JPH01156439A - Manufacture of tungsten carbide-base sintered hard alloy for cutting tool - Google Patents
Manufacture of tungsten carbide-base sintered hard alloy for cutting toolInfo
- Publication number
- JPH01156439A JPH01156439A JP62315730A JP31573087A JPH01156439A JP H01156439 A JPH01156439 A JP H01156439A JP 62315730 A JP62315730 A JP 62315730A JP 31573087 A JP31573087 A JP 31573087A JP H01156439 A JPH01156439 A JP H01156439A
- Authority
- JP
- Japan
- Prior art keywords
- hard alloy
- sintered hard
- base sintered
- temperature
- cemented carbide
- 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.)
- Granted
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 239000000956 alloy Substances 0.000 title abstract 6
- 229910045601 alloy Inorganic materials 0.000 title abstract 6
- 229910052721 tungsten Inorganic materials 0.000 title description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title 1
- 239000010937 tungsten Substances 0.000 title 1
- 238000005245 sintering Methods 0.000 claims abstract description 22
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims 2
- 229910052786 argon Inorganic materials 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 12
- 238000012733 comparative method Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 150000001247 metal acetylides Chemical class 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- -1 NbC Chemical class 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、特にすぐれた耐欠損性を有し、かつ耐摩耗
性にもすぐれ、切削工具として用いるのに適した炭化タ
ングステン（以下ＷＣで示す）超超硬合金の製造法に関
するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to tungsten carbide (hereinafter referred to as WC), which has particularly excellent fracture resistance and wear resistance, and is suitable for use as a cutting tool. This relates to a method of manufacturing cemented carbide.
一般に、ＷＣＣ超超硬合金切削工具として用いられ、こ
れが、所定の配合組成を有する圧粉体を１、−１
雰囲気 、 ｔｏ ｔｏｒｒ以下の真空雰囲気、あ
るいは１〜１０ｔｏｒｒの窒素減圧
雰囲気、
温 度 ： １４００〜１５００℃、昇温速
度 ： 約り００℃／ｈｒ以下、保持時間 ＝ １〜２
時間、
の条件で焼結することにより製造されていることも良く
知られるところである。Generally, it is used as a WCC cemented carbide cutting tool, and this is used to cut a green compact having a predetermined composition in a vacuum atmosphere of less than 10 torr, or a nitrogen reduced pressure atmosphere of 1 to 10 torr, and temperature: 1400-1500℃, heating rate: approx. 00℃/hr or less, holding time = 1-2
It is also well known that it is manufactured by sintering under conditions of .
しかし、上記の従来ＷＣＣ超超硬合金製造法においては
、焼結時に、これを構成するＷＣや、Ｔｉｃ、Ｔａｃ、
およびＮｂＣなどの炭化物、さらにＴ ｉ Ｎ、 Ｔ
ａ Ｎ、およびＮｂＮなどの窒化物に粒成長が起り、こ
れが原因で十分な耐欠損性を有するＷＣＣ超超硬合金得
られないのが現状である。However, in the conventional WCC cemented carbide production method described above, during sintering, the WC, Tic, Tac,
and carbides such as NbC, as well as T i N, T
At present, grain growth occurs in nitrides such as aN and NbN, and because of this, it is not possible to obtain a WCC cemented carbide having sufficient fracture resistance.
そこで、本発明者等は、上述のような観点から、耐欠損
性にすぐれたＷＣＣ超超硬合金製造すべく研究を行なっ
た結果、従来ＷＣＣ超超硬合金製造に際して適用されて
いる焼結条件のうち、特に雰囲気をＡ「とした状態で、
その圧力を高め、かつ焼結温度への昇温速度を一段と速
くすると共に、焼結温度での保持時間を短かくすると、
焼結時におけるＷＣや、各種の炭化物および窒化物など
の構成成分の粒成長が著しく抑制されるようになり、焼
結後のＷＣＣ超超硬合金、すぐれた耐摩耗性を保持した
状態で、すぐれた耐欠損性を具備するようになるという
知見を得たのである。Therefore, from the above-mentioned viewpoint, the present inventors conducted research to produce a WCC cemented carbide with excellent fracture resistance, and found that the sintering conditions conventionally applied to the production of WCC cemented carbide were Among them, especially when the atmosphere is set to A,
By increasing the pressure, increasing the rate of temperature rise to the sintering temperature, and shortening the holding time at the sintering temperature,
Grain growth of constituent components such as WC and various carbides and nitrides during sintering is significantly suppressed, and the WCC cemented carbide after sintering maintains excellent wear resistance. They found that it has excellent fracture resistance.
