JP3377977B2 - Rotating wheel grindstone - Google Patents
Rotating wheel grindstoneInfo
- Publication number
- JP3377977B2 JP3377977B2 JP2000094814A JP2000094814A JP3377977B2 JP 3377977 B2 JP3377977 B2 JP 3377977B2 JP 2000094814 A JP2000094814 A JP 2000094814A JP 2000094814 A JP2000094814 A JP 2000094814A JP 3377977 B2 JP3377977 B2 JP 3377977B2
- Authority
- JP
- Japan
- Prior art keywords
- base metal
- synthetic resin
- grindstone
- specific gravity
- resin particles
- 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 - Fee Related
Links
Landscapes
- Polishing Bodies And Polishing Tools (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、回転円盤砥石用の
台金に関し、とくに砥粒の結合剤としてレジンボンドを
用いた回転円盤砥石用の台金に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base metal for a rotary disc grindstone, and more particularly to a base metal for a rotary disc grindstone using a resin bond as a binder for abrasive grains.
【０００２】[0002]
【従来の技術】鉄鋼材料、超硬合金、サーメット、セラ
ミックスなどの研削加工用回転円盤砥石は、円盤状の台
金の周縁に砥粒をレジンボンドとともに砥材層として固
着したものがその基本的な構成である。2. Description of the Related Art A rotary disk grindstone for grinding steel materials, cemented carbide, cermet, ceramics, etc. is basically a disk-shaped base metal with abrasive grains fixed together with a resin bond as an abrasive layer. It is a simple structure.
【０００３】台金には主にアルミ合金が用いられるが、
高速回転にて使用する砥石の台金用としては強度及び剛
性が高い鉄または鉄系合金が主として用いられ、砥材層
は、ダイヤモンド砥粒やＣＢＮ砥粒などの超砥粒とフェ
ノール樹脂、ポリイミド樹脂、ポリエステル樹脂、エポ
キシ樹脂などの樹脂粉末の混合体を加圧成形することに
より形成され、成形と同時に台金に接合される直付けタ
イプと、接着剤にて接合される接着タイプの２種類があ
る。Aluminum alloy is mainly used for the base metal,
Iron or iron-based alloys with high strength and rigidity are mainly used for the base metal of the grindstone used at high speed rotation, and the abrasive material layer is superabrasive particles such as diamond abrasive grains and CBN abrasive grains and phenolic resin, polyimide. Two types: a direct mounting type that is formed by pressure molding a mixture of resin powders such as resin, polyester resin, and epoxy resin, and is directly bonded to the base metal at the same time as molding, and an adhesive type that is bonded with an adhesive. There is.
【０００４】ところで、研削の分野においては近年、高
能率化、高精度化を目的に、回転円盤砥石による研削は
高周速化へ移行している。高速研削のもとでは、鉄製台
金は比重が大きいために、高速化に伴う研削機械への負
担が大きくなり、砥石回転に要する電力が大きくなると
いう問題がある。また、砥石の重量が大きくなるため
に、砥石の高速回転により砥材層に過大な応力が発生し
て砥材層が剥離するおそれがある。また台金の比重が大
きいと、高速回転時に発生する振動が大きくなり、これ
も砥材層剥離の要因となる。By the way, in the field of grinding, in recent years, grinding with a rotating disk grindstone has been shifting to higher peripheral speed for the purpose of higher efficiency and higher accuracy. Under the high-speed grinding, the iron base metal has a large specific gravity, so that the load on the grinding machine is increased due to the increase in the speed, and there is a problem that the electric power required to rotate the grindstone is increased. Further, since the weight of the grindstone becomes large, there is a possibility that the abrasive material layer is peeled off due to excessive stress generated in the abrasive material layer due to the high-speed rotation of the grindstone. Further, if the specific gravity of the base metal is large, the vibration generated during high-speed rotation becomes large, which also causes the peeling of the abrasive layer.
【０００５】このようなことから、鉄製台金を用いた回
転円盤砥石では、砥石の周速度は２００ｍ／ｓｅｃが限
界であると考えられる。そこで、比重が大きく、台金と
砥材層の接合強度に不安のある鉄製台金に代えて、比重
が小さいアルミニウムまたはアルミニウム合金や合成樹
脂を用いた台金の使用も考えられる。しかし、アルミ合
金製台金は比重が２．７〜３．０程度であり、樹脂製台
金は比重が１．７〜２．１程度であるので、鉄製台金に
比べて高速回転時の遠心力に起因する問題の発生は少な
いといえるが、これらの材料は鉄製台金に比べ比強度
（引張り強度／比重）が２５〜３０％低下するため、鉄
製台金ほどの高周速化は望めない（表１参照）。鉄製台
金の代替品として理想的な台金は、比重が小さく、かつ
比強度が高い材質からなる台金である。From the above, it is considered that the rotating disk grindstone using the iron base metal has a limit of the peripheral speed of the grindstone of 200 m / sec. Therefore, instead of an iron base metal having a large specific gravity and having a concern about the bonding strength between the base metal and the abrasive layer, it is possible to use a base metal using aluminum or an aluminum alloy or a synthetic resin having a low specific gravity. However, since the aluminum alloy base metal has a specific gravity of about 2.7 to 3.0 and the resin base metal has a specific gravity of about 1.7 to 2.1, the specific gravity at the time of high-speed rotation is higher than that of the iron base metal. Although it can be said that there are few problems caused by centrifugal force, the specific strength (tensile strength / specific gravity) of these materials is 25 to 30% lower than that of the iron base metal. I can't hope (see Table 1). An ideal base metal as an alternative to an iron base metal is a base metal made of a material having low specific gravity and high specific strength.
【０００６】[0006]
【発明が解決しようとする課題】砥石を高速回転にて使
用する場合、砥石の台金を軽量化することにより研削機
械への負担を軽減することができる。また高速化及び砥
粒層の剥離に大きな影響を及ぼすと考えられる高速回転
時の振動は、砥石の動バランスが重要な要素になってく
る。砥石の回転軸回りの重量分布に偏心的なアンバラン
スが存在している場合、砥石を研削機械に実際に取り付
けて回転させたときに、この重量分布のアンバランス、
すなわち砥石の回転中心に対する重心のずれによって生
じる円周方向にわたる不均一な遠心力が作用して、回転
中の砥石に振動が生じる。When the grindstone is used at high speed rotation, the load on the grinding machine can be reduced by reducing the weight of the base metal of the grindstone. Further, the dynamic balance of the grindstone becomes an important factor in the vibration during high speed rotation, which is considered to have a great influence on the speedup and the separation of the abrasive grain layer. When there is an eccentric unbalance in the weight distribution around the rotation axis of the grindstone, when the grindstone is actually attached to the grinding machine and rotated, this weight distribution unbalance,
That is, a non-uniform centrifugal force acting in the circumferential direction caused by the displacement of the center of gravity of the grindstone with respect to the center of rotation acts on the grindstone to cause vibration.
【０００７】砥石の製作過程においては、回転軸回りの
重量分布が均一になるように製作されてはいるが、不可
避的な製作誤差などにより、わずかなアンバランスが残
ることは避けられない。このようなアンバランスが存在
する場合、その影響は砥石の全体重量が軽いほど小さく
なる。台金の外周に砥材層を有する回転円盤砥石では、
全体重量に占める台金の割合が大きく、台金の重量が軽
ければ軽いほど遠心力の作用が小さくなるので、動バラ
ンスの点で有利となり、砥石の製作も容易となる。In the manufacturing process of the grindstone, the grindstone is manufactured so that the weight distribution around the rotation axis is uniform, but it is inevitable that a slight imbalance remains due to an unavoidable manufacturing error. When such an imbalance is present, its effect becomes smaller as the total weight of the grindstone becomes lighter. With a rotating disk whetstone that has an abrasive layer on the outer periphery of the base metal,
The ratio of the base metal to the total weight is large, and the lighter the weight of the base metal, the smaller the effect of the centrifugal force, which is advantageous in terms of dynamic balance and facilitates the production of the grindstone.
【０００８】本発明が解決すべき課題は、砥石の高速回
転化に対処すべく台金の一層の軽量化をはかることにあ
る。An object to be solved by the present invention is to further reduce the weight of the base metal in order to cope with the high speed rotation of the grindstone.
【０００９】[0009]
【課題を解決するための手段】本発明は、円盤状の台金
の外周に砥材層を有する回転円盤砥石用の台金であっ
て、中実の合成樹脂粒体と中空の合成樹脂粒体を均一に
混合させ、見掛比重０．５４〜１．０５の合成樹脂製台
金としたことを特徴とする。DISCLOSURE OF THE INVENTION The present invention is a base metal for a rotary disk grindstone having an abrasive layer on the outer periphery of a disk-shaped base metal, which is solid synthetic resin particles and hollow synthetic resin particles. It is characterized in that the body is uniformly mixed to form a synthetic resin base metal having an apparent specific gravity of 0.54 to 1.05.
【００１０】中実の合成樹脂粒体と中空の合成樹脂粒体
を均一に混合させることにより、合成樹脂製台金として
の実用的な強度を維持したうえで台金をさらに軽量化す
ることができる。従来の合成樹脂製台金の比重は１．７
〜２．１程度であるので、これに比べても約１／２の軽
量化になる。By uniformly mixing the solid synthetic resin granules and the hollow synthetic resin granules, it is possible to further reduce the weight of the synthetic metal while maintaining practical strength as a synthetic resin base metal. it can. Conventional synthetic resin base metal has a specific gravity of 1.7.
Since it is about 2.1, the weight can be reduced by about 1/2.
【００１１】ここで、前記中空の合成樹脂粒体（以下、
中空粒体という）としては、粒径５〜１３０μｍで見掛
比重が０．１〜０．８の粒体を用いることが望ましい。
中空粒体は市販品として種々のものが流通しているが、
回転円盤砥石の台金の材料としての適性からみて、粒体
の粒径と比重が重要な要件となる。中空粒体の粒径につ
いては、中実の合成樹脂粒体（以下、中実粒体という）
との均一な混合が得られ、かつ台金としての強度を損な
わないために、中実粒体の粒径と同等である５〜１３０
μｍの粒径とするのがよい。粒径が５μｍ未満である
と、中空粒体内部の気孔も小さくて混合体の気孔率が低
いので、軽量化の効果が望めない。粒径が１３０μｍを
超えると中実粒体との粒径差が大きくなって均一な混合
が得られにくくなり、かつ中空粒体内部の気孔が大きく
なり台金の強度が低下する。Here, the hollow synthetic resin granules (hereinafter,
As the hollow particles), it is desirable to use particles having a particle size of 5 to 130 μm and an apparent specific gravity of 0.1 to 0.8.
Although various hollow granules are commercially available,
Considering the suitability of the rotating disk grindstone as a material for the base metal, the particle size and specific gravity of the particles are important requirements. Regarding the particle size of hollow particles, solid synthetic resin particles (hereinafter referred to as solid particles)
5 to 130, which is equivalent to the particle size of solid particles, in order to obtain a uniform mixture with
The particle size is preferably μm. If the particle size is less than 5 μm, the pores inside the hollow particles are also small and the porosity of the mixture is low, so the effect of weight reduction cannot be expected. If the particle size exceeds 130 μm, the difference in particle size from the solid particles becomes large, making it difficult to obtain a uniform mixture, and the pores inside the hollow particles become large, which lowers the strength of the base metal.
【００１２】中空粒体の見掛比重については、従来の合
成樹脂製台金の比重よりさらに５割程度の軽量化を達成
するために、少なくとも見掛比重は０．８以下とするの
がよい。中空粒体の見掛け比重が０．８超であると中空
粒体内部の気孔が粒径に対して相対的に小さくなり軽量
化の効果が望めない。見掛け比重が０．１未満では中空
粒体内部の気孔が粒径に対して相対的に大きくなり台金
の強度が低下する（表１参照）。Regarding the apparent specific gravity of the hollow particles, at least the apparent specific gravity is preferably 0.8 or less in order to achieve a weight reduction of about 50% as compared with the conventional synthetic resin base metal. . If the apparent specific gravity of the hollow granules exceeds 0.8, the pores inside the hollow granules become relatively small with respect to the particle diameter, and the effect of weight reduction cannot be expected. If the apparent specific gravity is less than 0.1, the pores inside the hollow particles become relatively large with respect to the particle size, and the strength of the base metal decreases (see Table 1).
【００１３】中実粒体と中空粒体の混合割合は、中空粒
体の粒径や見掛比重によっても異なるが、体積％にして
中実粒体３０〜８０％、中空粒体２０〜７０％の混合割
合とするのが望ましい。中空粒体の混合割合が２０体積
％より少ないと台金の軽量化が不十分となり、７０体積
％より多くなると台金の強度が低下し、いずれの場合も
比強度低下の原因となり、高周速域での実用化が困難と
なる。The mixing ratio of the solid particles and the hollow particles varies depending on the particle size of the hollow particles and the apparent specific gravity, but the volume ratio of the solid particles is 30 to 80%, and the hollow particles are 20 to 70. It is desirable to set the mixing ratio to%. If the mixing ratio of the hollow granules is less than 20% by volume, the weight of the base metal is insufficient, and if it is more than 70% by volume, the strength of the base metal is reduced. Practical application in the speed range becomes difficult.
