JP4454344B2 - Vitrified grinding wheel - Google Patents
Vitrified grinding wheel Download PDFInfo
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- JP4454344B2 JP4454344B2 JP2004065733A JP2004065733A JP4454344B2 JP 4454344 B2 JP4454344 B2 JP 4454344B2 JP 2004065733 A JP2004065733 A JP 2004065733A JP 2004065733 A JP2004065733 A JP 2004065733A JP 4454344 B2 JP4454344 B2 JP 4454344B2
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- single crystal
- alumina abrasive
- crystal alumina
- abrasive grain
- abrasive grains
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- 239000006061 abrasive grain Substances 0.000 claims description 105
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 57
- 239000013078 crystal Substances 0.000 claims description 52
- 239000000203 mixture Substances 0.000 claims description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000012764 semi-quantitative analysis Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Polishing Bodies And Polishing Tools (AREA)
Description
本発明は、ビトリファイド砥石に関するものであり、特に特性の異なる異種の砥粒を混合使用することで研削性能の向上を企図したビトリファイド砥石に関するものである。 The present invention relates to a vitrified whetstone, and more particularly to a vitrified whetstone intended to improve grinding performance by mixing different types of abrasive grains having different characteristics.
鉄鋼などの金属からなる部材の研削とくにその表面の研削または研磨のための工具として、ビトリファイド砥石が広く使用されている。このビトリファイド砥石は、アルミナ等の砥粒をガラス質のビトリファイド結合材により結合して、該結合材により多数の砥粒を分散して保持したものである。ビトリファイド砥石の研削性能を決定する要因は数多くあるが砥粒自体の機械的特性がその大きなウェイトを占めている。従って、特定の砥粒のみを使用するよりも、特性の異なる複数種類の砥粒を混合して使用することが研削性能の向上に役立つ場合がある。 Vitrified grinding wheels are widely used as tools for grinding members made of metal such as steel, especially for grinding or polishing the surface thereof. This vitrified grindstone is formed by bonding abrasive grains such as alumina with a vitreous vitrified binder, and dispersing and holding a large number of abrasive grains with the binder. There are many factors that determine the grinding performance of vitrified wheels, but the mechanical properties of the abrasive grains themselves occupy a large weight. Therefore, it is sometimes useful to improve the grinding performance by using a mixture of a plurality of types of abrasive grains having different characteristics rather than using only specific abrasive grains.
砥粒としてアルミナ砥粒を用いたビトリファイド砥石において、結合材中に複数種類の砥粒を分散保持して研削性能の向上を目指したものとして、例えば、特開２００１−３８６３３号公報（特許文献１）に、褐色アルミナ砥粒と解砕型アルミナ砥粒とを所定割合で混合してなるビトリファイド砥石が開示されている。このビトリファイド砥石によれば、研削比及びドレス間隔の改善がなされる。 In a vitrified grindstone using alumina abrasive grains as abrasive grains, for example, JP 2001-38633 A (Patent Document 1) is intended to improve grinding performance by dispersing and holding a plurality of types of abrasive grains in a binder. ) Discloses a vitrified grindstone obtained by mixing brown alumina abrasive grains and pulverized alumina abrasive grains at a predetermined ratio. According to this vitrified grindstone, the grinding ratio and dress interval are improved.
しかるに、近年、ビトリファイド砥石の研削性能の更なる向上が要望されている。
そこで、本発明は、更なる研削性能の向上を可能となすべく特性の異なる異種の砥粒を混合使用する新規構成のビトリファイド砥石を提供することを目的とするものである。 Therefore, an object of the present invention is to provide a vitrified grindstone having a novel configuration in which different types of abrasive grains having different characteristics are mixed and used so as to further improve grinding performance.