したがって、この発明は、上記知見にもとづいてなされ
たものであって、焼結条件を、雰囲気：Ａｒガス〜
雰囲気圧力 ： １〜２００気圧、
温 度 ： １３００〜１５００℃、昇温
速度 二３００℃／ｈｒ以上、
保持時間 ： １時間以下、
とした切削工具用ＷＣＣ超超硬合金製造法に特徴を有す
るものである。Therefore, this invention has been made based on the above findings, and the sintering conditions are as follows: atmosphere: Ar gas - atmospheric pressure: 1 to 200 atm; temperature: 1300 to 1500°C; temperature increase rate: 2300°C. /hr or more, holding time: 1 hour or less, This is a method for manufacturing a WCC cemented carbide for cutting tools.
つぎに、この発明の方法において、焼結条件を上記の通
りに限定した理由を説明する。Next, the reason why the sintering conditions are limited as described above in the method of the present invention will be explained.
（ａ） 雰囲気圧力
その圧力が１気圧未満では、昇温速度および保持時間と
の関係で、十分な焼結を行なうことができず、したがっ
て焼結後のＷＣＣ超超硬合金はボアが残存するようにな
って所望の耐欠損性を得るのが困難となるものであり、
一方２００気圧を越えた圧力を得るには、大がかりな装
置が必要となり、設備費の高いものとなり、経済的でな
いことから、その圧力を１〜２００気圧と定めた。(a) Atmospheric pressure If the pressure is less than 1 atm, sufficient sintering cannot be performed due to the temperature increase rate and holding time, and therefore, bores remain in the WCC cemented carbide after sintering. This makes it difficult to obtain the desired fracture resistance.
On the other hand, in order to obtain a pressure exceeding 200 atmospheres, a large-scale device is required, which results in high equipment costs and is not economical, so the pressure was set at 1 to 200 atmospheres.
（ｂ）温 度
焼結温度が１３００℃未満では、焼結が十分に進行せず
、所望の強度を確保することができず、一方焼結温度が
１５００℃を越えると、ＷＣやその他の構成成分に粒成
長が起るようになって、所望の耐欠損性を確保すること
ができなくなることから、焼結温度を１３００〜１５０
０℃と定めた。(b) Temperature If the sintering temperature is less than 1300°C, sintering will not proceed sufficiently and the desired strength cannot be secured, whereas if the sintering temperature exceeds 1500°C, the WC and other structures Since grain growth occurs in the components and it becomes impossible to secure the desired fracture resistance, the sintering temperature is set to 1300 to 150.
The temperature was set at 0°C.
（ｃ） 昇温速度および保持時間
焼結温度への昇温速度および焼結温度での保持時間は経
験的に定めたものであって、昇温速度が３００℃／ｈｒ
未満と遅くなっても、また保持時間が１時間を越えて長
くなってもＷＣＣ超超硬合金構成成分が粒成長するよう
になり、所望の耐欠損性を確保することができなくなる
ことから、昇温速度を３００℃／ｈｒ以上、保持時間を
１時間以下と定めた。(c) Temperature increase rate and holding time The temperature increase rate to the sintering temperature and the holding time at the sintering temperature were determined empirically, and the temperature increase rate was 300°C/hr.
Even if the holding time is less than 1 hour or longer than 1 hour, the WCC cemented carbide constituents will begin to grow grains, making it impossible to secure the desired fracture resistance. The temperature increase rate was set at 300° C./hr or more, and the holding time was set at 1 hour or less.
つぎに、この発明の方法を実施例により具体的に説明す
る。Next, the method of the present invention will be specifically explained using examples.
