JP2003071723A - Vitrified grinding wheel - Google Patents

Vitrified grinding wheel

Info

Publication number
JP2003071723A
JP2003071723A JP2001261657A JP2001261657A JP2003071723A JP 2003071723 A JP2003071723 A JP 2003071723A JP 2001261657 A JP2001261657 A JP 2001261657A JP 2001261657 A JP2001261657 A JP 2001261657A JP 2003071723 A JP2003071723 A JP 2003071723A
Authority
JP
Japan
Prior art keywords
vitrified
grains
grindstone
aggregate
grinding
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
Application number
JP2001261657A
Other languages
Japanese (ja)
Inventor
Satoyuki Kasuga
智行 春日
Shinji Soma
伸司 相馬
Ryohei Mukai
良平 向井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyoda Koki KK
Original Assignee
Toyoda Koki KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyoda Koki KK filed Critical Toyoda Koki KK
Priority to JP2001261657A priority Critical patent/JP2003071723A/en
Publication of JP2003071723A publication Critical patent/JP2003071723A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a vitrified grinding wheel obtaining appropriate abrasive grain interval and preventing abrasive grains from coming off a grinding surface at an early stage. SOLUTION: In the vitrified grinding wheel composed of the abrasive grains 1 composed of super abrasive grains such as CBN grains or diamond grains, and bond 3 composed of vitrified bond bonding and retaining the abrasive grains 1, aggregate 2 composed of compound oxide grains composed of alumina (Al2 O3 ) and chromium oxide (Cr2 O3 ) having good affinity with vitrified bond forming the bond 3 is filled in the bond 3. Consequently, designated interval of abrasive grain is secured and bonding force among abrasive grains is enhanced to form the verified grinding wheel preventing abrasive grains from coming off at an early stage.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、立方晶窒化ホウ素
(CBN)粒またはダイヤモンド粒等の超砥粒をビトリ
ファイドボンド結合剤を用いて保持または結合するビト
リファイド砥石に関するもので、特に、前記結合剤中
に、ビトリファイドボンドと親和性の良い骨材を混ぜ合
わせ、これによって超砥粒の結合性を高めるようにした
ビトリファイド砥石に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vitrified grindstone for holding or bonding superabrasive grains such as cubic boron nitride (CBN) grains or diamond grains using a vitrified bond binder, and more particularly to the above-mentioned binder. The present invention relates to a vitrified grindstone in which a vitrified bond and an aggregate having a high affinity are mixed to thereby enhance the bondability of superabrasive grains.

【0002】[0002]

【従来の技術】一般に、立方晶窒化ホウ素(CBN)粒
またはダイヤモンド粒等の超砥粒を用いた研削砥石を使
用して、細物ワーク等の曲がり易いものを研削するに際
しては、研削抵抗を小さくくする必要がある。このよう
な曲がり易いワークの研削に使用する研削砥石として
は、通常、砥粒間隔を大きくしたものを使用している。
具体的には、図1に示す如く、超砥粒1を大きな砥粒間
隔で均等に分散させるために、結合剤3(ビトリファイ
ドボンド)中にアルミナ(Al23 )粒からなる骨材
2を混入し、このように骨材2を混入した結合剤3(ビ
トリファイドボンド)のブリッジを介して超砥粒1を大
きな砥粒間隔を有した状態で保持するようにしている。
2. Description of the Related Art Generally, when a grinding wheel using superabrasive grains such as cubic boron nitride (CBN) grains or diamond grains is used to grind a flexible work such as a fine work piece, the grinding resistance is increased. Need to be small. As a grinding wheel used for grinding such a flexible work, a grinding wheel having a large abrasive grain interval is usually used.
Specifically, as shown in FIG. 1, in order to uniformly disperse the superabrasive grains 1 with a large abrasive grain interval, an aggregate 2 made of alumina (Al 2 O 3 ) grains in a binder 3 (vitrified bond) is used. And the superabrasive grains 1 are held with a large gap between the grains via the bridge of the binder 3 (vitrified bond) in which the aggregate 2 is mixed.