本発明によれば、以上の如き目的を達成するものとして、
第１の単結晶アルミナ砥粒と該第１の単結晶アルミナ砥粒より強度が低く且つ靱性が高い第２の単結晶アルミナ砥粒とを体積比で前記第１の単結晶アルミナ砥粒対前記第２の単結晶アルミナ砥粒が７０：３０〜９７：３となるように含み、
前記第１の単結晶アルミナ砥粒はその化学組成（酸化物換算）において９９．５質量％以上のＡｌ ２ Ｏ ３ を含み、前記第２の単結晶アルミナ砥粒はその化学組成（酸化物換算）において０．１質量％以上のＴｉＯ ２ 及び１質量％以上のＳＯ ３ を含むことを特徴とするビトリファイド砥石、
が提供される。
According to the present invention, the object as described above is achieved.
The first single crystal alumina abrasive grains and the second single crystal alumina abrasive grains having a lower strength and higher toughness than the first single crystal alumina abrasive grains in a volume ratio. Including the second single crystal alumina abrasive grains to be 70:30 to 97: 3 ,
The first single crystal alumina abrasive grain contains 99.5% by mass or more of Al 2 O 3 in its chemical composition (as oxide), and the second single crystal alumina abrasive grain has its chemical composition (as oxide). ) Containing 0.1% by mass or more of TiO 2 and 1% by mass or more of SO 3 ,
Is provided.
本発明の一態様においては、前記ビトリファイド砥石は、前記第１の単結晶アルミナ砥粒と前記第２の単結晶アルミナ砥粒とを体積比７５：２５〜９５：５で含む。 In one aspect of the present invention, the vitrified grindstone includes the first single crystal alumina abrasive grains and the second single crystal alumina abrasive grains in a volume ratio of 75:25 to 95: 5.
本発明の一態様においては、前記強度は平均圧壊荷重によるものであり、前記第１の単結晶アルミナ砥粒は前記第２の単結晶アルミナ砥粒より平均圧壊荷重が大きい。本発明の一態様においては、前記強度は引張破壊応力によるものであり、前記第１の単結晶アルミナ砥粒は前記第２の単結晶アルミナ砥粒より引張破壊応力が大きい。本発明の一態様においては、前記靱性は破砕性指数によるものであり、前記第１の単結晶アルミナ砥粒は前記第２の単結晶アルミナ砥粒より破砕性指数が大きい。 In one aspect of the present invention, the strength is due to an average crushing load, and the first single crystal alumina abrasive grain has a larger average crushing load than the second single crystal alumina abrasive grain. In one aspect of the present invention, the strength is due to tensile fracture stress, and the first single crystal alumina abrasive grains have a greater tensile fracture stress than the second single crystal alumina abrasive grains. In one aspect of the present invention, the toughness is based on a friability index, and the first single crystal alumina abrasive grain has a friability index greater than that of the second single crystal alumina abrasive grain.
本発明の一態様においては、前記第１の単結晶アルミナ砥粒は、アルミナ結晶を機械的に解砕して得られたものである。本発明の一態様においては、前記第２の単結晶アルミナ砥粒は、アルミナ結晶をその粒界介在物を溶解することで解砕して得られたものである。 In one aspect of the present invention, the first single crystal alumina abrasive grains are obtained by mechanically crushing alumina crystals. In one aspect of the present invention, the second single crystal alumina abrasive grains are obtained by crushing alumina crystals by dissolving the grain boundary inclusions.
本発明によれば、ビトリファイド砥石において砥粒として単結晶アルミナ砥粒のみを用い、但し該単結晶アルミナ砥粒として強度及び靱性の異なる第１及び第２のものを混合使用することで、研削性能を著しく高めることが可能となる。 According to the present invention, in the vitrified grindstone, only single crystal alumina abrasive grains are used as the abrasive grains. However, the first and second grains having different strengths and toughnesses are mixed and used as the single crystal alumina abrasive grains. Can be significantly increased.
以下、本発明の実施の形態を説明する。 Embodiments of the present invention will be described below.
