JP2013154441A - Vitrified bond grindstone manufacturing method and vitrified bond grindstone - Google Patents

Vitrified bond grindstone manufacturing method and vitrified bond grindstone Download PDF

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JP2013154441A
JP2013154441A JP2012018047A JP2012018047A JP2013154441A JP 2013154441 A JP2013154441 A JP 2013154441A JP 2012018047 A JP2012018047 A JP 2012018047A JP 2012018047 A JP2012018047 A JP 2012018047A JP 2013154441 A JP2013154441 A JP 2013154441A
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glass
layer
vitrified bond
bond grindstone
mixed
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Shinji Soma
伸司 相馬
Naoto Ono
直人 小野
Satoyuki Kasuga
智行 春日
Akira Ito
亮 伊藤
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JTEKT Corp
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JTEKT Corp
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Priority to JP2012018047A priority Critical patent/JP2013154441A/en
Priority to PCT/JP2013/052136 priority patent/WO2013115295A1/en
Priority to US14/372,082 priority patent/US9908216B2/en
Priority to CN201380005551.0A priority patent/CN104066548B/en
Priority to EP13744108.5A priority patent/EP2810740B1/en
Publication of JP2013154441A publication Critical patent/JP2013154441A/en
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Abstract

PROBLEM TO BE SOLVED: To manufacture a vitrified bond grindstone having greater abrasive grain holding force, the grindstone that strikes a balance between the improvement of adhesion of a bonding layer with abrasive grains and the improvement of wear resistance of the bonding layer.SOLUTION: A coated abrasive grain 1 where a glass coating layer 12 comprising only glass is formed on an outside of a cBN or diamond abrasive grain 11 and a mixed coating layer 13 with which glass and an additive mixed is formed on an outside of the glass coating layer 12 is manufactured. The coated abrasive grains 1 are mixed with a binder, and molded and sintered to manufacture a vitrified bond grindstone 5. Through the manufacturing processes, the vitrified bond grindstone 5 having greater abrasive grain holding force because of the glass layer 3 excellent in adhesion formed around the cBN abrasive grain 11 and provided with a mixed layer 4 having high abrasion resistance because of added particles can be manufactured.

Description

本発明は、ガラスのボンド層を備えたビトリファイドボンド砥石の製造方法およびビトリファイドボンド砥石に関するものである。   The present invention relates to a method for producing a vitrified bond grindstone having a glass bond layer and a vitrified bond grindstone.

ｃＢＮ又はダイヤモンドの砥粒を用いたビトリファイドボンド砥石において、砥粒の分散性の向上を図るために、砥粒の表面にガラス質のみ、又はガラス質と金属酸化物等の硬質粒子を混合した被覆層を形成した被覆砥粒を加圧成形後に焼結して砥石を製造する従来技術がある（例えば、特許文献１参照）。   In a vitrified bond grindstone using cBN or diamond abrasive grains, in order to improve the dispersibility of the abrasive grains, the surface of the abrasive grains is coated with only vitreous or a mixture of hard particles such as vitreous and metal oxide. There is a conventional technique in which a coated abrasive grain having a layer formed is sintered after pressure forming to manufacture a grindstone (see, for example, Patent Document 1).

特開平９−１３２７７１号公報Japanese Patent Laid-Open No. 9-132771

上述の従来技術では、砥粒の分布は均一化され改善されるがガラスのみ又は、ガラスに硬質粒子を混合した同一組成のボンド層が形成されるので、砥粒保持力の向上に必要なボンド層と砥粒の密着性の向上とボンド層の強度向上を両立することが困難である。すなわち、ガラスのみのボンド層では砥粒とボンドの密着性は良いが、ボンド層の強度向上には限界がある。一方、ガラスに硬質粒子を混合した場合は、ボンド層の強度は向上するが、焼結時に、硬質粒子がガラスの流動性を妨げるため砥粒とボンドの密着性が悪くなる。
本発明は上記事情に鑑みてなされたものであり、ボンド層と砥粒の密着性とボンド層の強度向上を両立し、砥粒保持力の大きなビトリファイドボンド砥石を製造することを目的とする。 In the above-described prior art, the distribution of abrasive grains is made uniform and improved. However, since only a glass or a bond layer of the same composition in which hard particles are mixed with glass is formed, a bond necessary for improving the abrasive holding power is formed. It is difficult to improve both the adhesion between the layer and the abrasive grains and the strength of the bond layer. That is, in the bond layer made only of glass, the adhesiveness between the abrasive grains and the bond is good, but there is a limit to improving the strength of the bond layer. On the other hand, when hard particles are mixed with glass, the strength of the bond layer is improved, but during sintering, the hard particles impede the fluidity of the glass, resulting in poor adhesion between the abrasive grains and the bond.
The present invention has been made in view of the above circumstances, and an object of the present invention is to produce a vitrified bond grindstone having both high adhesion of the bond layer and abrasive grains and improved strength of the bond layer, and having a large abrasive grain retention.

