JPS6362348B2 - - Google Patents
Info
- Publication number
- JPS6362348B2 JPS6362348B2 JP19695085A JP19695085A JPS6362348B2 JP S6362348 B2 JPS6362348 B2 JP S6362348B2 JP 19695085 A JP19695085 A JP 19695085A JP 19695085 A JP19695085 A JP 19695085A JP S6362348 B2 JPS6362348 B2 JP S6362348B2
- Authority
- JP
- Japan
- Prior art keywords
- abrasive grains
- grinding wheel
- abrasive
- grains
- binder
- 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
Links
- 239000006061 abrasive grain Substances 0.000 claims description 75
- 238000000227 grinding Methods 0.000 claims description 42
- 239000011230 binding agent Substances 0.000 claims description 30
- 239000007767 bonding agent Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 7
- 229910003460 diamond Inorganic materials 0.000 claims description 6
- 239000010432 diamond Substances 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052582 BN Inorganic materials 0.000 claims description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 description 5
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 2
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 201000004569 Blindness Diseases 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000007582 slurry-cast process Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Landscapes
- Polishing Bodies And Polishing Tools (AREA)
Description
〔産業上の利用分野〕
この発明は超砥粒研削砥石に関するものであ
る。
〔従来の技術〕
従来広く用いられてきたアルミナ質系砥粒と比
較して立方晶窒化硼素（以下これをCBNと略称
する）砥粒は約２倍の硬さをもち、さらに強靭で
破壊されにくいことから、鋼の研削用として特に
自動車部品または軸受部品等の精密量産分野にお
いてその特徴を生かし実用化が急速に拡大しつつ
ある。このような実用化拡大のなかで、高価な
CBN砥粒の使用量を少なくして原料費を低廉に
したCBN砥石によつて経済的効果のある研削加
工を行なう目的から、たとえば、特公昭52−3147
号、特開昭54−51090号、特開昭55−20826号など
に示されたようなCBN砥粒と白色アルミナ質系
（以下これをWAと略称する）砥粒との混合砥石
が開発された。これら混合砥石はWA砥粒に適応
するビトリフアイド結合剤によつて性質の異なる
砥粒を同時に結合させたものである。一般に物理
的または化学的な性質の相違する別種の砥粒を同
一結合剤を使用して同時に結合させたときには、
それぞれの砥粒の結合剤に対する親和性（結合
力）に差を生ずる結果になる。したがつて、従来
のCBN砥粒を混入した砥石はCBN砥粒には不向
きな結合剤を使用したものであるから、WA砥粒
に対しては望ましい結合力を示してもCBN砥粒
に対しては充分な結合力を示すとは言えず、特に
CBN砥粒の混入割合が増加すればするほどその
欠陥は顕著に現われ、研削性能は期待どおり発揮
されないことになる。すなわち、折角低コストの
CBN砥粒を使用しても研削比、経済性は低下し、
仕上げ面粗さは悪化して、総合的には利点はなく
不採用となる場合が多い。
また、経済的なCBN砥粒を目的とし砥石中に
占める割合（集中度）の低いCBN砥粒において、
CBN砥粒に近似の熱膨脹係数を有する酸化物粒
子等を骨材としてCBN砥粒とともに砥石中に配
合し、集中度を下げることによつて砥粒保持力の
低下を防ぐ試み（たとえば特開昭58−82677号）
等もある。
〔発明が解決しようとする問題点〕
以上述べたように従来のCBN砥粒もしくはダ
イヤモンド砥粒を混入した砥石は、これら砥粒に
対する結合力（保持力）の低下に基づいて砥石の
研削性能が発揮されなくなり、経済的にも全く不
利となるという問題点があつた。
〔問題を解決するための手段〕
上記の問題点を解決するために、この発明は
CBNもしくはダイヤモンド等の超砥粒と、WA
もしくは炭化珪素質系の砥粒とを配合したビトリ
フアイド研削砥石において、それぞれの成分組成
が異なる少なくとも３種類のビトリフアイド結合
剤を使用して、砥粒の種類別に砥粒表面を異なる
結合剤で被覆した後、これら砥粒を混合してさら
に別の異種結合剤で結合させた超砥粒研削砥石と
する手段を採用したものである。以下その詳細を
述べる。
まず、通常ビトリフアイド結合剤は主成分とし
て珪酸SiO270％（％はモル百分率、以下同じ）
以上、アルミナAl2O310％以上を含有し、さらに
800℃付近の比較的低温もしくは1000℃以上の比
較的高温下で作用して融化（ビトリフアイド）を
促進させるための融剤が配合されたものであり、
融剤としてはWAもしくは炭化珪素質砥粒に対し
て硼酸B2O3、酸化リチウムLi2O、酸化鉛PbO、
