JPH0777688B2 - Cermet drill with excellent fracture resistance - Google Patents
Cermet drill with excellent fracture resistanceInfo
- Publication number
- JPH0777688B2 JPH0777688B2 JP61133060A JP13306086A JPH0777688B2 JP H0777688 B2 JPH0777688 B2 JP H0777688B2 JP 61133060 A JP61133060 A JP 61133060A JP 13306086 A JP13306086 A JP 13306086A JP H0777688 B2 JPH0777688 B2 JP H0777688B2
- Authority
- JP
- Japan
- Prior art keywords
- cermet
- hardness
- drill
- drills
- average particle
- 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 - Fee Related
Links
Landscapes
- Drilling Tools (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、すぐれた耐欠損性を有し、かつ耐摩耗性お
よび耐溶着性にすぐれ、特に高送り切削でも高い仕上面
精度が得られ、かつきわめて長い使用寿命を示すサーメ
ット製ドリルに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has excellent fracture resistance, excellent wear resistance and welding resistance, and in particular, high surface finish accuracy can be obtained even in high feed cutting. And a cermet drill that has an extremely long service life.
従来、一般に、ドリルとしては、例えば第1図に先端面
図(a)および正面図(b)で示されるソリッドドリル
などが知られており、これらのドリルは、高速度鋼や炭
化タングステン(以下WCで示す)基超硬合金なとで製造
されている。Conventionally, as a drill, generally, for example, a solid drill shown in a front view (a) and a front view (b) in FIG. 1 is known, and these drills are made of high-speed steel or tungsten carbide (hereinafter Manufactured from base cemented carbide.
しかし、これらのドリルを、例えば高送り切削に用いた
場合、高速度鋼製ドリルは、耐摩耗性不足が原因で、き
わめて短かい使用寿命しか示さず、またWC基超硬合金製
ドリルは、十分な耐摩耗性をもつものの、被削材との耐
溶着性に問題があるために、比較的短時間で仕上面精度
が低下し、短かい使用寿命しか示さない。However, when these drills are used for high-feed cutting, for example, high-speed steel drills show only a very short service life due to lack of wear resistance, and WC-based cemented carbide drills Although it has sufficient wear resistance, it has a problem with the welding resistance to the work material, so that the accuracy of the finished surface deteriorates in a relatively short time and only a short service life is exhibited.
そこで、本発明者等は、上述のような観点から、特に高
送り切削でもすぐれた切削性能を長期に亘って発揮する
ドリルを開発すべく研究を行なった結果、ドリルを、重
量%で(以下、%は重量%を示す)、 硬質分散相形成成分としてW,Mo,Ta、およびNbの炭化物
(以下、それぞれWC,Mo2C,TaC、およびNbCで示す)のう
ちの1種以上:8〜20%、 結合相形成成分としてCoおよび/またはNi:20〜26%、 硬質分散相形成成分としてTiの炭化物との窒化物、また
は炭窒化ケタン(以下、それぞれTiC、TiN,TiCNで示
す):残り、 からなる組成、並びに、 硬さ:ロックウェル硬さAスケール(HRA)で88〜91未
満、 硬質分散相の平均粒径:0.5〜1μm、 を有するサーメットで構成すると、このサーメットは、
通常のサーメットのもつ硬さ:HRA91.5以上および硬質分
散相の平均粒径:2μm以上に比して、相対的に低い硬さ
をもち、かつ細かい硬質分散相で構成されていることか
ら、この結果のサーメット製ドリルは、これを高送り切
削に用いても欠損が発生することなく、すぐれた耐摩耗
性と耐溶着性を示し、高い仕上面積精度を著しく長期に
亘って発揮するという研究結果を得たのである。Therefore, from the viewpoints described above, the inventors of the present invention have conducted research to develop a drill that exhibits excellent cutting performance even in high-feed cutting over a long period of time. ,% Represents weight%), and one or more of carbides of W, Mo, Ta, and Nb (hereinafter, respectively represented by WC, Mo 2 C, TaC, and NbC) as a hard dispersed phase forming component: 8 ~ 20%, Co and / or Ni as binder phase forming component: 20 to 26%, Nitride with carbide of Ti as hard disperse phase forming component, or carbonitride ketane (hereinafter referred to as TiC, TiN, TiCN) : rest, a composition, as well as the hardness: Rockwell hardness a scale (H R a) is less than 88 to 91, an average particle diameter of the hard dispersion phase: 0.5 to 1 [mu] m, when a cermet comprising having, this cermet Is
Hardness of ordinary cermet: H R A 91.5 or more and average particle size of hard dispersed phase: 2 μm or more, relatively low hardness and composed of fine hard dispersed phase Therefore, the cermet drill of this result shows excellent wear resistance and welding resistance without causing defects even when it is used for high feed cutting, and exerts a high finished area accuracy for a remarkably long time. That is the result of the research.