上記の課題を解決するため、請求項１に係る発明の特徴は、ｃＢＮ又はダイヤモンドの砥粒の表面に被覆層を形成した後、所定形状に加圧成形し、焼結するビトリファイドボンド砥石の製造方法において、
前記被覆層を、前記砥粒の表面にガラスのみから成る第１被覆層を成形後に、前記第１被覆層の外側にガラスと添加物を混合した第２被覆層を形成することで形成することである。 In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a vitrified bond grindstone is formed by forming a coating layer on the surface of cBN or diamond abrasive grains, press-molding into a predetermined shape, and sintering. In the method
The coating layer is formed by forming a first coating layer made only of glass on the surface of the abrasive grains, and then forming a second coating layer in which glass and an additive are mixed outside the first coating layer. It is.

請求項２に係る発明の特徴は、ｃＢＮ又はダイヤモンドの砥粒の表面にガラスのみから成る第１層を備え、前記第１層の外側に前記ガラスと添加物が混合された第２層を備えることである。   According to a second aspect of the present invention, a cBN or diamond abrasive grain has a first layer made of only glass, and a second layer in which the glass and an additive are mixed outside the first layer. That is.

請求項３に係る発明の特徴は、請求項２に関わる発明において、前記添加物が前記ガラスの硬度より大きな硬度を備えることである。   A feature of the invention according to claim 3 is that, in the invention according to claim 2, the additive has a hardness larger than the hardness of the glass.

請求項1に係る発明によれば、焼結時に添加物によりガラスの流動性が妨げられないのでガラスと砥粒が密着し、砥粒から離れた部位は添加物が分散することにより所望の特性を備えるボンド層となる。これにより砥粒保持力が高く所望のボンド特性を備えたビトリファイドボンド砥石を製造できる。   According to the invention of claim 1, since the fluidity of the glass is not hindered by the additive during sintering, the glass and the abrasive grains are in close contact with each other, and a desired property is obtained by dispersing the additive in a portion away from the abrasive grains. It becomes a bond layer provided with. Thereby, a vitrified bond grindstone having a high abrasive grain holding power and desired bond characteristics can be manufactured.

請求項２に係る発明によれば、ガラスと砥粒が密着し、砥粒から離れた部位は添加物が分散することにより所望の特性を備えるボンド層となる。これにより砥粒保持力が高く所望のボンド特性を備えたビトリファイドボンド砥石を実現できる。   According to the invention which concerns on Claim 2, glass and an abrasive grain closely_contact | adhere, and the site | part away from the abrasive grain becomes a bond layer provided with a desired characteristic, when an additive disperse | distributes. As a result, a vitrified bond grindstone having high abrasive grain retention and having desired bond characteristics can be realized.

請求項３に係る発明によれば、砥粒から離れた部位は硬度の高い添加物が分散しているので研削による磨耗が小さく、寿命の長いビトリファイドボンド砥石を実現できる。   According to the third aspect of the present invention, a high-hardness additive is dispersed in the part away from the abrasive grains, so that wear due to grinding is small and a vitrified bond grindstone with a long life can be realized.