酸化マグネシウムMgO、石灰CaO等を、また、
CBN砥粒に対しては低膨脹係数で微細結晶を可
能とする弗化リチウムLiF等（特公昭57−49351
号）を上記融剤に追加して例示することができ
る。ここで結合剤の選択にあたつては、砥粒の熱
膨脹係数よりも小さい熱膨脹係数を有する結合剤
であることが基本的に大切である。なぜならば特
に架橋型（ブリツジタイプ）の有機孔砥石では、
埋込み型（マトリツクスタイプ）の無気孔砥石に
比較して、砥粒支持力（ボルドグリツプ）が充分
に強固でないと研削比の高い経済的な研削加工が
遂行できないばかりか、高速回転する研削作業で
は砥石破壊を起こすからである。したがつて、従
来の砥石製造技術では各種の砥粒にそれぞれ適合
するビトリフアイド結合剤が経験的に開発され実
用に供されているので、この発明においては各種
の砥粒単味に適応する結合剤を使用して砥粒の種
類別にそれぞれの結合剤被膜を形成し、得られた
２種もしくはそれ以上の異種砥粒を混合して、さ
らに異種結合剤によつて所望の形状に成形した砥
石とすることによつて、各砥粒の支持力を弱化さ
せることなく有気孔のブリツジタイプの砥石の製
造も可能となるのである。
ここで、この発明において、WA系もしくは炭
化珪素質系砥粒を被覆するビトリフアイド結合剤
の量はCBNもしくはダイヤモンド砥粒を被覆し
たビトリフアイド結合剤の量よりも容量として1/
２以下であることが望ましい。なぜならばCBNも
しくはダイヤモンド砥粒と比較して軟質でしかも
脆いWA系もしくは炭化珪素質系砥粒を必要以上
に厚い結合剤の層で被覆することは、研削中にこ
の砥粒の特徴でもある鋭刃の顕出作用を妨げる結
果、目つぶれ、目づまりなどによつてチツピング
現象を起こし研削加工上種々の不都合を生ずるか
らであつて、砥石中のCBNもしくはダイヤモン
ド砥粒の結合剤被覆容積率は８〜25％とし、これ
に対してWA系もしくは炭化珪素質系砥粒のそれ
は３〜12％とすることが好ましい。
また、このようにして異種類の結合剤で被覆し
た砥粒を混合してこれらを結合させるための結合
剤組成は、強力な溶融剤であるナトリウム
（Na2O）、カリウム（K2O）、リチウム（Li2O）
などのアルカリ類が少ないかもしくは含有しない
熱膨脹係数の小さい高温溶融性の結合剤が好まし
い。なぜならば、ここで使用する結合剤は砥粒に
直接作用して支持強度を得ることを目的とするの
ではなくて、砥粒表面を被覆している結合剤と隠
やかに作用して砥粒相互の間にブリツジを形成
し、砥石中に砥粒を均一でしかも安定して分散さ
せておくことが目的であるからである。したがつ
て、このような目的の結合剤は砥粒表面の結合剤
被覆に強く作用して砥粒支持力が返えつて弱化し
ないことが大切であるから、この結合剤の容積率
は５〜15％程度がよく、これを越える多量は好ま
しくない。
なお、砥粒表面に結合剤被覆を形成する方法
は、たとえば砥粒および結剤を粉末状で混合し、
これに適量のテキストリン等の糊剤を添加して比
較的乾燥した状態で混合するか、または多量の水
を加えて泥漿状とし、この泥漿鋳込体を乾燥した
粉状に砕いてもよく、被覆された砥粒同士の混合
は粉状のまま乾式で行ない、所望の形状に圧縮成
形後乾燥および焼成すればよい。
〔実施例〕
まず、超砥粒としてCBN砥粒（米国ゼネラ
ル・エレクトリツク社製：＃200/230）60重量部
とWA砥粒（＃220）40重量部とを混合するにあ
たつて、第１表に示すようにCBN砥粒に対して
は結合剤Ａを、WA砥粒に対しては結合剤Ｂを、
また被覆されたCBNおよびWA両砥粒の混合砥
粒に対しては結合剤Ｃをそれぞれ用いた。そして
作製した試料砥石１および２はいずれ
[Industrial Field of Application] This invention relates to a superabrasive grinding wheel. [Conventional technology] Compared to alumina-based abrasive grains that have been widely used in the past, cubic boron nitride (hereinafter abbreviated as CBN) abrasive grains are approximately twice as hard, and are also tougher and more resistant to fracture. Because it is difficult to grind steel, its practical use is rapidly expanding by taking advantage of its characteristics, especially in the precision mass production field of automobile parts and bearing parts. With the expansion of practical use, expensive
For the purpose of economically effective grinding using a CBN grinding wheel that uses less CBN abrasive grains and lowers raw material costs, for example,
A mixed grinding wheel consisting of CBN abrasive grains and white alumina abrasive grains (hereinafter abbreviated as WA) was developed as shown in Japanese Patent Application Laid-open No. 54-51090, Japanese Patent Application Laid-open No. 55-20826, etc. Ta. These mixed abrasive wheels are made by bonding abrasive grains with different properties at the same time using a vitrified bonding agent that is compatible with WA abrasive grains. Generally, when different types of abrasive grains with different physical or chemical properties are bonded together using the same bonding agent,