本発明において、第２の単結晶アルミナ砥粒として例示される「砥粒Ａ」は、その製造に際し硫化物を含んだアルミナ溶湯をゆっくりと冷却してアルミナ結晶を成長させる。その際、硫化物は粒界に偏析しており、この硫化物を溶かすことで結晶を解砕して単結晶砥粒を得る。このように、第２の単結晶アルミナ砥粒である「砥粒Ａ」は、その製造過程において機械的な応力をかけていないという特徴がある。 In the present invention, the “abrasive grain A” exemplified as the second single crystal alumina abrasive grains slowly cools the molten alumina containing sulfide during the production thereof to grow alumina crystals. At that time, the sulfides are segregated at the grain boundaries, and the crystals are crushed by dissolving the sulfides to obtain single crystal abrasive grains. Thus, “abrasive grain A” which is the second single crystal alumina abrasive grain is characterized in that no mechanical stress is applied in the manufacturing process.
これに対して、第１の単結晶アルミナ砥粒として例示される「砥粒Ｂ」は、その製造に際し硫化物を使用することなくアルミナ結晶を成長させ、その後機械的に解砕して単結晶砥粒を得る。このように、第１の単結晶アルミナ砥粒である「砥粒Ｂ」は、その製造過程において硫化物を使用していないため、「砥粒Ａ」に比べて不純物が少ないという特徴がある。 On the other hand, the “abrasive grain B” exemplified as the first single crystal alumina abrasive grains grows alumina crystals without using sulfide during the production, and then mechanically disintegrates the single crystals. Get abrasive. As described above, the “abrasive grain B” which is the first single crystal alumina abrasive grain is characterized in that it contains fewer impurities than the “abrasive grain A” because no sulfide is used in the manufacturing process.
この２種類の砥粒（いずれも＃３６）の形状及び表面状態をＳＥＭ（ＪＥＯＬ社製ＪＳＭ−５３００［商品名］）により観察したところ、「砥粒Ａ」より「砥粒Ｂ」の方が尖った形状をなしており角が鋭角であった。表面状態については、「砥粒Ａ」の表面は凹凸が目立つのに対して、「砥粒Ｂ」の表面は平滑であった。これは製造方法の相違をよく反映しているものと考えられる。この表面状態は、ビトリファイド結合材と結合する際の結合面積に関係するため、砥粒の保持力に影響し、その結果、砥石の研削性能に大きな影響があるものと推測される。 When the shape and surface state of these two types of abrasive grains (both # 36) were observed with SEM (JSM-5300 [trade name] manufactured by JEOL), “abrasive grain B” was more than “abrasive grain A”. It had a sharp shape and an acute angle. Regarding the surface state, the surface of the “abrasive grain A” was conspicuous, while the surface of the “abrasive grain B” was smooth. This is considered to reflect the difference in the manufacturing method well. Since this surface state is related to the bonding area at the time of bonding with the vitrified bonding material, it influences the holding power of the abrasive grains, and as a result, it is assumed that the grinding performance of the grindstone is greatly affected.
以上の２種類の砥粒の化学組成につき分析を行った。分析は、砥粒を粉砕して粉末状にした後に、蛍光Ｘ線の半定量分析により測定した。以下の結果が得られた：
「砥粒Ａ」（第２の単結晶アルミナ砥粒）
Ａｌ２Ｏ３：９７．４１質量％
ＴｉＯ２：０．３５質量％
ＳｉＯ２：０．２９質量％
ＣａＯ：０．０２質量％
Ｆｅ２Ｏ３：０．０３質量％
ＳＯ３：１．８７質量％
「砥粒Ｂ」（第１の単結晶アルミナ砥粒）
Ａｌ２Ｏ３：９９．７１質量％
ＳｉＯ２：０．０５質量％
Ｎａ２Ｏ：０．２１質量％
ＣａＯ：０．０１質量％
Ｆｅ２Ｏ３：０．０２質量％
尚、測定結果は酸化物に換算して示している。
The chemical composition of the above two types of abrasive grains was analyzed. Analysis was performed by semi-quantitative analysis of fluorescent X-rays after grinding the abrasive grains into powder. The following results were obtained:
"Abrasive grain A" (second single crystal alumina abrasive grain)
Al 2 O 3 : 97.41% by mass
TiO 2 : 0.35% by mass
SiO 2 : 0.29% by mass
CaO: 0.02 mass %
Fe 2 O 3 : 0.03 mass %
SO 3 : 1.87% by mass
"Abrasive grain B" (first single crystal alumina abrasive grain)
Al 2 O 3 : 99.71% by mass
SiO 2 : 0.05% by mass
Na 2 O: 0.21% by mass
CaO: 0.01% by mass
Fe 2 O 3 : 0.02% by mass
The measurement results are shown in terms of oxides.