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、以下に配合組成、硬さ、および硬質分散相の平
均粒径を上記の通りに限定した理由を説明する。The present invention was made based on the above-mentioned research results, and the reasons why the compounding composition, hardness, and average particle diameter of the hard dispersed phase are limited as described above will be described below.
(1) 配合組成 WC,Mo2C,TaC、およびNbCは、いずれも焼結時にTiCとTi
N、またはTiCNと反応して硬質分散相としての複合炭窒
化物、すなわち組成式で示せば、(Ti,M)CN(ただし、
Mは、W,Mo,Ta、およびNbのうちの1種以上)を形成
し、硬質分散相の耐熱衝撃性を向上させ、もってクラッ
クの発生を抑制し、このクラックが原因のチッピングの
発生を防止する作用をもつが、その割合が8%未満では
所望のすぐれた耐熱衝撃性を有する硬質分散相を形成す
ることができず、一方その割合が20%を越えると硬質分
散相の硬さが低下するようになることから、その割合を
8〜20%と定めた。(1) The composition of WC, Mo 2 C, TaC, and NbC are all TiC and Ti during sintering.
Compound carbonitride as a hard dispersed phase by reacting with N, or TiCN, that is, (Ti, M) CN (however,
M forms one or more of W, Mo, Ta, and Nb), improves the thermal shock resistance of the hard dispersed phase, and thus suppresses the occurrence of cracks, and prevents the occurrence of chipping due to these cracks. Although it has a function of preventing, if the proportion is less than 8%, a hard dispersed phase having desired excellent thermal shock resistance cannot be formed, while if the proportion exceeds 20%, the hardness of the hard dispersed phase becomes high. Since it will decrease, the ratio is set to 8 to 20%.
また、CoおよびNiには、焼結性を向上させ、かつ結合相
を形成して強度を向上させる作用があるが、その割合が
20%未満では所望の強度向上効果が得られず、かつ硬さ
かがHRA91以上になってしまい、この結果欠損が発生し
易くなり、一方その割合が26%を越えるとHRAで88以上
の硬さを確保することができず、耐摩耗性が低下するよ
うになることから、その割合を20〜26%と定めた。Further, Co and Ni have the effects of improving the sinterability and forming the binder phase to improve the strength, but their proportion is
If it is less than 20%, the desired strength-improving effect cannot be obtained, and the hardness becomes H R A91 or higher, and as a result, defects tend to occur, while if the ratio exceeds 26%, H R A becomes 88. Since the above hardness cannot be ensured and the wear resistance is deteriorated, the ratio is set to 20 to 26%.
(2) 硬さ 硬さがHRA88未満では所望の耐摩耗性を確保することが
できず、一方硬さがHRA91以上になると耐欠損性に低下
傾向が現われるようになることから、硬さをHRA88〜91
未満と定めた。(2) Hardness If the hardness is less than H R A88, the desired wear resistance cannot be secured, while if the hardness is more than H R A91, the fracture resistance tends to decrease. Hardness H R A88 ~ 91
Specified as less than.
(3) 硬質分散相の平均粒径 その平均粒径が0.5μm未満のサーメットは、現在の技
術では製造が困難であり、一方その平均粒径が1μmを
越えると、耐熱衝撃性に低下傾向が現われ、クラックが
発生し易くなり、このクラックが原因でチッピングが発
生し、摩耗が促進されるようになることから、その平均
粒径を0.5〜1μmと定めた。(3) Average particle size of hard dispersed phase Cermet having an average particle size of less than 0.5 μm is difficult to manufacture by the current technology, while if the average particle size exceeds 1 μm, thermal shock resistance tends to decrease. Appearing, cracks are likely to occur, chipping occurs due to the cracks, and wear is promoted. Therefore, the average particle size is set to 0.5 to 1 μm.