本実施形態の被覆砥粒の断面模式図である。It is a cross-sectional schematic diagram of the coated abrasive grain of this embodiment. 本実施形態の被覆砥粒の加圧成形時の組織の模式図である。It is a schematic diagram of the structure | tissue at the time of the pressure molding of the coated abrasive grain of this embodiment. 本実施形態のビトリファイドボンド砥石の模式図である。It is a schematic diagram of the vitrified bond grindstone of this embodiment.

以下、本発明の実施の形態をｃＢＮビトリファイドボンド砥石の例で説明する。
図１に模式的に示すように、被覆砥粒１はｃＢＮ砥粒１１の表面にガラス被覆層（第１被覆層）１２を備え、その外側にガラスと硬質粒子からなる混合被覆層（第２被覆層）１３を備えている。 Hereinafter, an embodiment of the present invention will be described using an example of a cBN vitrified bond grindstone.
As schematically shown in FIG. 1, the coated abrasive grain 1 includes a glass coating layer (first coating layer) 12 on the surface of the cBN abrasive grain 11, and a mixed coating layer (second coating layer made of glass and hard particles) on the outside thereof. Coating layer) 13 is provided.

ガラス被覆層１２の被覆は粒径数μｍ以下のガラス粉末をポリビニルアルコールなどのバインダーでｃＢＮ砥粒に接着後乾燥させて形成する。
混合被覆層１３は、ガラス被覆層１２の上に、粒径数μｍ以下のガラス粉末とムライト、アルミナ、酸化チタン、珪酸ジルコニウム等の粒径数μｍ以下の硬質微粒子の混合粉を、上記バインダーにより接着後乾燥させて形成する。 The coating of the glass coating layer 12 is formed by adhering glass powder having a particle size of several μm or less to cBN abrasive grains with a binder such as polyvinyl alcohol and then drying.
The mixed coating layer 13 is a mixture of glass powder having a particle size of several μm or less and hard fine particles having a particle size of several μm or less such as mullite, alumina, titanium oxide, zirconium silicate, etc. It is formed by drying after bonding.

次に、上記により製造した被覆砥粒１に必要に応じて成形用バインダーを添加して混合し、所定の形状に加圧成形し、バインダー揮発温度以上の所定温度で脱脂処理する。このときの組織を模式的に図２に示す。   Next, a binder for molding is added to the coated abrasive 1 produced as described above and mixed as necessary, pressure-molded into a predetermined shape, and degreased at a predetermined temperature equal to or higher than the binder volatilization temperature. The structure at this time is schematically shown in FIG.

次に焼結を行うが、焼結時にガラスは軟化して流動するが添加粒子が混在するとガラスの流動性が妨げられる。本発明の被覆砥粒においては、ｃＢＮ砥粒１１の周囲はガラスのみであるため、図３に示すように、焼成時に軟化したガラスが十分に流動してｃＢＮ砥粒１１の全周に密着したガラス層（第１層）３が形成される。ｃＢＮ砥粒１１から離れた部分ではガラスに添加粒子が混在する混合層（第２層）４と空孔２が形成される。すなわち、ガラス層３はｃＢＮ砥粒１１と密着性が良いため砥粒保持力が強く、添加粒子により耐磨耗性の高い混合層４を形成できる。   Next, although sintering is performed, the glass softens and flows at the time of sintering, but if additive particles are mixed, the fluidity of the glass is hindered. In the coated abrasive grains of the present invention, since the periphery of the cBN abrasive grains 11 is only glass, as shown in FIG. 3, the glass softened during firing sufficiently flows and adheres to the entire circumference of the cBN abrasive grains 11. A glass layer (first layer) 3 is formed. In a portion away from the cBN abrasive grains 11, a mixed layer (second layer) 4 and pores 2 in which additive particles are mixed in the glass are formed. That is, since the glass layer 3 has good adhesion to the cBN abrasive grains 11, the abrasive grain retention is strong, and the mixed layer 4 having high wear resistance can be formed by the added particles.