以上の２種類の砥粒の化学組成には、製造方法の相違が反映されている。即ち、「砥粒Ａ」では解砕のために添加した硫化物に起因する硫黄が多く（ＳＯ３換算で１質量％以上）含まれている。これに対して、「砥粒Ｂ」には不純物が殆ど入っていない（Ａｌ２Ｏ３９９．５質量％以上）。また、「砥粒Ａ」には、ＴｉＯ２やＳｉＯ２が比較的多く含まれている（ＴｉＯ２０．１質量％以上）。アルミナ中にＴｉＯ２等が固溶すると破壊靱性が向上するため、「砥粒Ａ」は「砥粒Ｂ」より破壊靱性が高く従って強靱な砥粒である。 Differences in manufacturing methods are reflected in the chemical composition of the above two types of abrasive grains. That is, “abrasive grain A” contains a large amount of sulfur (1% by mass or more in terms of SO 3 ) due to sulfide added for crushing. On the other hand, the “abrasive grain B” is almost free of impurities (Al 2 O 3 99.5% by mass or more). Further, the “abrasive grain A” contains a relatively large amount of TiO 2 or SiO 2 (0.1% by mass or more of TiO 2 ). When TiO 2 or the like is dissolved in alumina, the fracture toughness is improved. Therefore, the “abrasive grain A” has a higher fracture toughness than the “abrasive grain B” and is therefore a tough abrasive grain.
次に、以上の２種類の砥粒の機械的性質を評価するため、平均圧壊加重Ｗを測定した。また、ＳＥＭ像から砥粒の平均投影断面積Ａを測定し、引張破壊応力σを式σ＝Ｗ／（０．３２Ａ）により算出した。 Next, in order to evaluate the mechanical properties of the above two types of abrasive grains, the average crushing load W was measured. Further, the average projected cross-sectional area A of the abrasive grains was measured from the SEM image, and the tensile fracture stress σ was calculated by the formula σ = W / (0.32A).
更に、研削時の砥粒の破砕性を評価するため、ＪＩＳ−Ｒ６１２８（人造研削剤のじん性の試験法）に準拠して以上の２種類の砥粒の破砕性指数を測定した。破砕性指数は研削時における砥粒の破砕の程度を表しており、数値が大きいほど破砕性が高い。尚、測定した砥粒は、上記引張破壊応力などの測定に用いた＃３６と後述の研削実施例で使用した＃８０の２種類の粒度のものである。 Furthermore, in order to evaluate the friability of abrasive grains during grinding, the friability index of the above two types of abrasive grains was measured in accordance with JIS-R6128 (testing method for toughness of artificial abrasive). The crushability index represents the degree of crushing of abrasive grains during grinding, and the larger the value, the higher the crushability. The measured abrasive grains are of two types, # 36 used for measuring the tensile fracture stress and the like, and # 80 used in the grinding examples described later.