つぎに、この発明のサーメット製ドリルを実施例により
具体的に説明する。Next, the cermet drill of the present invention will be specifically described with reference to Examples.
原料粉末として、いずれも0.5〜1.7μmの範囲内の所定
の平均粒径を有するTiC粉末、Tin粉末、TiCN粉末、WC粉
末、Mo2C粉末、TaC粉末、およびNbC粉末、並びにいずれ
も1.5μmの平均粒径を有するCo粉末およびNi粉末を用
意し、これら原料粉末をそれぞれ第1,2表に示される配
合組成に配合し、通常の条件で混合し、プレス成形し、
焼結して外径:11.5mm×長さ:95mmの寸法をもったサーメ
ット素材を形成し、このサーメット素材から外径:10.5m
m×長さ:89mmの寸法に研磨仕上げすることによってソリ
ッドドリルとしての本発明サーメット製ドリル(以下、
本発明ドリルという)1〜9および比較サーメ ット製ドリル(以下、比較ドリルという)1〜7をそれ
ぞれ製造した。As raw material powders, TiC powder, Tin powder, TiCN powder, WC powder, Mo 2 C powder, TaC powder, and NbC powder, each having a predetermined average particle size within the range of 0.5 to 1.7 μm, and all 1.5 μm Prepare Co powder and Ni powder having an average particle size of, and mix these raw material powders with the compounding compositions shown in Tables 1 and 2, respectively, mix under normal conditions, press-mold,
Sintered to form a cermet material with dimensions of outer diameter: 11.5 mm x length: 95 mm, and from this cermet material, outer diameter: 10.5 m
m × length: The cermet-made drill of the present invention as a solid drill by polishing to a dimension of 89 mm (hereinafter,
Inventive drill) 1-9 and comparative shark TT drills (hereinafter, referred to as comparative drills) 1 to 7 were manufactured.
なお、比較ドリル1〜7は、いずれも配合組成、硬さ、
および硬質分散相の平均粒径のうちのいずれか(第2,3
表に※印を付す)がこの発明の範囲から外れたものであ
る。In addition, all the comparative drills 1 to 7 have a blended composition, hardness,
And one of the average particle sizes of the hard dispersed phase (second, third
(Marked with * in the table) is outside the scope of this invention.
また、比較の目的で、高速度鋼(JIS・SKH−55)製ドリ
ル、およびWC基超硬合金製ドリルを従来ドリル1,2とし
て用意した。For comparison purposes, high-speed steel (JIS SKH-55) drills and WC-based cemented carbide drills were prepared as conventional drills 1 and 2.
ついで、この結果得られた本発明ドリル1〜9、比較ド
リル1〜7、および従来ドリル1,2について、これを構
成するサーメットの硬質分散相の平均粒径、並びに硬さ
を測定すると共に、 被削材の材質:炭素鋼(S45C、硬さ:HB160)、 被削材の形状:厚さ15mmの板材、 切削速度:60m/min、 送り:0.2m/rev.、 形式:湿式、 の条件で鋼板材の高送り穴あけ切削試験を行ない、3500
の穴あけ加工後のドリルの正面刃とマージン部における
摩耗深さを測定した。これらの測定経過を第3表に示し
た。Then, for the drills 1 to 9 of the present invention, the comparative drills 1 to 7, and the conventional drills 1 and 2 obtained as a result, while measuring the average particle size of the hard dispersed phase of the cermet constituting the drills, and the hardness, material of workpiece: carbon steel (S45C, hardness: H B 160), the workpiece shape: plate thickness 15 mm, cutting speed: 60 m / min, feed: 0.2 m / rev, format:. wet, High feed piercing cutting test of steel plate material under the condition of 3500
The wear depth of the front edge of the drill and the margin after the drilling was measured. Table 3 shows the progress of these measurements.
第1〜3表に示される結果から、本発明ドリル1〜9
は、いずれも従来ドリル1,2に比してすぐれた切削性能
を著しく長期に亘って発揮することが明らかである。From the results shown in Tables 1 to 3, the present drills 1 to 9
It is clear that each of them has excellent cutting performance over the conventional drills 1 and 2 over a long period of time.