本発明のビトリファイドボンド砥石を用いて研削を行うと、ｃＢＮ砥粒１１に研削力が作用するが、ガラスが密着して砥粒保持力が強いためｃＢＮ砥粒１１の脱落を生じにくい。また、混合層４は切屑の流動により磨耗作用を受けるが、硬質粒子が混在するため磨耗が少ない。結果として、高能率研削においても消耗の少ないビトリファイドボンド砥石５を実現できる。   When grinding is performed using the vitrified bond grindstone of the present invention, a grinding force acts on the cBN abrasive grains 11, but the cBN abrasive grains 11 are unlikely to drop off because the glass adheres closely and the abrasive grain holding power is strong. Further, the mixed layer 4 is subjected to an abrasion action by the flow of chips, but wear is small because hard particles are mixed. As a result, it is possible to realize the vitrified bond grindstone 5 with little wear even in high-efficiency grinding.

上記の実施例では、添加物に硬質粒子を用いてブリッジ部の耐摩耗性を向上したが、中空粒子等の破砕性の大きな粒子を添加してドレッシング性を良くしてもよい。
また、ｃＢＮ砥粒１１に換えてダイヤモンド砥粒を用いてもよい。 In the above embodiment, the hard particles are used as the additive to improve the wear resistance of the bridge portion. However, the dressability may be improved by adding particles having high friability such as hollow particles.
Further, diamond abrasive grains may be used in place of the cBN abrasive grains 11.

１：被覆砥粒 ２：空孔 ３：ガラス層 ４：混合層 ５：ビトリファイドボンド砥石 １１：ｃＢＮ砥粒 １２：ガラス被覆層 １３：混合被覆層 1: Coated abrasive grains 2: Holes 3: Glass layer 4: Mixed layer 5: Vitrified bond wheel 11: cBN abrasive grains 12: Glass coated layer 13: Mixed coated layer

Claims (3)

ｃＢＮ又はダイヤモンドの砥粒に被覆層を形成した後、所定形状に加圧成形し、焼結するビトリファイドボンド砥石の製造方法において、
前記被覆層を、前記砥粒の表面にガラスのみから成る第１被覆層を成形後に、前記第１被覆層の外側にガラスと添加物を混合した第２被覆層を形成することで形成するビトリファイドボンド砥石の製造方法。 In the method for producing a vitrified bond grindstone, after forming a coating layer on abrasive grains of cBN or diamond, press-molding into a predetermined shape, and sintering.
Vitrified formed by forming the coating layer after forming a first coating layer made only of glass on the surface of the abrasive grains and then forming a second coating layer in which glass and an additive are mixed outside the first coating layer. A method for manufacturing a bond grindstone. ｃＢＮ又はダイヤモンドの砥粒の表面にガラスのみから成る第１層を備え、前記第１層の外側に前記ガラスと添加物が混合された第２層を備えるビトリファイドボンド砥石。   A vitrified bond grindstone comprising a first layer made only of glass on the surface of an abrasive grain of cBN or diamond, and a second layer in which the glass and an additive are mixed outside the first layer. 前記添加物が前記ガラスの硬度より大きな硬度を備える請求項２記載のビトリファイドボンド砥石。   The vitrified bond grindstone according to claim 2, wherein the additive has a hardness greater than that of the glass.
JP2012018047A 2012-01-31 2012-01-31 Vitrified bond grindstone manufacturing method and vitrified bond grindstone Pending JP2013154441A (en)

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JP2012018047A JP2013154441A (en) 2012-01-31 2012-01-31 Vitrified bond grindstone manufacturing method and vitrified bond grindstone
PCT/JP2013/052136 WO2013115295A1 (en) 2012-01-31 2013-01-31 Grindstone manufacturing method and grindstone
US14/372,082 US9908216B2 (en) 2012-01-31 2013-01-31 Grinding wheel manufacturing method and grinding wheel
CN201380005551.0A CN104066548B (en) 2012-01-31 2013-01-31 The manufacture method and grinding tool of grinding tool
EP13744108.5A EP2810740B1 (en) 2012-01-31 2013-01-31 Grindstone manufacturing method and grindstone

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115056148A (en) * 2022-06-28 2022-09-16 启东蓝威金刚石科技有限公司 Ceramic composite grinding wheel and manufacturing method thereof
CN115056148B (en) * 2022-06-28 2024-03-19 启东蓝威金刚石科技有限公司 Ceramic composite grinding wheel and manufacturing method thereof

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