This results in differences in the affinity (bonding strength) of each abrasive grain for the binder. Therefore, conventional grinding wheels mixed with CBN abrasive grains use a bonding agent that is unsuitable for CBN abrasive grains, so even if they exhibit desirable bonding strength for WA abrasive grains, they do not work well for CBN abrasive grains. It cannot be said that they exhibit sufficient bonding strength, especially when
As the proportion of CBN abrasive grains increases, the defects become more noticeable, and the grinding performance will not be as expected. In other words, a low-cost
Even if CBN abrasive grains are used, the grinding ratio and economic efficiency will decrease.
The finished surface roughness deteriorates, and there is no overall advantage and the method is often rejected. In addition, for the purpose of economical CBN abrasive grains, CBN abrasive grains with a low proportion (concentration degree) in the grinding wheel,
An attempt was made to prevent a decrease in abrasive grain retention by combining oxide particles with a coefficient of thermal expansion similar to that of CBN abrasive grains as an aggregate into a grinding wheel together with CBN abrasive grains to reduce the degree of concentration (for example, in JP-A-Sho 58-82677)
etc. [Problems to be solved by the invention] As mentioned above, the grinding performance of the conventional grinding wheel mixed with CBN abrasive grains or diamond abrasive grains deteriorates due to the decrease in the bonding force (holding force) to these abrasive grains. The problem was that it was no longer effective, and it was economically disadvantageous. [Means for solving the problem] In order to solve the above problems, this invention
Super abrasive grains such as CBN or diamond and WA
Alternatively, in a vitrified grinding wheel blended with silicon carbide-based abrasive grains, at least three types of vitrified binders having different component compositions are used, and the abrasive grain surfaces are coated with different binders for each type of abrasive grain. Thereafter, these abrasive grains are mixed and further bonded with another different type of binder to form a superabrasive grinding wheel. The details will be described below. First of all, vitrified binders usually have 70% silicate SiO2 as the main component (% is molar percentage, the same applies hereinafter).
Contains 10% or more of alumina Al 2 O 3 , and
It contains a fluxing agent that acts at a relatively low temperature of around 800℃ or a relatively high temperature of 1000℃ or higher to promote melting (vitrification).
