic cutting tool, comprising performing pressure sintering under a pressure of 0 kg / cm 2 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9168582A JPH1110409A (en) | 1997-06-25 | 1997-06-25 | Ceramics cutting tool and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9168582A JPH1110409A (en) | 1997-06-25 | 1997-06-25 | Ceramics cutting tool and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1110409A true JPH1110409A (en) | 1999-01-19 |
Family
ID=15870737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9168582A Pending JPH1110409A (en) | 1997-06-25 | 1997-06-25 | Ceramics cutting tool and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1110409A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010010648A1 (en) * | 2008-07-22 | 2010-01-28 | 日本特殊陶業株式会社 | Cutting insert and cutting tool |
| JP2010521324A (en) * | 2007-03-16 | 2010-06-24 | ティーディーワイ・インダストリーズ・インコーポレーテッド | Composite materials |
| US8841005B2 (en) | 2006-10-25 | 2014-09-23 | Kennametal Inc. | Articles having improved resistance to thermal cracking |
| US9016406B2 (en) | 2011-09-22 | 2015-04-28 | Kennametal Inc. | Cutting inserts for earth-boring bits |
| US9266171B2 (en) | 2009-07-14 | 2016-02-23 | Kennametal Inc. | Grinding roll including wear resistant working surface |
| US9643236B2 (en) | 2009-11-11 | 2017-05-09 | Landis Solutions Llc | Thread rolling die and method of making same |
-
1997
- 1997-06-25 JP JP9168582A patent/JPH1110409A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8841005B2 (en) | 2006-10-25 | 2014-09-23 | Kennametal Inc. | Articles having improved resistance to thermal cracking |
| JP2010521324A (en) * | 2007-03-16 | 2010-06-24 | ティーディーワイ・インダストリーズ・インコーポレーテッド | Composite materials |
| WO2010010648A1 (en) * | 2008-07-22 | 2010-01-28 | 日本特殊陶業株式会社 | Cutting insert and cutting tool |
| CN102105248A (en) * | 2008-07-22 | 2011-06-22 | 日本特殊陶业株式会社 | Cutting insert and cutting tool |
| JPWO2010010648A1 (en) * | 2008-07-22 | 2012-01-05 | 日本特殊陶業株式会社 | Cutting insert and cutting tool |
| US9266171B2 (en) | 2009-07-14 | 2016-02-23 | Kennametal Inc. | Grinding roll including wear resistant working surface |
| US9643236B2 (en) | 2009-11-11 | 2017-05-09 | Landis Solutions Llc | Thread rolling die and method of making same |
| US9016406B2 (en) | 2011-09-22 | 2015-04-28 | Kennametal Inc. | Cutting inserts for earth-boring bits |
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