原料粉末として、いずれも１〜６μｍの範囲内の平均粒
径を有するＷＣ粉末、ＶＣ粉末、（Ｗ。Raw material powders include WC powder, VC powder, and (W) powder, all of which have an average particle size within the range of 1 to 6 μm.
ＴＩ）Ｃ粉末、（Ｔａ 、Ｎｂ）Ｃ粉末、（Ｗ、ＴＩ
。TI) C powder, (Ta, Nb) C powder, (W, TI
.
Ｔａ）Ｃ粉末、ＴａＣ粉末、ＴｉＮ粉末、ＴａＮ粉末、
（Ｗ、ＴＩ 、Ｔａ）ＣＮ粉末、およびＣｏ粉末を用意
し、これら原料粉末をそれぞれ第１表に示される配合組
成に配合し、ボールミルにて７２時時間式粉砕混合し、
乾燥した後、ｔｏｂｇ／−の圧力にて圧粉体にプレス成
形し、ついで同じ（第１表に示される条件（真空雰囲気
以外はいずれもＡ「雰囲気）にて焼結することによって
本発明法１〜１０、比較法１〜７、および従来法１．２
をそれぞれ実施し、ＷＣＣ超超硬合金製造した。Ta) C powder, TaC powder, TiN powder, TaN powder,
(W, TI, Ta) CN powder and Co powder were prepared, these raw material powders were blended into the composition shown in Table 1, and pulverized and mixed in a ball mill for 72 hours.
After drying, the method of the present invention is press-formed into a green compact at a pressure of tobg/-, and then sintered under the same conditions shown in Table 1 (A "atmosphere" except for the vacuum atmosphere). 1 to 10, comparative methods 1 to 7, and conventional methods 1.2
were conducted to produce WCC cemented carbide.
なお、比較法１〜７は、いずれも焼結条件のうちのいず
れかの条件（第１表に※印を付したもの）がこの発明の
範囲から外れた条件で行なったものである。Note that Comparative Methods 1 to 7 were all conducted under conditions in which one of the sintering conditions (those marked with * in Table 1) was outside the scope of the present invention.
ついで、この結果得られた各種のＷＣＣ超超硬合金つい
て、耐摩耗性と靭性を評価する目的で、硬さ（ロックウ
ェル硬さＡスケール）と抗折力を測定し、さらに本発明
法５〜ｌＯ１比較法２．４〜７、および従来法２で製、
造されたＷＣＣ超超硬合金ついては、これを５ＰＰ４２
２形状の切削工具として用い、
被削材 ： ＳＮＣＭ４３９
（硬さ： ＨＢ２８０）の角材、
切削速度 ： １００ ｍ／ｗｉｎ ｓ送
リ ： ０．３５ｍｍ／ ｒｅｖ、、切込み
： ３＋ａｍ。Next, the hardness (Rockwell hardness A scale) and transverse rupture strength of the various WCC cemented carbides obtained as a result were measured for the purpose of evaluating wear resistance and toughness, and further, the hardness (Rockwell hardness A scale) and transverse rupture strength were measured. ~ Produced by lO1 comparative method 2.4-7 and conventional method 2,
For manufactured WCC cemented carbide, this is 5PP42
Used as a cutting tool with two shapes, workpiece material: SNCM439 (hardness: HB280) square material, cutting speed: 100 m/wins feed
Re: 0.35mm/rev,, depth of cut: 3+am.
切削時間 ：３１１ｎ−。Cutting time: 311n-.
の条件で鋼の断続切削試験を行ない、試験切刃数＝ｌＯ
個のうちの欠損切刃数を測定し、耐欠損性を評価した。Conduct an interrupted cutting test on steel under the conditions of
The number of chipped cutting edges among the pieces was measured and chipping resistance was evaluated.
これらの結果を第１表に示した。These results are shown in Table 1.