For WA or silicon carbide abrasive grains, boric acid B 2 O 3 , lithium oxide Li 2 O, lead oxide PbO,
Magnesium oxide MgO, lime CaO, etc.
For CBN abrasive grains, lithium fluoride LiF, which enables fine crystals with a low expansion coefficient, etc. (Special Publication No. 57-49351
No.) can be added to the above-mentioned fluxing agent. When selecting the binder here, it is basically important that the binder has a coefficient of thermal expansion smaller than that of the abrasive grains. This is because, especially with bridge-type organic drilling stones,
Compared to embedded type (matrix type) non-porous grindstones, if the abrasive grain supporting force (bord grip) is not sufficiently strong, economical grinding with a high grinding ratio cannot be performed, and it is difficult to perform grinding operations that rotate at high speeds. This is because it will cause the grindstone to break. Therefore, in the conventional grinding wheel manufacturing technology, vitrified binders that are suitable for various types of abrasive grains have been empirically developed and put into practical use. A bonding agent coating is formed for each type of abrasive grain using the following methods, and two or more types of different types of abrasive grains obtained are mixed and then formed into a desired shape using a different type of bonding agent. By doing so, it is also possible to manufacture a bridge-type grindstone with pores without weakening the supporting force of each abrasive grain. Here, in this invention, the amount of the vitrified bonding agent coating the WA-based or silicon carbide-based abrasive grains is 1/1/2 in volume compared to the amount of the vitrified bonding agent coating the CBN or diamond abrasive grains.
It is desirable that it is 2 or less. This is because coating WA-based or silicon carbide-based abrasive grains, which are softer and more brittle than CBN or diamond abrasive grains, with an unnecessarily thick layer of bonding agent prevents sharpening during grinding, which is also a characteristic of this abrasive grain. This is because as a result of interfering with the revealing action of the blade, chipping occurs due to blindness and clogging, which causes various inconveniences in grinding. It is preferably 8 to 25%, whereas that of WA-based or silicon carbide-based abrasive grains is preferably 3 to 12%. In addition, the binder composition used to mix and bond abrasive grains coated with different types of binders is strong melting agents such as sodium (Na 2 O) and potassium (K 2 O). , lithium ( Li2O )
It is preferable to use a high-temperature melting binder with a low coefficient of thermal expansion that contains little or no alkali such as. This is because the bonding agent used here does not directly act on the abrasive grains to provide support strength, but rather acts secretly with the bonding agent coating the surface of the abrasive grains to improve the abrasive strength. This is because the purpose is to form bridges between grains and to uniformly and stably disperse the abrasive grains in the grindstone. Therefore, it is important that the binder for this purpose does not act strongly on the binder coating on the abrasive grain surface and weaken the abrasive grain supporting force, so the volume ratio of this binder should be 5 to 5. About 15% is good, and a large amount exceeding this is not preferable. The method of forming a binder coating on the surface of the abrasive grains is, for example, by mixing the abrasive grains and binder in powder form,
You can add an appropriate amount of a sizing agent such as Textlin and mix it in a relatively dry state, or you can add a large amount of water to make a slurry, and then crush this slurry casting into a dry powder. The coated abrasive grains may be mixed together in a dry process while in powder form, and after compression molding into a desired shape, they are dried and fired. [Example] First, when mixing 60 parts by weight of CBN abrasive grains (manufactured by General Electric Company, USA: #200/230) and 40 parts by weight of WA abrasive grains (#220) as superabrasive grains, As shown in Table 1, binder A is used for CBN abrasive grains, binder B is used for WA abrasive grains,
In addition, Binder C was used for the mixed abrasive grains of both coated CBN and WA abrasive grains. The prepared sample grindstones 1 and 2 are
【表】
も焼成後の砥石組織が容積割合で気孔率35％、結
合剤率26％、CBN砥粒率25％（集中度100）とな
るように生砥石の嵩比重を予め求めておき加圧成
形した。第２表に砥粒の結合剤被覆重量％を具体
的に示したが、試料砥石１においてはCBN砥粒
69部に結合剤A31部を、また、WA砥粒80部に結
合剤B20部をそれぞれ被覆した後両砥粒を混合し
て圧縮成形したものであり、試料砥石２において
は両被覆砥粒にさらに両混合砥粒91[Table] The bulk specific gravity of the raw whetstone was determined in advance and added so that the whetstone structure after firing would have a porosity of 35%, a binder rate of 26%, and a CBN abrasive grain rate of 25% (concentration level 100). Press molded. Table 2 specifically shows the weight percent of the binder coating on the abrasive grains.