【００１４】中実粒体としては、従来樹脂製台金に用い
られているフェノール樹脂、エポキシ樹脂、ポリエステ
ル樹脂などの合成樹脂を用いることができる。なかで
も、上記の中空粒体を混合した場合にも高い強度が維持
できるという点で好ましいのは、フェノール樹脂、エポ
キシ樹脂である。As the solid particles, synthetic resins such as phenol resin, epoxy resin and polyester resin, which have been conventionally used for resin base metal, can be used. Of these, phenol resins and epoxy resins are preferable in that high strength can be maintained even when the above hollow particles are mixed.
【００１５】台金の製造法自体は従来の樹脂製台金の製
造法と基本的に同じであり、中実粒体と中空粒体の混合
物を加圧成形、焼結して台金とする。中実粒体と中空粒
体の混合は、高速羽根撹拌機を使用することによって、
均一に混合することができる。The base metal manufacturing method itself is basically the same as the conventional resin base metal manufacturing method. A mixture of solid particles and hollow particles is pressure-molded and sintered to form a base metal. . Mixing of solid particles and hollow particles by using a high-speed blade agitator,
It can be mixed uniformly.
【００１６】本発明の台金に砥材層を接合したときの接
合強度は、従来の樹脂製台金の場合と同程度の接合強度
を維持することができる。もし、接合面に中空粒体の内
部機構が露出していたとしても、砥材層形成時に砥粒を
固定するために用いるレジンボンド（樹脂）が気孔のな
かに流れ込み硬化するので、気孔は消滅するとともに、
接合強度は従来の樹脂製台金よりもむしろ高くなる。The bonding strength when the abrasive layer is bonded to the base metal of the present invention can maintain the same bonding strength as that of the conventional resin base metal. Even if the internal mechanism of the hollow particles is exposed on the bonding surface, the resin bond (resin) used to fix the abrasive grains when forming the abrasive layer flows into the pores and hardens, so the pores disappear. Along with
The bonding strength is higher than that of the conventional resin base metal.
【００１７】[0017]
【発明の実施の形態】以下、試験例に基づいて本発明の
実施形態を説明する。図１に示すように、厚さ１０ｍ
ｍ、外径１９４ｍｍ、内径５０．８ｍｍの台金１の外周
に、外径２００ｍｍで内径１９４ｍｍの環状のダイヤモ
ンド砥材層２を接合した回転円盤砥石を、表１に示すよ
うに台金の材質および材料配合を変えて製作した。発明
品１〜６の砥石の台金に用いた中実粒体は平均粒径１５
μｍのフェノール樹脂であり、中空粒体は平均粒径９０
μｍ、見掛比重０．２３のフェノール樹脂である。比較
品１および比較品２は中実粒体と中空粒体の混合割合が
本発明の範囲を外れている砥石であり、従来品１は鉄合
金製台金、従来品２はアルミ合金製台金、従来品３は樹
脂製台金の砥石である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on test examples. As shown in Fig. 1, thickness is 10m
m, outer diameter 194 mm, inner diameter 50.8 mm, the outer circumference of the base metal 1 and an annular diamond abrasive material layer 2 with an outer diameter of 200 mm and an inner diameter of 194 mm were joined to the rotary disk grindstone, as shown in Table 1. It was manufactured by changing the material composition. The solid particles used for the base metal of the grindstones of the invention products 1 to 6 have an average particle size of 15
It is a phenolic resin of μm, and the hollow particles have an average particle size of 90.
It is a phenol resin having a μm and an apparent specific gravity of 0.23. Comparative product 1 and comparative product 2 are grinding stones in which the mixing ratio of solid particles and hollow particles is outside the range of the present invention. Conventional product 1 is an iron alloy base metal, and conventional product 2 is an aluminum alloy base. Gold, the conventional product 3 is a grindstone made of a resin base metal.
【００１８】各砥石の特性を表１に示す。表１からわか
るように、本発明にかかる砥石（発明品１〜６）は実用
的な強度を維持したうえで軽量化を達成している。The characteristics of each grindstone are shown in Table 1. As can be seen from Table 1, the grindstones according to the present invention (invention products 1 to 6) achieve a weight reduction while maintaining practical strength.