【0003】[0003]

【発明が解決しようとする課題】ところで、上記した従
来の砥石のように、アルミナ(Al23 )粒子2を骨
材として上記ビトリファイドボンドの結合剤3中に混入
させるようにしたものにおいては、アルミナとビトリフ
ァイドボンド結合剤との親和性が良くないため、研削作
業中において、砥石表面から露出するアルミナ粒子から
なる骨材2は、図2で破線にて示す如く、研削抵抗の作
用を受けてビトリファイドボンド結合剤3との結合から
解離し、比較的簡単に脱落してしまう。その結果、ビト
リファイドボンド結合剤3は、上記骨材2の脱落によっ
て、砥石表面で隣接する砥粒1間同士の結合を低下させ
て超砥粒1の保持力を低下させてしまうことになり、図
2において破線で示す如き超砥粒1の早期脱落、延いて
は砥石寿命の短縮を招くと言う問題が生ずる。従って、
本発明の目的は、ビトリファイドボンド結合剤中に混入
された骨材が研削作業中においてもビトリファイドボン
ドからなる結合剤と強固に結合した状態で保持されるよ
うにしたビトリファイド砥石を提供することにある。
By the way, in the case where the alumina (Al 2 O 3 ) particles 2 are mixed as an aggregate into the binder 3 of the vitrified bond as in the above-mentioned conventional grindstone, Since the affinity between the alumina and the vitrified bond binder is not good, the aggregate 2 made of alumina particles exposed from the surface of the grindstone is subjected to the action of grinding resistance during the grinding operation as shown by the broken line in FIG. As a result, it dissociates from the bond with the vitrified bond binder 3 and falls off relatively easily. As a result, the vitrified bond binder 3 will reduce the bond between the abrasive grains 1 adjacent to each other on the surface of the grindstone due to the drop-off of the aggregate 2 and reduce the holding force of the superabrasive grains 1. As shown by the broken line in FIG. 2, there arises a problem that the superabrasive grains 1 fall off early and eventually the life of the grindstone is shortened. Therefore,
An object of the present invention is to provide a vitrified grindstone in which an aggregate mixed in a vitrified bond binder is held in a state of being strongly bonded to a binder composed of a vitrified bond even during a grinding operation. .

【0004】[0004]

【課題を解決するための手段】上記課題を解決し本発明
の目的を達成するために、請求項1記載の発明において
は、立方晶窒化ホウ素(CBN)粒またはダイヤモンド
粒からなる超砥粒を骨材が混入されたビトリファイドボ
ンド結合剤にて結合及び保持してなるビトリファイド砥
石において、前記結合剤の中に前記骨材として、アルミ
ナ(Al23)と酸化クロム(Cr23 )の複合酸
化物粒子からなる骨材を含有するようにしたことを特徴
とする。
In order to solve the above problems and to achieve the object of the present invention, in the invention of claim 1, superabrasive grains composed of cubic boron nitride (CBN) grains or diamond grains are used. In a vitrified grindstone bonded and held by a vitrified bond binder mixed with an aggregate, alumina (Al 2 O 3 ) and chromium oxide (Cr 2 O 3 ) as the aggregate in the binder are used. It is characterized by containing an aggregate composed of composite oxide particles.