第１表に示される結果から、本発明法１〜ｌＯによって
製造されたｗｃ、ｍ超硬合金は、いずれも高い硬さと抗
折力を示し、これらの値は従来法１゜２で製造された同
一組成のＷＣＣ超超硬合金比して一段と高いものであり
、さらに断続切削試験ですぐれた耐欠損性を示すことが
明らかである。−方比較法１〜７で製造されたＷＣＣ超
超硬合金見られるように、焼結条件のうちのいずれかの
条件でもこの発明の範囲から外れると耐欠損性の低いも
のとなり、比較法１〜３で製造されたＷＣＣ超超硬合金
はボアの存在が見られ、また従来法１で製造されたＷＣ
Ｃ超超硬合金もボアが見られた。From the results shown in Table 1, the wc and m cemented carbides produced by the methods 1 to 1O of the present invention all exhibit high hardness and transverse rupture strength, and these values are higher than those produced by the conventional method 1゜2. It is clear that the fracture resistance is much higher than that of WCC cemented carbide of the same composition, and furthermore, it shows excellent fracture resistance in the interrupted cutting test. - As can be seen in the WCC cemented carbide manufactured by Comparative Methods 1 to 7, if any of the sintering conditions deviates from the scope of this invention, the fracture resistance will be low, and Comparative Method 1 The presence of bores was observed in the WCC cemented carbide manufactured by method 1 to 3, and the WC cemented carbide manufactured by conventional method 1
Bores were also observed in C cemented carbide.
上述のように、この発明の方法によれば、耐欠損性およ
び耐摩耗性のすぐれたＷＣＣ超超硬合金製造することが
でき、したがってこれを切削工具として用いた場合には
、連続切削は勿論のこと、特に断続切削ですぐれた性能
を発揮するのである。As mentioned above, according to the method of the present invention, it is possible to produce WCC cemented carbide with excellent fracture resistance and wear resistance. Therefore, when this is used as a cutting tool, it can be used not only for continuous cutting but also for continuous cutting. It shows excellent performance, especially in interrupted cutting.
Claims (1)
して、その焼結条件を、 雰囲気：アルゴンガス、 雰囲気圧力：１〜２００気圧、 温度：１３００〜１５００℃、 昇温速度：３００℃／ｈｒ以上、 保持時間：１時間以下、 とすることを特徴とする切削工具用炭化タングステン基
超硬合金の製造法。[Claims] When producing a tungsten carbide-based cemented carbide for cutting tools, the sintering conditions are as follows: Atmosphere: Argon gas; Atmospheric pressure: 1 to 200 atm; Temperature: 1300 to 1500°C; Temperature increase rate: A method for producing a tungsten carbide-based cemented carbide for cutting tools, characterized by: 300° C./hr or more, holding time: 1 hour or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62315730A JP2512973B2 (en) | 1987-12-14 | 1987-12-14 | Manufacturing method of tungsten carbide based cemented carbide for cutting tools |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62315730A JP2512973B2 (en) | 1987-12-14 | 1987-12-14 | Manufacturing method of tungsten carbide based cemented carbide for cutting tools |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01156439A true JPH01156439A (en) | 1989-06-20 |
| JP2512973B2 JP2512973B2 (en) | 1996-07-03 |
Family
ID=18068842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62315730A Expired - Lifetime JP2512973B2 (en) | 1987-12-14 | 1987-12-14 | Manufacturing method of tungsten carbide based cemented carbide for cutting tools |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2512973B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1557230A1 (en) * | 2004-01-26 | 2005-07-27 | Sandvik Intellectual Property HB | Cemented carbide twist drill |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54132412A (en) * | 1978-03-31 | 1979-10-15 | Fujikoshi Kk | Production of sintered body for brazing use |
| JPS61227147A (en) * | 1985-03-28 | 1986-10-09 | フリード・クルツプ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Hard alloy and its production |
-
1987
- 1987-12-14 JP JP62315730A patent/JP2512973B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54132412A (en) * | 1978-03-31 | 1979-10-15 | Fujikoshi Kk | Production of sintered body for brazing use |
| JPS61227147A (en) * | 1985-03-28 | 1986-10-09 | フリード・クルツプ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Hard alloy and its production |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1557230A1 (en) * | 2004-01-26 | 2005-07-27 | Sandvik Intellectual Property HB | Cemented carbide twist drill |
| US7297176B2 (en) | 2004-01-26 | 2007-11-20 | Sandvik Intellectual Property Ab | Cemented carbide body |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2512973B2 (en) | 1996-07-03 |
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