【表１】 [Table 1]
【００１９】[0019]
【発明の効果】回転円盤砥石の台金を、中実の合成樹脂
粒体と中空の合成樹脂粒体を均一に混合させ、見掛比重
０．５４〜１．０５の合成樹脂製台金とすることによ
り、合成樹脂製台金としての実用的な強度を維持したう
えで従来の合成樹脂製台金よりさらに軽量化することが
できる。EFFECTS OF THE INVENTION A base metal of a rotary disk grindstone is a base metal made of synthetic resin having an apparent specific gravity of 0.54 to 1.05 by uniformly mixing solid synthetic resin particles and hollow synthetic resin particles. By doing so, it is possible to further reduce the weight of the conventional synthetic resin base metal while maintaining the practical strength as the synthetic resin base metal.
【図１】 試験に供した超砥粒ホイールを示す図で
（ａ）は正面図、（ｂ）は縦断面図である。FIG. 1 is a view showing a superabrasive grain wheel used for a test, (a) is a front view and (b) is a longitudinal sectional view.
１ 台金 ２ 砥材層 1 unit 2 Abrasive layer
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−234474（ＪＰ，Ａ) 特開 平３−270877（ＪＰ，Ａ) 特開 平５−277956（ＪＰ，Ａ) 特開 平６−91535（ＪＰ，Ａ) 特開 平11−320354（ＪＰ，Ａ) 特開 平５−285848（ＪＰ，Ａ) 特開2000−79565（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B24D 5/00 B24D 3/00 310 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-234474 (JP, A) JP-A-3-270877 (JP, A) JP-A-5-277956 (JP, A) JP-A-6- 91535 (JP, A) JP 11-320354 (JP, A) JP 5-285848 (JP, A) JP 2000-79565 (JP, A) (58) Fields investigated (Int. Cl. 7) , DB name) B24D 5/00 B24D 3/00 310
Claims (3)
転円盤砥石用の台金であって、中実の合成樹脂粒体と中
空の合成樹脂粒体を均一に混合させ、見掛比重０．５４
〜１．０５の合成樹脂製台金としたことを特徴とする回
転円盤砥石用台金。1. A base metal for a rotary disk grindstone having an abrasive layer on the outer periphery of a disk-shaped base metal, wherein solid synthetic resin particles and hollow synthetic resin particles are uniformly mixed and Hanging specific gravity 0.54
A base metal for a rotating disk grindstone, which is a base metal made of synthetic resin of 1.05.
３０μｍで見掛比重が０．１〜０．８の粒体である請求
項１記載の回転円盤砥石用台金。2. The hollow synthetic resin particles have a particle size of 5 to 1
The base metal for a rotating disk grindstone according to claim 1, which is a particle having an apparent specific gravity of 0.1 to 0.8 at 30 μm.
成樹脂粒体の混合割合が、中実の合成樹脂粒体３０〜８
０体積％、中空の合成樹脂粒体２０〜７０体積％である
請求項１または２記載の回転円盤砥石用台金。3. The mixing ratio of the solid synthetic resin particles and the hollow synthetic resin particles is such that the solid synthetic resin particles 30 to 8 are solid.
The base metal for a rotary disk grindstone according to claim 1 or 2, wherein the content is 0% by volume and the hollow synthetic resin particles are 20 to 70% by volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000094814A JP3377977B2 (en) | 2000-03-30 | 2000-03-30 | Rotating wheel grindstone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000094814A JP3377977B2 (en) | 2000-03-30 | 2000-03-30 | Rotating wheel grindstone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001277135A JP2001277135A (en) | 2001-10-09 |
| JP3377977B2 true JP3377977B2 (en) | 2003-02-17 |
Family
ID=18609797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000094814A Expired - Fee Related JP3377977B2 (en) | 2000-03-30 | 2000-03-30 | Rotating wheel grindstone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3377977B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6988937B2 (en) * | 2002-04-11 | 2006-01-24 | Saint-Gobain Abrasives Technology Company | Method of roll grinding |
| CN109159034A (en) * | 2018-07-31 | 2019-01-08 | 秦皇岛道天精密磨具有限公司 | Plastic substrate grinding tool, the manufacturing method of tool matrix and material used |
-
2000
- 2000-03-30 JP JP2000094814A patent/JP3377977B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001277135A (en) | 2001-10-09 |
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