【0005】このような構成を採ることにより、本発明
によるビトリファイド砥石は、次のような作用を奏す
る。すなわち、骨材として用いられるアルミナ(Al2
3 )と酸化クロム(Cr23 )の複合酸化物粒子
は、結合剤を形成するビトリファイドボンドとの親和性
が良く、砥石の焼成後ではビトリファイドボンド結合剤
と融着した状態で存在する。その結果、骨材にアルミナ
(Al23 )粒子をい用いた従来のビトリファイド砥
石に比べて、結合剤の結合力及び保持力が強固に保たれ
て砥石の研削作用表面における骨材の早期脱落が防止さ
れ、砥粒(超砥粒)の早期脱落が防止されることとな
る。
By adopting such a structure, the vitrified grindstone according to the present invention has the following effects. That is, alumina (Al 2
The composite oxide particles of O 3 ) and chromium oxide (Cr 2 O 3 ) have good affinity with the vitrified bond forming the binder, and are present in a state of being fused with the vitrified bond binder after firing of the grindstone. . As a result, as compared with the conventional vitrified grindstone using alumina (Al 2 O 3 ) particles as the aggregate, the binding force and the holding force of the binder are kept stronger, and the early stage of the aggregate on the grinding action surface of the grindstone. Falling off is prevented, and early dropping of the abrasive grains (superabrasive grains) is prevented.

【0006】また、請求項2記載の発明においては、骨
材としてのアルミナ(Al23 )と酸化クロム(Cr
23 )との複合酸化物粒子の組成を、アルミナ(Al
2 3 )が50〜90容量%の範囲内で、酸化クロム
(Cr23 )が50〜10容量%の範囲内としたこと
を特徴とする。このような組成割合のアルミナ(Al2
3 )と酸化クロム(Cr23 )の複合酸化物粒子を
用いることにより、結合剤の結合力及び砥粒(超砥粒)
の保持力を向上させることができ、砥粒(超砥粒)の早
期脱落を防止できる。
In the invention according to claim 2, the bone is
Alumina as a material (Al2 O3 ) And chromium oxide (Cr
2 O3 ) And the composition of the composite oxide particles with alumina (Al
2 O 3 ) In the range of 50 to 90% by volume, chromium oxide
(Cr2 O3 ) Was in the range of 50 to 10% by volume.
Is characterized by. Alumina (Al2
O3 ) And chromium oxide (Cr2 O3 ) Composite oxide particles
By using, the binding force of the binder and abrasive grains (superabrasive grains)
Can improve the holding power of the
It is possible to prevent falling out.

【0007】上記した請求項1又は2に記載の構成を採
ることにより、本発明によれば、結合剤の結合力の強化
が図られ、砥粒保持力の強いビトリファイド砥石が形成
されることとなり、このような砥石を用いて研削加工を
行うときは、効率の良い、つまり高能率で低ツールコス
トの研削作業が進められることとなる。
According to the present invention, by virtue of adopting the above-mentioned structure according to claim 1 or 2, it is possible to enhance the binding force of the binder and form a vitrified grindstone having a strong abrasive grain holding force. When carrying out a grinding process using such a grindstone, the grinding work with high efficiency, that is, high efficiency and low tool cost can be carried out.

【0008】[0008]

【発明の実施の形態】以下、本発明の実施の形態につい
て、図1及び図2を参照して説明する。本発明の実施の
形態に関わるビトリファイド砥石の幾何学的形状は、従
来のように、金属製又は繊維強化複合材料製の円盤状基
板の外周に複数の砥石セグメントを接着して環状の砥粒
層を形成した例えば円筒或いは平面研削盤等で使用する
セグメント形のものである。勿論、砥石の他の幾何学的
形状としては、通常砥石のように、円盤状或いは環状の
砥粒層を直接成形して焼成する1ピース形の形態のもの
でもよい。上記したセグメント形砥石(或いは1ピース
形砥石)における砥粒層の構成は、図1に示す如く、立
方晶窒化ホウ素(CBN)粒またはダイヤモンド粒等の
超砥粒からなる砥粒1と、隣接する砥粒1同士をブリッ
ジ結合して保持するビトリファイドボンドからなる結合
剤3と、この結合剤3中に混入して充填されかつビトリ
ファイドボンド結合剤との親和性の良い性状を有する骨
材2と、隣接する砥粒1を結合する結合剤3のブリッジ
間に形成される気孔4とからなる。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. Geometrical shape of the vitrified grindstone according to the embodiment of the present invention, as in the conventional case, a plurality of grindstone segments are bonded to the outer periphery of a disk-shaped substrate made of metal or fiber reinforced composite material to form an annular abrasive grain layer. It is a segment type for use in, for example, a cylinder or a surface grinder. Of course, another geometric shape of the grindstone may be a one-piece shape in which a disc-shaped or ring-shaped abrasive grain layer is directly formed and fired like a normal grindstone. As shown in FIG. 1, the structure of the abrasive grain layer in the segment type grindstone (or the one-piece type grindstone) is, as shown in FIG. 1, adjacent to the abrasive grain 1 made of superabrasive grains such as cubic boron nitride (CBN) grains or diamond grains. A binder 3 composed of vitrified bonds for holding the abrasive grains 1 in a bridge-bonding relationship with each other, and an aggregate 2 mixed and filled in the binder 3 and having a good affinity with the vitrified bond binder. , And pores 4 formed between the bridges of the binder 3 that bond the adjacent abrasive grains 1.

【0009】本実施の形態において結合剤3中に混入し
て存在する骨材2としては、結合剤と親和性の良い複合
酸化物粒子であり、この複合酸化物粒子の代表例として
アルミナ(Al23 )と酸化クロム(Cr23 )の
複合酸化物粒子が採用される。そして、本実施の形態に
おける超砥粒砥石の製造に際しては、前述した砥粒(超
砥粒)1と、結合剤3を形成するビトリファイドボンド
と、このビトリファイドボンドとの親和性に優れた性状
を有するアルミナ(Al23 )と酸化クロム(Cr2
3 )の複合酸化物粒子からなる骨材2とを混合し、こ
の混合物を複数のセグメント砥石型(或いは、1ピース
形砥石の場合は、円盤或いは環状空間を呈する成形型)
に型込め加圧成形した状態で所定の温度にて焼成する。
焼成・冷却後、複数の砥石セグメントを公知の基板外周
に適宜接着剤にて接着する。これにより、基板外周に接
着された複数の砥石セグメントからなる環状の砥粒層に
おいて図1に示すような所定の砥粒間隔及び気孔4を有
するビトリファイド砥石が形成される。なお、超砥粒
1、ビトリファイドボンド結合剤3及び骨材2の配合割
合、型込めにおける成形加圧力、焼成温度及び焼成時間
は、従来の一般的超砥粒の製造におけるものと実質的に
同一である。
In this embodiment, the aggregate 2 mixed and present in the binder 3 is a composite oxide particle having a good affinity with the binder, and a typical example of the composite oxide particle is alumina (Al). 2 O 3 ) and chromium oxide (Cr 2 O 3 ) composite oxide particles are adopted. Then, when manufacturing the superabrasive grain grindstone in the present embodiment, the above-mentioned abrasive grains (superabrasive grains) 1, the vitrified bond forming the binder 3, and the properties excellent in affinity with the vitrified bond are described. Alumina (Al 2 O 3 ) and chromium oxide (Cr 2
O 3 ) Aggregate 2 composed of composite oxide particles is mixed, and this mixture is divided into a plurality of segment grindstones (or, in the case of a one-piece grindstone, a molding die having a disk or annular space).
Baking is performed at a predetermined temperature in a state of being pressed and molded.
After firing and cooling, a plurality of grindstone segments are appropriately adhered to the outer circumference of a known substrate with an adhesive. As a result, a vitrified grindstone having a predetermined gap between the grindstones and pores 4 as shown in FIG. 1 is formed in the annular grindstone layer composed of a plurality of grindstone segments adhered to the outer periphery of the substrate. The mixing ratio of the superabrasive grains 1, the vitrified bond binder 3 and the aggregate 2, the molding pressure in the molding, the firing temperature and the firing time are substantially the same as those in the production of conventional general superabrasive grains. Is.