以上により得られた平均圧壊加重Ｗ、平均投影断面積Ａ、引張破壊応力σ、及び破砕性指数は、次の通りであった：
「砥粒Ａ」（第２の単結晶アルミナ砥粒）
平均圧壊加重Ｗ：３６Ｎ（＃３６）
平均投影断面積Ａ：３．３×１０−７ｍ２
引張破壊応力σ：０．２５ＧＰａ（＃３６）
破砕性指数：７０．９（＃３６），５３．６（＃８０）
「砥粒Ｂ」（第１の単結晶アルミナ砥粒）
平均圧壊加重Ｗ：４３Ｎ（＃３６）
平均投影断面積Ａ：３．３×１０−７ｍ２
引張破壊応力σ：０．３３ＧＰａ（＃３６）
破砕性指数：７８．４（＃３６），６２．６（＃８０）
これらの結果から、「砥粒Ａ」は「砥粒Ｂ」に比べて強度は低いが靱性が高い強靱な砥粒であり、「砥粒Ｂ」は「砥粒Ａ」に比べて強度は高いが靱性が低く破砕しやすい砥粒である。そのため、実際の研削において、それぞれの砥粒が切れ刃として作用する場合、「砥粒Ａ」は逃げ面がすり減り平坦化されていく摩滅的摩耗形態をとり、「砥粒Ｂ」は一部分が欠落する破砕的摩耗形態をとるものと推測される。
The average crush load W, the average projected cross section A, the tensile fracture stress σ, and the friability index obtained as above were as follows:
"Abrasive grain A" (second single crystal alumina abrasive grain)
Average crush weight W: 36N (# 36)
Average projected cross section A: 3.3 × 10 −7 m 2
Tensile fracture stress σ: 0.25 GPa (# 36)
Crushability index: 70.9 (# 36), 53.6 (# 80)
"Abrasive grain B" (first single crystal alumina abrasive grain)
Average crush weight W: 43N (# 36)
Average projected cross section A: 3.3 × 10 −7 m 2
Tensile fracture stress σ: 0.33 GPa (# 36)
Crushability index: 78.4 (# 36), 62.6 (# 80)
From these results, “abrasive grain A” is a tough abrasive grain having lower strength but higher toughness than “abrasive grain B”, and “abrasive grain B” has higher strength than “abrasive grain A”. However, the abrasive grains have low toughness and are easy to crush. Therefore, in actual grinding, when each abrasive grain acts as a cutting edge, “abrasive grain A” takes a worn-out form in which the flank is worn and flattened, and “abrasive grain B” is partially missing. It is assumed that it takes a crushing wear form.
本発明のビトリファイド砥石は、例えばＳＵＪ、ＳＫＤ、ＳＫＨ、ＳＣＭ、ＳＣ、ＳＵＳ等の鋼材の研削に好適である。 The vitrified grindstone of the present invention is suitable for grinding steel materials such as SUJ, SKD, SKH, SCM, SC, and SUS.
以下、実施例及び比較例により、本発明を更に説明する。以下の実施例及び比較例では、研削性能に及ぼす異種砥粒の混合比率の影響を測定した。 Hereinafter, the present invention will be further described with reference to Examples and Comparative Examples. In the following examples and comparative examples, the influence of the mixing ratio of different abrasive grains on the grinding performance was measured.