一方、比較ドリル1〜7に見られるように、配合組成、
硬さ、および硬質分散相の平均粒径のうちのいずれかが
この発明の範囲から外れると所望の切削特性を示さない
ことが明らかである。On the other hand, as seen in comparative drills 1 to 7,
It is clear that if either the hardness or the average particle size of the hard dispersed phase deviates from the scope of the present invention, the desired cutting characteristics are not exhibited.
以上のように、この発明のサーメット製ドリルは、すぐ
れた耐欠損性を有し、かつ耐摩耗性および耐溶着性にも
すぐれたサーメットで構成されているので、高送り切削
でも高い仕上面精度を著しく長期に亘って発揮するなど
工業上有用な特性を有するのである。As described above, the cermet drill of the present invention has excellent fracture resistance, and is composed of a cermet that is also excellent in wear resistance and welding resistance, so that high surface finish accuracy is achieved even in high feed cutting. It has industrially useful properties such as exhibiting remarkably long term.
第1図(a)および(b)は、ドリルの1例としてのソ
リッドドリルの先端面図および正面図である。1A and 1B are a front view and a front view of a solid drill as an example of a drill.
Claims (1)
のうちの1種以上:8〜20%、 結合相形成成分としてCoおよび/またはNi:20〜26%、 硬質分散相形成成分としてTiの炭化物と窒化物、または
炭窒化物:残り、 からなる配合組成、並びに、 硬さ:ロックウェル硬さ(Aスケール)で88〜91未満、 硬質分散相の平均粒径:0.5〜1μm、 を有するサーメットで構成したことを特徴とする耐欠損
性のすぐれたサーメット製ドリル。1. At least 1% by weight of carbides of W, Mo, Ta and Nb as hard dispersed phase forming components: 8 to 20%, and Co and / or Ni: 20 to 20% as binder phase forming components. 26%, Ti carbide and nitride as hard disperse phase forming component, or carbonitride: balance, compounding composition, and hardness: Rockwell hardness (A scale) 88 to less than 91, hard disperse phase A cermet-made drill with excellent fracture resistance, which is characterized by comprising a cermet having an average particle diameter of 0.5 to 1 μm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61133060A JPH0777688B2 (en) | 1986-06-09 | 1986-06-09 | Cermet drill with excellent fracture resistance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61133060A JPH0777688B2 (en) | 1986-06-09 | 1986-06-09 | Cermet drill with excellent fracture resistance |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62292307A JPS62292307A (en) | 1987-12-19 |
JPH0777688B2 true JPH0777688B2 (en) | 1995-08-23 |
Family
ID=15095888
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61133060A Expired - Fee Related JPH0777688B2 (en) | 1986-06-09 | 1986-06-09 | Cermet drill with excellent fracture resistance |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0777688B2 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2623304B2 (en) * | 1988-07-27 | 1997-06-25 | 東芝タンガロイ株式会社 | Cermet twist drill |
JP2890592B2 (en) * | 1989-01-26 | 1999-05-17 | 住友電気工業株式会社 | Carbide alloy drill |
WO1991009698A1 (en) * | 1989-12-25 | 1991-07-11 | Sumitomo Electric Industries, Ltd. | Throw-away drill |
JPH03234408A (en) * | 1990-02-05 | 1991-10-18 | Sumitomo Electric Ind Ltd | Throw-away type drill |
EP0443517B1 (en) * | 1990-02-20 | 1995-09-06 | Sumitomo Electric Industries, Ltd. | Throw-away tipped drill |
US5137398A (en) * | 1990-04-27 | 1992-08-11 | Sumitomo Electric Industries, Ltd. | Drill bit having a diamond-coated sintered body |
JP2792391B2 (en) * | 1993-05-21 | 1998-09-03 | 株式会社神戸製鋼所 | Cermet sintered body |
JP2795210B2 (en) * | 1995-02-22 | 1998-09-10 | 住友電気工業株式会社 | Tough cermet drill |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59229431A (en) * | 1983-05-20 | 1984-12-22 | Mitsubishi Metal Corp | Production of cermet having high toughness for cutting tool |
-
1986
- 1986-06-09 JP JP61133060A patent/JPH0777688B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPS62292307A (en) | 1987-12-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |