JP2896424B2 - Manufacturing method of sintered fine super abrasive - Google Patents
Manufacturing method of sintered fine super abrasiveInfo
- Publication number
- JP2896424B2 JP2896424B2 JP63196300A JP19630088A JP2896424B2 JP 2896424 B2 JP2896424 B2 JP 2896424B2 JP 63196300 A JP63196300 A JP 63196300A JP 19630088 A JP19630088 A JP 19630088A JP 2896424 B2 JP2896424 B2 JP 2896424B2
- Authority
- JP
- Japan
- Prior art keywords
- cemented carbide
- sintered
- zinc
- iron group
- group metal
- 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
Landscapes
- Polishing Bodies And Polishing Tools (AREA)
- Carbon And Carbon Compounds (AREA)
Description
【発明の詳細な説明】 本発明は焼結微細超研摩材およびその製造方法特にダ
イヤモンドやｃ−BNなどの微細粒子を含有する使用済み
または棄却品焼結物ないしコンパクトから、有用な砥粒
等の研摩材を製造する方法、並びにこの様にして製造さ
れた研摩材に関する。The present invention relates to a sintered fine superabrasive and a method for producing the same, particularly from a used or rejected sintered product or compact containing fine particles such as diamond and c-BN, to useful abrasives and the like. The present invention also relates to a method for producing an abrasive, and an abrasive produced in this manner.
近年、電子工業を初めとする精密加工業の分野におい
て、ダイヤモンドやｃ−BNのような高圧相窒化硼素の密
集結体ないしコンパクトのチップを用いた工具が多用さ
れている。2. Description of the Related Art In recent years, in the field of the precision processing industry including the electronics industry, tools using densely packed or compact chips of high-pressure phase boron nitride such as diamond and c-BN have been widely used.
これらは構成単位の超硬質微細結晶の大部分が相互に
直接結合されている成形研摩材である。これは使用によ
り摩耗するとドレッシングを受けて再度使用されるが、
ドレッシングを数回経ると切れ刃が形成できなくなるの
で、廃棄される。しかしこれらの内部には未使用の、使
用に耐える超硬質砥粒が多量に合まれており、加えてこ
の様なコンパクトが高価なことから、これをそのまま廃
棄することは、経済的に好ましいことではない。These are shaped abrasives in which the majority of the superhard microcrystals of the constituent units are directly bonded to one another. If this wears out after use, it is dressed and used again,
After several dressings, the cutting edge cannot be formed and is discarded. However, a large amount of unused, hard-to-use ultra-hard abrasive grains are combined inside them, and in addition, such compacts are expensive, and it is economically preferable to discard them as they are. is not.
一方、コンバクトは原料の例えばダイヤモンド微粉を
超高圧・高温下で焼結して製造される。取出された反応
物（通常は円板状）はさらにワイヤカット等で所望の形
状（例えば扇形）に切断される。この過程には比較的困
難が伴い、切断品数個のうち１〜数個が商品価値を失
う。しかしこれは研摩材として充分使用に耐えるダイヤ
モンド粒子を多量に含むので、これをこのまま廃棄する
ことも、同様に不経済である。On the other hand, a compact is produced by sintering, for example, a diamond fine powder as a raw material under ultra-high pressure and high temperature. The removed reactant (usually a disk) is further cut into a desired shape (for example, a sector) by wire cutting or the like. This process is relatively difficult, and one to several of the cut pieces lose their commercial value. However, since this contains a large amount of diamond particles that can be sufficiently used as an abrasive, it is similarly uneconomical to discard it as it is.
この様な観点から、これらの使用済み、ないし不良コ
ンバクトの再利用法ないし有効な利用法の開発が望まれ
ていた。しかしこれらの廃品・棄却品は、相互に直接結
合したダイヤモンドやｃ−BNなどの超硬質粒子の層が超
硬のブロックと接合された構造を有しており硬度が極め
て高いため、機械的破砕は困惑を極め、この廃品から有
用な研摩材を得るための有勃な方法は知られていない。From such a viewpoint, it has been desired to develop a method of reusing or effectively using used or defective products. However, these waste and rejected products have a structure in which a layer of super-hard particles such as diamond and c-BN directly bonded to each other is bonded to a super-hard block. Is extremely confused, and there is no known elaborate method for obtaining useful abrasives from this junk.
さらにこの様な焼結物は、微細な（通常平均粒度100
μｍ以下）ダイヤモンド粒子同志が直接結合したダイヤ
モンド層を有するので、この層を適度の粒径の粒子に砕
けば、平均粒径が教十ないし数ミクロン級、或いはサブ
ミクロン級の微細な単位粒子による高精度の加工性能を
有しながら、工具製作時の操作性の良い研摩材を得るこ
とが期待される。Further, such a sintered product is fine (usually having an average particle size of 100
(μm or less) Diamond particles have a diamond layer directly bonded to each other. If this layer is crushed into particles of an appropriate particle size, the average particle size can be as small as 10 to several microns or sub-micron. It is expected that an abrasive material with good operability at the time of tool making can be obtained while having high-precision machining performance.
従って本発明はこれらの廃品を効果的に分解して研摩
材粒子を形成する方法を提供することにより、この様な
課題に回答を与えるものである。そして本発明の要旨
は、ダイヤモンドおよび／または高圧相窒化硼素の微細
結晶の焼結物と、金属相主成分としてコバルトまたは他
の鉄族金属元素を含む超硬合金とからなる複合体を溶融
亜鉛と共に加熱し、超硬合金内並びに超硬合金と焼結物
との間に介在する鉄族金属の少なくとも一部を亜鉛と合
金化させ、こうして超硬合金内および超硬合金と焼結物
との間の結合を弱めた後、超硬合金を機械的および／ま
たは化学的に焼結物から分離・除去し、さらに必要に応
じて機械的に破砕・整粒することを特徴とする、焼結微
細超研摩材の製造方法、にある。Accordingly, the present invention provides an answer to such a problem by providing a method for effectively decomposing these waste products to form abrasive particles. The gist of the present invention is to form a composite comprising a sintered product of fine crystals of diamond and / or high-pressure phase boron nitride and a cemented carbide containing cobalt or another iron group metal element as a metal phase main component. And at least part of the iron group metal interposed in the cemented carbide and between the cemented carbide and the sintered material is alloyed with zinc, and thus in the cemented carbide and in the cemented carbide and the sintered material. After weakening the bond between the cemented carbides, the cemented carbide is mechanically and / or chemically separated and removed from the sintered product, and if necessary, mechanically crushed and sized. Method for producing a fine super-abrasive.
本発明において原料として使用する焼結物中の超硬合
金は、結合材としてコバルト、または二ッケルその他の
鉄族金属を含有するものが適切である。焼結物（コンパ
クト）中には、各種の粒度の超硬質微細粒子を含有する
ことができる。この焼結物中には、溶浸材としての金
属、例えばダイヤモンドの場合には従来多用されている
コバルトその他（ニッケル等）の鉄族金属、あるいはこ
れらを主成分とする合金が、また立方晶窒化硼素の場合
にはアルミニウムまたはその合金が微量（本質的に不連
続な相として存在する程度）介在していてもよい。As the cemented carbide in the sintered material used as a raw material in the present invention, one containing cobalt or nickel or other iron group metal as a binder is suitable. The sintered product (compact) can contain ultra-hard fine particles of various particle sizes. In this sintered product, a metal as an infiltration material, for example, in the case of diamond, an iron group metal such as cobalt or nickel (nickel or the like) which has been frequently used, or an alloy containing these as a main component, is used. In the case of boron nitride, a trace amount of aluminum or its alloy (to the extent that it is present as an essentially discontinuous phase) may be present.
この焼結物と超硬合金とからなる焼結物は還元性雰囲
気で、多量の亜鉛と共に加熱する。使用する亜鉛の分量
はより少量でもそれなりの効果は得られるものの、操作
性の面から、被処理超硬中のコバルト含有量に対して同
重量以上が望ましく、特に被処理焼結物を浸漬するのに
十分な量とするのが好ましい。処理温度としては、実用
的な処理速度を得るには、600℃以上の温度が適当であ
る。工程において溶融された亜鉛は、超硬合金のWC粒子
を包囲して、また超硬合金と焼結物相との境界に介在す
るコバルトその他の銑族金属に沿って浸透してこれと合
金を形成する。この際に体積の増加が生じるため、構成
粒子間が拡げられる結果、超硬合金内、および超硬と焼
結物間の結合力が低下する。次にこの亜鉛を蒸留により
除去する。溶融合金中の亜鉛分は高融点の鉄族金属に比
べて蒸気圧が高いため優先的に気化し、排除される。工
程のための加熱時聞および温度はできるだけ短く、また
低くして、ダイヤモンドの物性への熱的影響を最小限に
抑えるようにする。The sintered product comprising the sintered product and the cemented carbide is heated together with a large amount of zinc in a reducing atmosphere. Although the amount of zinc used is small, a certain effect can be obtained, but from the viewpoint of operability, it is desirable that the weight is equal to or more than the cobalt content in the cemented carbide to be treated, and particularly, the sinter to be treated is immersed. It is preferable that the amount is sufficient. As a processing temperature, a temperature of 600 ° C. or more is appropriate for obtaining a practical processing speed. The zinc melted in the process surrounds the WC particles of the cemented carbide and penetrates along the cobalt and other pig-group metals that intervene at the boundary between the cemented carbide and the sintered material phase to impregnate the alloy with the WC particles. Form. At this time, since the volume increases, the constituent particles are expanded, and as a result, the bonding force in the cemented carbide and between the cemented carbide and the sintered product is reduced. The zinc is then removed by distillation. The zinc content in the molten alloy is vaporized and removed preferentially because of its higher vapor pressure than the high melting point iron group metal. The heating times and temperatures for the process are as short and low as possible to minimize the thermal effect on the physical properties of the diamond.
この段階では超硬合金と焼結物とはまだ接合したまま
であるが、超硬合金は多孔性のスケルトン構造となって
いる。一方焼結物内にも幾分鉄族金属が取込まれている
ことかあるが、これは全般的に互いに独立していて亜鉛
と反応しにくい上、粒子同志は互いに直接結合により強
力に接合されているので、この亜鉛処理の影響は少な
い。従ってこの段階の処理物を機械的操作および／また
は酸等の化学処理に供することにより、超硬分を容易に
除去し、焼結物を回収することができる。この様に処理
された超硬質粒子焼結物は用途に応じて単独で、或いは
他の品種と混合し、研摩材として使用に供する。At this stage, the cemented carbide and the sintered product are still joined, but the cemented carbide has a porous skeleton structure. On the other hand, some iron group metals may be incorporated in the sintered product, but they are generally independent of each other and difficult to react with zinc, and the particles are strongly bonded to each other by direct bonding Therefore, the effect of this zinc treatment is small. Therefore, by subjecting the treated product at this stage to mechanical operation and / or chemical treatment such as acid treatment, the superhard component can be easily removed and the sintered product can be recovered. The ultra-hard particle sintered material thus treated is used alone or mixed with other varieties depending on the application and used as an abrasive.
5/12μｍの微細なダイヤモンド粒子を含有する焼結層
と、WC−12％Coの超硬合金とからなる焼結物棄却品3kg
と、純度99.9％の亜鉛3kgとを黒鉛ルツボに入れ、密封
炉に入れて脱気した後、Arガスを導入し、温度880℃、
圧力0.01〜0.03kg/cm2（ゲージ圧）で20時間、溶融亜鉛
の浸透を行った。3kg rejected sintered product consisting of a sintered layer containing fine diamond particles of 5 / 12μm and a cemented carbide of WC-12% Co
And 3 kg of 99.9% pure zinc were placed in a graphite crucible, placed in a sealed furnace, degassed, and Ar gas was introduced.
The molten zinc was permeated at a pressure of 0.01 to 0.03 kg / cm 2 (gauge pressure) for 20 hours.
次に10-3Torr以上の真空を保ちながら、炉を当初880
℃で、その後950℃に合計12時間保持したあと温度を下
げ、処理品を取出した。これをジョークラッシャで粗く
砕いたあと水２容、HNO3１容、HF1容の混酸で処理して
残留超硬分を除去し、乾燥した。これはローラークラッ
シャで砕き60メッシュ程度の粒子として、研摩砥石の製
作に用いた。Next, while maintaining a vacuum of 10 -3 Torr or more, the furnace was initially set at 880
After maintaining the temperature at 950 ° C. for a total of 12 hours, the temperature was lowered and the treated product was taken out. This was coarsely crushed with a jaw crusher and then treated with a mixed acid of 2 volumes of water, 1 volume of HNO 3 and 1 volume of HF to remove residual superhardness and dried. This was crushed by a roller crusher and used as a grinding wheel as particles of about 60 mesh.
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B24D 3/00 C09K 3/14 C01B 31/06 Continuation of the front page (58) Field surveyed (Int. Cl. 6 , DB name) B24D 3/00 C09K 3/14 C01B 31/06
Claims (2)
素の微細結晶の焼結物と、金属相主成分としてコバルト
または他の鉄族金属元素を合む超硬合金とからなる複合
体を溶融亜鉛と共に加熱し、超硬合金内並びに超硬合金
と捷溝物との聞に介在する鉄族金属の少なくとも一部を
亜鉛と合金化させ、こうして超硬合金内および超硬合金
と焼結物との間の結合を弱めたのち、超硬合金を機械的
および／または化学的に焼結物から分離・除去すること
を特徴とする、焼結微細超研摩材の製造方法。1. A composite comprising a sintered product of fine crystals of diamond and / or high-pressure phase boron nitride and a cemented carbide containing cobalt or another iron group metal element as a metal phase main component together with molten zinc. By heating, at least a part of the iron group metal present in the cemented carbide and between the cemented carbide and the groove is alloyed with zinc. A method for producing a sintered fine superabrasive material, characterized by mechanically and / or chemically separating and removing a cemented carbide from a sintered material after weakening a bond between them.
素の微細結晶の焼結物と、金属相主成分としてコバルト
または他の鉄族金属元素を合む超硬合金とからなる複合
体を溶融亜鉛と共に加熱し、超硬合金内並びに超硬合金
と焼結物との間に介在する鉄族金属の少なくとも一部を
亜鉛と合金化させ、こうして超硬合金内および超硬合金
と焼結物との間の結合を弱めたのち、超硬合金を機械的
および／または化学的に焼結物から分離・除去し、さら
に焼結物を機械的にに破砕・整粒することを特徴とす
る、焼結微細超研摩材の製造方法。2. A composite comprising a sintered product of fine crystals of diamond and / or high-pressure phase boron nitride and a cemented carbide containing cobalt or another iron group metal element as a metal phase main component together with molten zinc. Heating, and at least a part of the iron group metal interposed in the cemented carbide and between the cemented carbide and the sintered material is alloyed with zinc; After weakening the bond between them, the sintering is characterized by mechanically and / or chemically separating and removing the cemented carbide from the sinter and mechanically crushing and sizing the sinter. Manufacturing method of knotted super abrasive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63196300A JP2896424B2 (en) | 1988-08-05 | 1988-08-05 | Manufacturing method of sintered fine super abrasive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63196300A JP2896424B2 (en) | 1988-08-05 | 1988-08-05 | Manufacturing method of sintered fine super abrasive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0248173A JPH0248173A (en) | 1990-02-16 |
| JP2896424B2 true JP2896424B2 (en) | 1999-05-31 |
Family
ID=16355515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63196300A Expired - Lifetime JP2896424B2 (en) | 1988-08-05 | 1988-08-05 | Manufacturing method of sintered fine super abrasive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2896424B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3814311B2 (en) * | 1995-03-31 | 2006-08-30 | 豊田バンモップス株式会社 | Method for producing composite abrasive grains |
| JP2002060733A (en) * | 2000-08-17 | 2002-02-26 | Ishizuka Kenkyusho:Kk | Diamond-polishing material particle and method for producing the same |
| JP2003039331A (en) | 2001-08-01 | 2003-02-13 | Noritake Co Ltd | Grinding wheel having resin core part, manufacturing method thereof, and recycling method thereof |
| CN102131887B (en) * | 2008-07-03 | 2013-07-31 | 3M创新有限公司 | Fixed abrasive particles and articles made therefrom |
-
1988
- 1988-08-05 JP JP63196300A patent/JP2896424B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0248173A (en) | 1990-02-16 |
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