横軸平面研削盤（岡本工作機械製作所製ＰＳＧ−５２ＤＸ［商品名］）を使用して、水平方向回転軸の周りで回転する円盤状砥石｛＃８０の「砥粒Ｂ」（第１の単結晶アルミナ砥粒）と＃８０の「砥粒Ａ」（第２の単結晶アルミナ砥粒）とを以下の表１に示す体積比［「砥粒Ｂ」：「砥粒Ａ」］で含むもの｝の外周面をその下方の工作物（被削材）｛高炭素クロム軸受鋼ＳＵＪ２（硬さ：ＨＲＣ６２）｝の上面に沿って水平方向に移動させる湿式プランジ平面研削（上向き研削）を行った。研削条件を以下に示す：
工作物寸法：１００Ｌ×５Ｔ×３０Ｈｍｍ
工作物速度：９ｍ／ｍｉｎ
砥石寸法：２００Ｄ×２０Ｔ×５０．８Ｈｍｍ、
砥石周速度：２０００ｍｍ／ｍｉｎ
砥石切り込み量：１０μｍ
研削液：ソリュブルタイプ（ＪＩＳ：Ｗ−２−２）２％溶液
尚、砥石はいずれも６．５φ−＃３０インプリダイヤモンドドレッサを用いて、砥石周速度２０００ｍｍ／ｍｉｎ、ドレッシング送り速度０．２ｍｍ／ｒｅｖ、ドレッサ切り込み量１０μｍ／ｐａｓｓ、湿式の条件で、ドレス量０．１ｍｍのドレッシングを行った後に、工作物の研削に供した。
Using a horizontal axis surface grinding machine (PSG-52DX [trade name] manufactured by Okamoto Machine Tool Manufacturing Co., Ltd.), a disc-shaped grindstone {#Abrasive B of # 80 (first unit) Crystalline alumina abrasive grains) and # 80 “abrasive grains A” (second single crystal alumina abrasive grains) in a volume ratio [“abrasive grains B”: “abrasive grains A”] shown in Table 1 below } Was subjected to wet plunge surface grinding (upward grinding) that horizontally moved along the upper surface of the workpiece (work material) {high carbon chrome bearing steel SUJ2 (hardness: HRC62)} below the workpiece (workpiece) . The grinding conditions are as follows:
Workpiece dimensions: 100 L x 5 T x 30 H mm
Work speed: 9m / min
Grinding wheel dimensions: 200 D x 20 T x 50.8 H mm,
Wheel peripheral speed: 2000mm / min
Grinding wheel cutting amount: 10μm
Grinding fluid: Soluble type (JIS: W-2-2) 2% solution In addition, the grindstone uses a 6.5φ- # 30 imple diamond dresser, the grindstone peripheral speed is 2000 mm / min, and the dressing feed speed is 0.2 mm / After dressing with a dress amount of 0.1 mm under rev, dresser cutting amount of 10 μm / pass, and wet conditions, the workpiece was ground.
以下の表１に、「砥粒Ｂ」：「砥粒Ａ」の比率を変化させた場合の、砥石摩耗量、研削比、研削抵抗及びドレス間隔（工作物の表面粗さが所定の値になるまでの工作物の研削量）の結果を示す。尚、表１における砥石摩耗量、研削比、研削抵抗及びドレス間隔の数値は、比較例１のものを１とした時の相対値で示されている。 In Table 1 below, when the ratio of “abrasive grain B”: “abrasive grain A” is changed, the grinding wheel wear amount, the grinding ratio, the grinding resistance, and the dress interval (the surface roughness of the workpiece is set to a predetermined value). The result of the grinding amount of the workpiece until the end is shown. In Table 1, the numerical values of the grinding wheel wear amount, the grinding ratio, the grinding resistance, and the dressing interval are shown as relative values when the value of Comparative Example 1 is 1.
以上の結果から分かるように、本発明の範囲内（実施例１〜６）の場合には、総合的に優れた研削性能が得られた。特に、実施例２〜５では一層高い研削性能が得られた。 As can be seen from the above results, overall excellent grinding performance was obtained within the scope of the present invention (Examples 1 to 6). In particular, in Examples 2 to 5, higher grinding performance was obtained.
Claims (7)
前記第１の単結晶アルミナ砥粒はその化学組成（酸化物換算）において９９．５質量％以上のＡｌ ２ Ｏ ３ を含み、前記第２の単結晶アルミナ砥粒はその化学組成（酸化物換算）において０．１質量％以上のＴｉＯ ２ 及び１質量％以上のＳＯ ３ を含むことを特徴とするビトリファイド砥石。 The first single crystal alumina abrasive grains and the second single crystal alumina abrasive grains having a lower strength and higher toughness than the first single crystal alumina abrasive grains in a volume ratio. Including the second single crystal alumina abrasive grains to be 70:30 to 97: 3 ,
The first single crystal alumina abrasive grain contains 99.5% by mass or more of Al 2 O 3 in its chemical composition (as oxide), and the second single crystal alumina abrasive grain has its chemical composition (as oxide). ) Containing 0.1% by mass or more of TiO 2 and 1% by mass or more of SO 3 .
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