【0010】次に、このようにして製造される本実施の
形態のビトリファイド砥石の研削作業における作用につ
いて説明する。骨材2として用いられるアルミナ(Al
2 3 )と酸化クロム(Cr23 )の複合酸化物粒子
は、結合剤3を形成するビトリファイドボンドとの親和
性が良いため、焼成後においてはビトリファイドボンド
と良く融着した状態で結合剤3中に存在するようにな
る。その結果、骨材2にアルミナ(Al23 )粒子を
用いた従来のビトリファイド砥石と比べて、複合酸化物
粒子からなる骨材2はビトリファイドボンド3と強固に
一体化して同ボンド3中に保持され、研削抵抗の作用下
においてもボンド3と解離しにくくなり、図2において
破線で示す従来のビトリファイド砥石の研削表面におけ
る骨材2のように早期に脱落されることから防止され
る。その結果、超砥粒1間の間隔及び砥粒1同士の結合
力が強固に保たれ、砥粒1の早期脱落が防止されること
となる。
Next, the present embodiment manufactured in this way is
Of action in grinding work of vitrified grindstone of various shapes
And explain. Alumina used as aggregate 2 (Al
2 O 3 ) And chromium oxide (Cr2 O3 ) Composite oxide particles
Is an affinity with the vitrified bond forming the binder 3.
Since it has good properties, it is a vitrified bond after firing.
So as to exist in the binder 3 in a well fused state.
It As a result, alumina (Al2 O3 ) Particles
Compared to the conventional vitrified grindstone used, complex oxide
Aggregate 2 made of particles is firmly bonded to vitrified bond 3
Integrated and held in the same bond 3, under the action of grinding resistance
Also becomes difficult to dissociate from the bond 3 in FIG.
On the grinding surface of the conventional vitrified wheel indicated by the broken line
It is prevented from falling off early like aggregate 2
It As a result, the spacing between the superabrasive grains 1 and the bonding of the abrasive grains 1 to each other
The force is kept strong and the abrasive grain 1 is prevented from falling off early.
Becomes

【0011】また、骨材2として用いられる複合酸化物
粒子を構成するアルミナ(Al2 3 )と酸化クロム
(Cr23 )との組成比を種々変えた複合酸化物粒子
を複数種用意し、ビトリファイドCBN砥石セグメント
を製作し、強度試験を行った。この強度試験の結果、ア
ルミナ(Al23 )粒子を用いた従来のものに比べ
て、容量比で50〜90%の範囲のアルミナ(Al2
3 )と同じく容量比で50〜10%の範囲の酸化クロム
(Cr23 )との組成割合とした複合酸化物粒子を使
用した場合に、ビトリファイドCBN砥石の強度が高い
値を示した。従って、アルミナ(Al23 )50〜9
0容量%と酸化クロム(Cr23 )50〜10容量%
を組成とする複合酸化物粒子は、ビトリファイドボンド
との親和性良く、この組成割合の複合酸化物粒子を骨材
2としてビトリファイドボンドに混入した砥石では、砥
粒1(超砥粒)は強固に保持されることとなり、砥粒1
(超砥粒)の早期脱落等が防止されることが判った。
A composite oxide used as the aggregate 2
Alumina (Al2 O 3 ) And chromium oxide
(Cr2 O3 ) Composite oxide particles with various composition ratios
Prepare multiple types of vitrified CBN grindstone segment
Was manufactured and a strength test was performed. As a result of this strength test,
Lumina (Al2 O3 ) Compared to the conventional one using particles
And the volume ratio of alumina is 50 to 90% (Al2 O
3 ) Chromium oxide in the range of 50 to 10% by volume
(Cr2 O3 ) The composition ratio of
The strength of the vitrified CBN grindstone is high when used
Showed the value. Therefore, alumina (Al2 O3 ) 50-9
0% by volume and chromium oxide (Cr2 O3 ) 50-10% by volume
Is a vitrified bond.
The composite oxide particles with this composition ratio have good affinity with
With the grindstone mixed in the vitrified bond as 2,
Grain 1 (superabrasive grain) is firmly held, and abrasive grain 1
It was found that the (superabrasive grains) were prevented from falling off early.

【0012】[0012]

【実施例】骨材2として、アルミナ(Al23 )と酸
化クロム(Cr23 )の複合酸化物粒子を用い、下記
配合の砥石原料の混合物を複数の砥石セグメントにプレ
ス成形した後に焼成し、厚さ3mmの砥粒層を持つ外径φ
350mmのビトリファイドCBN砥石を製造した。
[Example] As the aggregate 2, composite oxide particles of alumina (Al 2 O 3 ) and chromium oxide (Cr 2 O 3 ) were used. Outer diameter φ with 3mm thick abrasive grain layer after firing
A 350 mm vitrified CBN grindstone was produced.

【0013】〈実施例の砥石原料とその配合(固体原料
の合計容積部を100とする)〉 CBN砥粒(#120/140) 56.8容積部 アルミナ、酸化クロム複合酸化物 19容積部 ビトリファイド結合剤 24.2容積部
<Grinding stone raw material of the example and its mixture (total volume of solid raw material is 100)> CBN abrasive grains (# 120/140) 56.8 parts by volume Alumina, chromium oxide complex oxide 19 parts by volume Vitrified Binder 24.2 parts by volume

【0014】[0014]

【比較例】実施例と同様にして、アルミナ(Al2
3 )を骨材2とする下記配合の砥石原料のビトリファイ
ドCBN砥石を製造した。 〈比較例の砥石原料とその配合〉 CBN砥粒(#120/140) 56.8容積部 アルミナ 19容積部 ビトリファイド結合剤 24.2容積部
Comparative Example Alumina (Al 2 O
A vitrified CBN grindstone, which is a raw material for the grindstone and has the following composition, having 3 ) as the aggregate 2 was manufactured. <Grinding stone raw material of comparative example and its blend> CBN abrasive grains (# 120/140) 56.8 parts by volume Alumina 19 parts by volume Vitrified binder 24.2 parts by volume

【0015】実施例及び比較例のそれぞれの砥石にて円
筒プランジ研削を行い、研削時の消費動力、研削比、加
工物の表面粗さについて調査した。その結果として、表
1に研削時の消費動力及び研削比を示し、図3に加工物
の研削量と表面粗さの変化を示す。表1の研削時の消費
動力、研削比の結果は、比較例を100とした場合の相
対的な値である。
Cylindrical plunge grinding was performed with each of the grindstones of Examples and Comparative Examples, and the power consumption during grinding, the grinding ratio, and the surface roughness of the workpiece were investigated. As a result, Table 1 shows the power consumption and the grinding ratio during grinding, and FIG. 3 shows the changes in the grinding amount and surface roughness of the workpiece. The results of the power consumption during grinding and the grinding ratio in Table 1 are relative values when the comparative example is 100.

【0016】[0016]

【表1】研削試験結果 [Table 1] Results of grinding test

【0017】なお、上記円筒プランジ研削試験における
研削条件及びツルーイング条件は下記の通りであった。 〈研削条件〉 使用機械:円筒研削盤 研削方式:円筒プランジ研削方式 砥石周速度:50m/s 加工物:クロム鋼 浸炭焼入れ(φ53mm 幅4m
m) 研削液:水溶性研削油剤 〈ツルーイング条件〉 ツルア:ダイヤモンドロータリードレッサ 切込量:φ4μm
The grinding conditions and truing conditions in the above cylindrical plunge grinding test were as follows. <Grinding conditions> Machine used: Cylindrical grinder Grinding method: Cylindrical plunge grinding method Grinding wheel peripheral speed: 50 m / s Workpiece: Chrome steel Carburizing and quenching (φ53 mm, width 4 m
m) Grinding fluid: Water-soluble grinding fluid <Truing conditions> Truer: Diamond rotary dresser Depth of cut: φ4 μm

【0018】表1に示すように、実施例の砥石は比較例
の砥石に比べて、消費動力は同等にもかかわらず、研削
比は1.6倍と高く、1回の砥石ツルーイングによる金
属除去能力が向上した。また、図3に示すように、実施
例の砥石は、比較例の砥石が加工済み製品としての実用
限界表面粗さ3μmRzに到達する研削量を超える大き
な研削量の領域においても前記実用限界表面粗さ以下の
表面粗さを維持して加工物の研削を続行できた。なお、
研削比が高いということは、砥石の寿命が長いというこ
とを意味している。つまり、本実施例の砥石は、従来品
と同等の消費動力において、砥石寿命が長く加工物の表
面粗さの保持性が良いということが判った。
As shown in Table 1, the grindstone of the embodiment has a grinding ratio of 1.6 times higher than that of the grindstone of the comparative example even though the power consumption is the same. Ability improved. In addition, as shown in FIG. 3, the grindstone of the example has a practical limit surface roughness even in a region of a large grinding amount that exceeds the grinding amount at which the grindstone of the comparative example reaches a practical limit surface roughness of 3 μmRz as a processed product. It was possible to continue grinding of the work piece while maintaining the surface roughness below that. In addition,
A high grinding ratio means that the life of the grindstone is long. In other words, it was found that the grindstone of this example has a long grindstone life and a good retention of the surface roughness of the workpiece under the same power consumption as the conventional product.

【0019】[0019]

【発明の効果】本発明によれば、立方晶窒化ホウ素(C
BN)粒またはダイヤモンド粒からなる超砥粒と、該超
砥粒を結合及び保持するビトリファイドボンドからなる
結合剤とからなるビトリファイド砥石において、結合剤
の中に混入される骨材として結合剤と親和性のあるアル
ミナ(Al23 )と酸化クロム(Cr23 )の複合
酸化物粒子を用いることで、砥粒の早期脱落等を防止す
ることができる。従って、ドレスインターバル間の研削
量が増加して砥石寿命が延長され、ツールコストが低減
されると云った効果が奏せられる。
According to the present invention, cubic boron nitride (C
In a vitrified grindstone composed of a super abrasive grain composed of BN) grains or diamond grains and a binder composed of a vitrified bond that binds and holds the super abrasive grain, an affinity with the binder as an aggregate mixed in the binder By using composite oxide particles of alumina (Al 2 O 3 ) and chromium oxide (Cr 2 O 3 ) which have properties, it is possible to prevent the abrasive grains from falling off early. Therefore, the grinding amount during the dressing interval is increased, the life of the grindstone is extended, and the tool cost is reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】従来及び本発明によるビトリファイド砥石の砥
粒層の組織構成を説明するために砥粒層の一部を拡大し
て示す拡大断面図である。
FIG. 1 is an enlarged cross-sectional view showing a part of an abrasive grain layer in an enlarged manner in order to explain a structural constitution of an abrasive grain layer of a vitrified grindstone according to the related art and the present invention.

【図2】従来及び本発明によるビトリファイド砥石の研
削表面に存在する砥粒及び骨材の研削作業時の挙動を説
明する説明図である。
FIG. 2 is an explanatory view for explaining the behavior of the abrasive grains and the aggregate present on the ground surface of the vitrified grindstone according to the prior art and the present invention during the grinding operation.

【図3】比較例と本発明品の研削試験時の加工物表面粗
さの推移を表すグラフである。
FIG. 3 is a graph showing changes in surface roughness of a workpiece during a grinding test of a comparative example and a product of the present invention.

【符号の説明】[Explanation of symbols]

1 砥粒(超砥粒) 2 骨材 3 結合剤 4 気孔 1 Abrasive grain (super abrasive grain) 2 aggregate 3 binder 4 pores

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 3C063 AA02 AB03 BA03 BB02 BC05 BD01 FF22 FF23    ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3C063 AA02 AB03 BA03 BB02 BC05                       BD01 FF22 FF23

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 立方晶窒化ホウ素(CBN)粒またはダ
イヤモンド粒からなる超砥粒を骨材が混入されたビトリ
ファイドボンド結合剤により結合及び保持してなるビト
リファイド砥石において、前記結合剤の中に前記骨材と
して、アルミナ(Al23 )と酸化クロム(Cr2
3 )の複合酸化物粒子からなる骨材が含有されているこ
とを特徴とするビトリファイド砥石。
1. A vitrified grindstone in which superabrasive grains composed of cubic boron nitride (CBN) grains or diamond grains are bonded and held by a vitrified bond binder mixed with an aggregate. As an aggregate, alumina (Al 2 O 3 ) and chromium oxide (Cr 2 O)
A vitrified grindstone containing an aggregate composed of 3 ) composite oxide particles.
【請求項2】 請求項1記載のビトリファイド砥石にお
いて、前記骨材としてのアルミナ(Al23 )と酸化
クロム(Cr23 )の複合酸化物粒子の組成は、アル
ミナ(Al23 )が50〜90容量%の範囲内で、酸
化クロム(Cr23 )が50〜10容量%の範囲内で
あることを特徴とするビトリファイド砥石。
2. A vitrified grinding wheel of claim 1 wherein, the composition of the composite oxide particles of alumina (Al 2 O 3) and chromium oxide (Cr 2 O 3) as the aggregate of alumina (Al 2 O 3 ) Is in the range of 50 to 90% by volume, and chromium oxide (Cr 2 O 3 ) is in the range of 50 to 10% by volume.
JP2001261657A 2001-08-30 2001-08-30 Vitrified grinding wheel Pending JP2003071723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001261657A JP2003071723A (en) 2001-08-30 2001-08-30 Vitrified grinding wheel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001261657A JP2003071723A (en) 2001-08-30 2001-08-30 Vitrified grinding wheel

Publications (1)

Publication Number Publication Date
JP2003071723A true JP2003071723A (en) 2003-03-12

Family

ID=19088668

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001261657A Pending JP2003071723A (en) 2001-08-30 2001-08-30 Vitrified grinding wheel

Country Status (1)

Country Link
JP (1) JP2003071723A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007030110A (en) * 2005-07-28 2007-02-08 Honda Motor Co Ltd Vitrified grinding stone and its manufacturing method, and method for grinding cast iron workpiece using the same grinding tool
CN101870091A (en) * 2010-06-17 2010-10-27 大连理工大学 Method for preparing ultra-fine diamond grinding wheel of vitrified bond
CN105818007A (en) * 2015-01-27 2016-08-03 株式会社捷太格特 Grinding wheel and method for manufacturing the same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007030110A (en) * 2005-07-28 2007-02-08 Honda Motor Co Ltd Vitrified grinding stone and its manufacturing method, and method for grinding cast iron workpiece using the same grinding tool
JP4562609B2 (en) * 2005-07-28 2010-10-13 本田技研工業株式会社 Vitrified grinding wheel, method of manufacturing the same, and cast iron workpiece grinding method using the same
CN101870091A (en) * 2010-06-17 2010-10-27 大连理工大学 Method for preparing ultra-fine diamond grinding wheel of vitrified bond
CN105818007A (en) * 2015-01-27 2016-08-03 株式会社捷太格特 Grinding wheel and method for manufacturing the same
JP2016137536A (en) * 2015-01-27 2016-08-04 株式会社ジェイテクト Abrasive wheel and manufacturing method thereof
CN105818007B (en) * 2015-01-27 2019-08-27 株式会社捷太格特 Grinding wheel and its manufacturing method

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