69 parts of the abrasive grains were coated with 31 parts of the binder A, and 80 parts of the WA abrasive grains were coated with 20 parts of the binder B, and then both abrasive grains were mixed and compression molded. In addition, both mixed abrasive grains 91
【表】
部に対し結合剤Ｃを９部配合した後成形したもの
である。そして、従来の製造方法によつてCBN
砥粒とWA砥粒とを区別することなく、両砥粒73
部に対し結合剤Ｃを27部配合した砥石を対照品に
選んだ。このような３種類の砥石は製品寸法が外
径15mm、厚さ17mm、内径16mmの円筒状になるよう
成形し、乾燥後乾燥窒素雰囲気中で最高温度1240
℃で２時間保持し合計所要時間42時間焼成した。
焼成後仕上げされた各砥石は研削盤（株式会社
マツダ製）により軸受鋼（SUJ、硬さHRＣ58/6
２）、外径30mm、幅13mm、内径20mmの加工物内面を
加工物速度毎分7.1m（毎分1135回転）、砥石速度
毎分2400m（毎分51000回転）、砥石微小往復速度
毎分190回、ソリユブル型水溶性油（70倍希釈）
の条件下で研削加工に供された。なお、ドレツシ
ングはカツプ型ロータリドレツサーにより、また
砥石切込みは定研削力制御装置により実際の研削
力である接線方向研削力を制御しながら研削実験
を行なつたので、砥石切れ味は研削性能の差によ
つて研削時間に変化を生じ研削性の悪いときは長
時間を要することになる。得られた研削加工の結
果を第３表にまとめた。
第３表から明らかなように、異種の結合剤でそ
れぞれを被覆した砥粒を単に混合して成形した試
料砥石１は対照品である従来の砥石と比較して砥
石摩耗量も少なく、また研削性もよく、研削面粗[Table] Molded after adding 9 parts of binder C to 1 part. Then, CBN is manufactured using conventional manufacturing methods.
Without distinguishing between abrasive grains and WA abrasive grains, both abrasive grains 73
A grindstone containing 27 parts of binder C per 1 part of the grinding agent was selected as a control product. These three types of grindstones are molded into a cylindrical shape with an outer diameter of 15 mm, a thickness of 17 mm, and an inner diameter of 16 mm. After drying, they are heated to a maximum temperature of 1240 °C in a dry nitrogen atmosphere.
It was held at ℃ for 2 hours and fired for a total time of 42 hours. After firing, each finished whetstone is polished using a grinding machine (manufactured by Mazda Corporation) with bearing steel (SUJ, hardness H R C58/6).
2) The inner surface of a workpiece with an outer diameter of 30 mm, a width of 13 mm, and an inner diameter of 20 mm is processed at a workpiece speed of 7.1 m/min (1135 revolutions per minute), a grinding wheel speed of 2400 m/min (51000 revolutions per minute), and a grinding wheel minute reciprocating speed of 190 m/min. Soluble water-soluble oil (70 times dilution)
It was subjected to grinding under the following conditions. The dressing was carried out using a cup-type rotary dresser, and the grinding wheel was controlled using a constant grinding force controller to control the tangential grinding force, which is the actual grinding force. The grinding time will vary depending on the difference, and if the grindability is poor, it will take a long time. The results of the obtained grinding process are summarized in Table 3. As is clear from Table 3, Sample Grinding Wheel 1, which was formed by simply mixing abrasive grains coated with different types of binders, had less wear on the grinding wheel compared to the conventional grinding wheel as a control product, and It has good properties and has a rough ground surface.
以上のことから明らかなように、この発明の超
砥粒研削砥石は従来の砥石に比較して、砥粒に対
する結合力（保持力）の低下に基づいて砥石の研
削性能が失われるようなことはなく、経済的にも
きわめて有利なものであるという言うことができ
る。
As is clear from the above, compared to conventional grinding wheels, the superabrasive grinding wheel of the present invention does not lose its grinding performance due to a decrease in the binding force (holding force) to the abrasive grains. It can be said that it is extremely advantageous economically.
Claims (1)
砥粒と、アルミナ質系もしくは炭化珪素質系砥粒
とを配合したビトリフアイド研削砥石において、
それぞれの成分組成が異なる少なくとも３種類の
ビトリフアイド結合剤を使用して、砥粒の種類別
に砥粒表面を異なる結合剤で被覆した後、これら
砥粒を混合してさらに別の異種結合剤で結合させ
たことを特徴とする超砥粒研削砥石。 ２ アルミナ質系もしくは炭化珪素質系砥粒の表
面を被覆したビトリフアイド結合剤の量が、立方
晶系窒化硼素もしくはダイヤモンド等の超砥粒の
表面を被覆したビトリフアイド結合剤の量よりも
容量として1/2以下である特許請求の範囲第１項
記載の超砥粒研削砥石。 ３ 砥粒の種類別に成分組成の異なるビトリフア
イド結合剤で表面を被覆した砥粒を混合し、これ
らを結合させるビトリフアイド結合剤の量が砥石
容積中５〜15容量％である特許請求の範囲第１項
記載の超砥粒研削砥石。[Scope of Claims] 1. A vitrified grinding wheel in which superabrasive grains such as cubic boron nitride or diamond are blended with alumina-based or silicon carbide-based abrasive grains,
Using at least three types of vitrified binders with different component compositions, the abrasive grain surfaces are coated with different binders for each type of abrasive grain, and then these abrasive grains are mixed and further bonded with another different type of binder. A super-abrasive grinding wheel characterized by: 2 The amount of the bitrified bonding agent coating the surface of the alumina-based or silicon carbide-based abrasive grains is 1 larger in volume than the amount of the bitrified bonding agent coating the surface of the superabrasive grains such as cubic boron nitride or diamond. The superabrasive grinding wheel according to claim 1, wherein the superabrasive grinding wheel has a particle diameter of /2 or less. 3.Abrasive grains whose surfaces are coated with vitrified binders having different component compositions depending on the type of abrasive grains are mixed, and the amount of the vitrified binder used to bind these together is 5 to 15% by volume based on the volume of the grinding wheel.Claim 1 The superabrasive grinding wheel described in Section 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19695085A JPS6257874A (en) | 1985-09-04 | 1985-09-04 | Super abrasive grain grindstone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19695085A JPS6257874A (en) | 1985-09-04 | 1985-09-04 | Super abrasive grain grindstone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6257874A JPS6257874A (en) | 1987-03-13 |
| JPS6362348B2 true JPS6362348B2 (en) | 1988-12-02 |
Family
ID=16366354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19695085A Granted JPS6257874A (en) | 1985-09-04 | 1985-09-04 | Super abrasive grain grindstone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6257874A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0513955U (en) * | 1991-08-02 | 1993-02-23 | カモ井加工紙株式会社 | Cool bag |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01171767A (en) * | 1987-12-24 | 1989-07-06 | Taiho Ind Co Ltd | Precision polishing whetstone |
| JP2808111B2 (en) * | 1987-12-24 | 1998-10-08 | タイホー工業株式会社 | Whetstone for precision polishing and precision polishing method |
| JPH0386465A (en) * | 1989-08-25 | 1991-04-11 | Mizuho Kenma Toishi Kk | Super finishing abrasive for super hard abrasive grain |
| JP2653739B2 (en) * | 1992-02-20 | 1997-09-17 | 豊田工機株式会社 | Vitrified CBN grinding wheel |
-
1985
- 1985-09-04 JP JP19695085A patent/JPS6257874A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0513955U (en) * | 1991-08-02 | 1993-02-23 | カモ井加工紙株式会社 | Cool bag |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6257874A (en) | 1987-03-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |