JP4194235B2 - Grinding wheel - Google Patents

Grinding wheel Download PDF

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Publication number
JP4194235B2
JP4194235B2 JP2000294788A JP2000294788A JP4194235B2 JP 4194235 B2 JP4194235 B2 JP 4194235B2 JP 2000294788 A JP2000294788 A JP 2000294788A JP 2000294788 A JP2000294788 A JP 2000294788A JP 4194235 B2 JP4194235 B2 JP 4194235B2
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Japan
Prior art keywords
grinding wheel
shaft
tapered
grindstone
grinding
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JP2002103236A (en
Inventor
晴彦 齋藤
雅裕 井▲土▼
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JTEKT Corp
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JTEKT Corp
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  • Polishing Bodies And Polishing Tools (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、研削盤における砥石車、特に高周速加工用の砥石車に関する。
【０００２】
【従来の技術】
従来の技術における研削盤の砥石車１は、図３に示すように、研削盤の砥石軸２の先端部の砥石車装着部に装着される。
砥石車装着部は、砥石軸２の先端面に外周段部３を残して突出した先細のテーパ部４である。そして、砥石軸２には、テーパ部４の先端面に開口した適宜数のねじ穴５が軸心中心に円周等配に形成されている。
【０００３】
砥石車１は、厚肉円板状の砥石コア１１の外周面に砥石層１２が形成されている。砥石コア１１の一方の側面（内側面）の中心部には、軸方向内側に向って先細のテーパ穴１４が形成されている。即ち、砥石軸２への砥石車１の装着において、テーパ穴１４が砥石軸２の先端のテーパ部４に嵌合するのである。
【０００４】
砥石コア１１の他方の側面（外側面）の中心部には、円形凹部１５が形成され、円形凹部１５の底面とテーパ穴１４の底面とにより薄肉部１６が形成される。
薄肉部１６には、軸方向に貫通した適宜数のボルト孔１７が軸心中心に円周等配に形成されている。砥石車１のテーパ穴１４が砥石軸２の先端のテーパ部４に嵌合したとき、ボルト孔１７とねじ穴５とは同軸関係に対向する。
【０００５】
砥石車１は、テーパ穴１４が砥石軸２の先端のテーパ部４に嵌合され、円形凹部１５の底面から各ボルト孔１７に挿入された取付けボルト６が砥石軸２の各ねじ穴５にねじ込まれ締め付けられることにより、砥石軸１に取り付けられる。
取付けボルト６の締め付けにより、互に接触する砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間に接触面圧、摩擦が生じ、それにより、砥石軸の回転トルクが砥石車に伝達される。
【０００６】
研削加工において、研削盤の砥石軸２がモータ（図示しない）により回転駆動され、砥石軸２に取り付けられて砥石軸２と共に回転する砥石車１が工作物（図示しない）に接触して研削が行われる。
【０００７】
【発明が解決しようとする課題】
上記の従来の技術における砥石車１は、研削時に砥石軸２が高速回転された場合、砥石軸２と一体となって高速回転する。すると、砥石車１に生じる遠心力により砥石車１、即ち砥石コア１１が遠心膨張する。従って、互に接触する砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間の接触面圧が低下し、延いては摩擦が減少する。
【０００８】
その結果、砥石軸２から砥石車１に伝達される回転トルクにおいて、砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間に滑りが生じない限度の伝達トルク、即ち限界トルクが低下する。又、砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間に滑りが生じれば、振動が生じ、加工精度も低下する。
【０００９】
そのため、砥石車の回転速度や研削量に制限が生じ、所謂高速研削が困難となる。
この発明は、そのような欠点を除去し、高速研削に適した砥石車を提供するものである。
【００１０】
【課題を解決するための手段】
このような課題は、砥石コアの中心部側面に突出形成されたボス部にボス部の軸線方向長さと同一乃至略同一である深さのテーパ穴が形成され、そのテーパ穴が砥石軸の先端テーパ軸部に嵌合されて、砥石軸に取り付けられるようにしても解決することができる。
【００１１】
この発明の砥石車は、砥石コアの一側面において、中心にテーパ穴が形成され、前記一側面にテーパ穴の外側に同心的にテーパ穴と深さが同一乃至略同一の環状凹溝が形成され、そのテーパ穴が砥石軸の先端テーパ軸部に嵌合されて、砥石軸に取り付けられる。
【００１２】
砥石車の回転において、テーパ穴とテーパ軸部との間の接触面圧に影響を与える遠心力は、砥石コアのボス部や砥石コアの環状凹溝内側部に働く遠心力だけである。
【００１３】
【発明の実施の形態】
この発明の実施の形態における砥石車を図面に従って説明する。
図１は、この出願の発明とは異なる解決手段によって、この出願の発明の課題を解決したものを参考例として挙げたものであり、図２は、この発明の実施の形態である。
図１及び図２において、砥石車１は、研削盤の砥石軸２の先端部の砥石車装着部に装着される。砥石車装着部は、砥石軸２の先端面に外周段部３を残して突出した先細のテーパ部４である。そして、砥石軸２には、テーパ部４の先端面に開口した適宜数のねじ穴５が軸心中心に円周等配に形成されている。
【００１４】
参考例における砥石車１は、厚肉円板状の砥石コア１１の外周面に砥石層１２が形成されている。砥石コア１１の一方の側面（内側面）の中心部には、ボス部１３が突出形成されており、ボス部１３の端面から軸方向内側に向って先細のテーパ穴１４が形成されている。
【００１５】
ボス部１３の軸線方向の長さとテーパ穴１４の深さとは同一乃至略同一であることが好ましい。
そして、砥石軸２への砥石車１の装着において、テーパ穴１４が砥石軸２の先端のテーパ部４に嵌合するのである。
【００１６】
砥石コア１１の他方の側面（外側面）の中心部には、円形凹部１５が形成され、円形凹部１５の底面とテーパ穴１４の底面とにより薄肉部１６が形成される。
薄肉部１６には、軸方向に貫通した適宜数のボルト孔１７が軸心中心に円周等配に形成されている。砥石車１のテーパ穴１４が砥石軸２の先端のテーパ部４に嵌合したとき、ボルト孔１７とねじ穴５とは同軸関係に対向する。
【００１７】
砥石車１は、テーパ穴１４が砥石軸２の先端のテーパ部４に嵌合され、円形凹部１５の底面から各ボルト孔１７に挿入された取付けボルト６が砥石軸２の各ねじ穴５にねじ込まれ締め付けられることにより、砥石軸１に取り付けられる。
取付けボルト６の締め付けにより、互に接触する砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間に接触面圧が生じる。
【００１８】
研削加工において、研削盤の砥石軸２がモータ（図示しない）により回転駆動され、砥石軸２に取り付けられて砥石軸２と共に回転する砥石車１が工作物（図示しない）に接触して研削が行われる。
その際、砥石車１に加わる研削速度、切込量、送り量等に基づく研削抵抗によって、砥石車１には、砥石軸６の回転を阻止する方向の力が働くが、砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間には接触面圧により摩擦が生じ、砥石車１に加わる研削抵抗に対して砥石軸２の回転トルクが砥石車１に伝達される。
【００１９】
そして、研削抵抗が前記接触面圧により生じる摩擦に打ち勝つと、砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間に滑りが生じるが、そのようなことのない研削抵抗の限度内で砥石軸２の回転トルクが砥石車１に伝達される。
【００２０】
その滑りが生じることがない研削抵抗の限度における伝達トルク、即ち限界トルクは、砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間の摩擦、即ち接触面圧により定まる。
そして、回転する砥石車１には、遠心力が働き、その結果、砥石車１、即ち砥石コア１１は遠心膨張する。
【００２１】
その際、砥石コア１１の軸線方向の各部に働く遠心力（Ｆ１，Ｆ２）は各部夫々の回転速度、重心半径及び重量（砥石層１２を含む、以下同じ）によるものであるので、砥石コア１１のボス部１３に働く遠心力Ｆ２は、砥石層１２がある砥石コア１１の他の部分が関与しない。従って、重心半径と重量とが小さいボス部１３に働く遠心力、即ち遠心膨張量は、他の部分より小さい。
【００２２】
その結果、砥石コア１１のテーパ穴１４と砥石軸２のテーパ部４との軸方向の主な範囲は遠心膨張量が小さいボス部１３の範囲にあるので、砥石車１の回転時における遠心力による両者の内外周面間の接触面圧の減少は少ない。即ち、砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間の摩擦力の減少、即ち限界トルクの低下は小さい。
上記のように遠心力の限界トルクへの影響が少ない上記の砥石車１においては、高速回転による研削、高速研削が問題なく安定して行なわれる。
【００２３】
砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間の接触面圧（即ち摩擦力）に対する回転（即ち遠心力）の影響についての比較実例値は、図５及び図６のように示される。なお、図５及び図６における横軸、即ちテーパ面位置は図４における矢印方向における位置である。
【００２４】
この参考例の比較実施値によっても、ボス部１３の有無による、砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間の接触面圧、限界トルクに回転が与える影響の差、即ちボス部１３の具備により影響が少ないことは明らかである。
【００２５】
図２に示すこの発明の実施の形態における砥石車１としては、図２に左右で別の形式例で示すものがある。即ち左半分が第１例、右半分が第２例を示す。
砥石車１の砥石コア１１の一方の側面（内側面）の中心部には、砥石軸２への装着において、砥石軸２の先端のテーパ部４に嵌合する軸方向内側に向って先細のテーパ穴１４が形成されている。
【００２６】
そして、テーパ穴１４が形成されている方の砥石コア１１の一方の側面（内側面）には、テーパ穴１４の開口周より適宜量大きい半径域で、同一的に狭幅環状溝１８又は広幅環状溝１９が形成されている。 テーパ穴１４と狭幅環状溝１８・広幅環状溝１９とは深さが同一乃至略同一である。
【００２７】
この実施の形態における砥石車１においては、砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間の接触面圧、即ち両面間の摩擦力に対し回転時に影響を与える遠心力が働く部分は、軸方向で前記両面に該当する砥石コア１１の部分の狭幅環状溝１８・広幅環状溝１９より内径部分である。
【００２８】
即ち、狭幅環状溝１８・広幅環状溝１９より外径部分の砥石コア１１に働く遠心力は、狭幅環状溝１８・広幅環状溝１９により遮断されて、砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間の接触面圧に影響しない。
【００２９】
従って、重心半径と重量とが小さい狭幅環状溝１８・広幅環状溝１９より内径部分に働く遠心力Ｆ２、即ち遠心膨張量は、他の部分より小さい。その結果、砥石車１の回転時における遠心力による両者の内外周面間の接触面圧の減少は少ない。即ち、砥石コア１１のテーパ穴１４の内周面と砥石軸２のテーパ部４の外周面との間の摩擦力の減少、即ち限界トルクの低下は小さい。この点及びその結果の作用・効果は、参考例と同じである。
【００３０】
【発明の効果】
この発明の砥石車においては、研削時に砥石車が回転された場合、砥石車に働く遠心力による砥石車の遠心膨張に起因する砥石車と砥石軸との取り付け嵌合面の接触面圧の減小を低減されるので、砥石車を高速回転しても、砥石車と砥石軸との取り付け嵌合における伝達トルクの低減及び滑りによる振動の発生は抑制され、砥石車の回転速度や研削量に制限が生じない。即ち、加工精度を保って所謂高速研削が可能となる。
【図面の簡単な説明】
【図１】 この発明の技術的課題を解決する参考例の砥石車の断面図である。
【図２】 この発明の実施の形態における砥石車の断面図である。
【図３】 従来の技術における砥石車の断面図である。
【図４】 砥石車の取付けテーパ面における図５及び図６のグラフの横軸に該当する方向を示す説明図である。
【図５】 参考例における砥石車の性能グラフである。
【図６】 従来の技術における砥石車の性能グラフである。
【符号の説明】
１ 砥石車
２ 砥石軸
３ 外周段部
４ テーパ部
５ ねじ穴
６ ボルト
１１ 砥石コア
１２ 砥石層
１３ ボス部
１４ テーパ穴
１５ 円形凹部
１６ 薄肉部
１７ ボルト孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grinding wheel in a grinding machine, and more particularly to a grinding wheel for high peripheral speed machining.
[0002]
[Prior art]
As shown in FIG. 3, the grinding wheel 1 of the grinding machine according to the prior art is mounted on the grinding wheel mounting portion at the tip of the grinding wheel shaft 2 of the grinding machine.
The grinding wheel mounting portion is a tapered portion 4 that protrudes leaving the outer peripheral step portion 3 on the tip surface of the grinding wheel shaft 2. The grindstone shaft 2 is formed with an appropriate number of screw holes 5 opened at the front end surface of the taper portion 4 so as to be equally spaced around the center of the shaft center.
[0003]
In the grinding wheel 1, a grinding wheel layer 12 is formed on the outer peripheral surface of a thick disc-shaped grinding wheel core 11. A tapered hole 14 that is tapered toward the inner side in the axial direction is formed at the center of one side surface (inner side surface) of the grindstone core 11. That is, when the grinding wheel 1 is mounted on the grinding wheel shaft 2, the tapered hole 14 is fitted into the tapered portion 4 at the tip of the grinding wheel shaft 2.
[0004]
A circular recess 15 is formed at the center of the other side surface (outer surface) of the grindstone core 11, and a thin portion 16 is formed by the bottom surface of the circular recess 15 and the bottom surface of the tapered hole 14.
An appropriate number of bolt holes 17 penetrating in the axial direction are formed in the thin-walled portion 16 so as to be equally spaced around the center of the shaft. When the tapered hole 14 of the grinding wheel 1 is fitted into the tapered portion 4 at the tip of the grinding wheel shaft 2, the bolt hole 17 and the screw hole 5 face each other in a coaxial relationship.
[0005]
In the grinding wheel 1, the tapered hole 14 is fitted into the tapered portion 4 at the tip of the grinding wheel shaft 2, and the mounting bolt 6 inserted into each bolt hole 17 from the bottom surface of the circular recess 15 is inserted into each screw hole 5 of the grinding wheel shaft 2. It is attached to the grindstone shaft 1 by being screwed and tightened.
When the mounting bolt 6 is tightened, contact surface pressure and friction are generated between the inner peripheral surface of the tapered hole 14 of the grindstone core 11 and the outer peripheral surface of the tapered portion 4 of the grindstone shaft 2 which are in contact with each other. Is transmitted to the grinding wheel.
[0006]
In the grinding process, the grinding wheel shaft 2 of the grinding machine is rotationally driven by a motor (not shown), and the grinding wheel 1 attached to the grinding wheel shaft 2 and rotating together with the grinding wheel shaft 2 contacts the workpiece (not shown) for grinding. Done.
[0007]
[Problems to be solved by the invention]
The grinding wheel 1 in the above-described conventional technology rotates at a high speed integrally with the grinding wheel shaft 2 when the grinding wheel shaft 2 is rotated at a high speed during grinding. Then, the grinding wheel 1, that is, the grinding wheel core 11 is centrifugally expanded by the centrifugal force generated in the grinding wheel 1. Therefore, the contact surface pressure between the inner peripheral surface of the tapered hole 14 of the grindstone core 11 and the outer peripheral surface of the tapered portion 4 of the grindstone shaft 2 that are in contact with each other decreases, and the friction decreases.
[0008]
As a result, in the rotational torque transmitted from the grinding wheel shaft 2 to the grinding wheel 1, the limit is such that no slip occurs between the inner circumferential surface of the tapered hole 14 of the grinding wheel core 11 and the outer circumferential surface of the tapered portion 4 of the grinding wheel shaft 2. The transmission torque, that is, the limit torque is reduced. Further, if slip occurs between the inner peripheral surface of the tapered hole 14 of the grindstone core 11 and the outer peripheral surface of the tapered portion 4 of the grindstone shaft 2, vibration occurs and processing accuracy also decreases.
[0009]
Therefore, the rotational speed and grinding amount of the grinding wheel are limited, and so-called high-speed grinding becomes difficult.
The present invention eliminates such drawbacks and provides a grinding wheel suitable for high speed grinding.
[0010]
[Means for Solving the Problems]
Such a problem is that a taper hole having a depth that is the same as or substantially the same as the axial length of the boss part is formed in the boss part that protrudes from the side surface of the center part of the grindstone core, and the taper hole is the tip of the grindstone shaft. The problem can be solved by fitting the taper shaft portion to the grindstone shaft.
[0011]
In the grinding wheel of the present invention , a tapered hole is formed in the center on one side of the grinding wheel core, and an annular groove having the same or substantially the same depth as the tapered hole is formed concentrically outside the tapered hole on the one side. Then, the tapered hole is fitted to the tip tapered shaft portion of the grindstone shaft and attached to the grindstone shaft.
[0012]
In the rotation of the grinding wheel, the centrifugal force that affects the contact surface pressure between the tapered hole and the tapered shaft portion is only the centrifugal force that acts on the boss portion of the grindstone core and the inner side of the annular groove of the grindstone core.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A grinding wheel according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows, as a reference example, a solution obtained by solving the problems of the invention of this application by means of a solution different from the invention of this application, and FIG. 2 shows an embodiment of the invention.
1 and 2, the grinding wheel 1 is mounted on the grinding wheel mounting portion at the tip of the grinding wheel shaft 2 of the grinding machine. The grinding wheel mounting portion is a tapered portion 4 that protrudes leaving the outer peripheral step portion 3 on the tip surface of the grinding wheel shaft 2. The grindstone shaft 2 is formed with an appropriate number of screw holes 5 opened at the front end surface of the taper portion 4 so as to be equally spaced around the center of the shaft center.
[0014]
In the grinding wheel 1 in the reference example, the grinding wheel layer 12 is formed on the outer peripheral surface of the thick disc-shaped grinding wheel core 11. At the center of one side surface (inner side surface) of the grindstone core 11, a boss portion 13 is formed so as to protrude from the end surface of the boss portion 13 toward the inner side in the axial direction.
[0015]
The axial length of the boss 13 and the depth of the tapered hole 14 are preferably the same or substantially the same.
When the grinding wheel 1 is mounted on the grinding wheel shaft 2, the tapered hole 14 is fitted to the tapered portion 4 at the tip of the grinding wheel shaft 2.
[0016]
A circular recess 15 is formed at the center of the other side surface (outer surface) of the grindstone core 11, and a thin portion 16 is formed by the bottom surface of the circular recess 15 and the bottom surface of the tapered hole 14.
An appropriate number of bolt holes 17 penetrating in the axial direction are formed in the thin-walled portion 16 so as to be equally spaced around the center of the shaft. When the tapered hole 14 of the grinding wheel 1 is fitted into the tapered portion 4 at the tip of the grinding wheel shaft 2, the bolt hole 17 and the screw hole 5 face each other in a coaxial relationship.
[0017]
In the grinding wheel 1, the tapered hole 14 is fitted into the tapered portion 4 at the tip of the grinding wheel shaft 2, and the mounting bolt 6 inserted into each bolt hole 17 from the bottom surface of the circular recess 15 is inserted into each screw hole 5 of the grinding wheel shaft 2. It is attached to the grindstone shaft 1 by being screwed and tightened.
By tightening the mounting bolt 6, a contact surface pressure is generated between the inner peripheral surface of the tapered hole 14 of the grindstone core 11 and the outer peripheral surface of the tapered portion 4 of the grindstone shaft 2.
[0018]
In the grinding process, the grinding wheel shaft 2 of the grinding machine is rotationally driven by a motor (not shown), and the grinding wheel 1 attached to the grinding wheel shaft 2 and rotating together with the grinding wheel shaft 2 contacts the workpiece (not shown) for grinding. Done.
At that time, the grinding wheel 1 is subjected to a force in a direction to prevent the grinding wheel shaft 6 from rotating due to the grinding resistance based on the grinding speed, the cutting amount, the feed amount, etc. applied to the grinding wheel 1, but the taper of the grinding wheel core 11 is applied. Friction is generated between the inner peripheral surface of the hole 14 and the outer peripheral surface of the tapered portion 4 of the grinding wheel shaft 2 by the contact surface pressure, and the rotational torque of the grinding wheel shaft 2 against the grinding resistance applied to the grinding wheel 1 is increased. Is transmitted to.
[0019]
When the grinding resistance overcomes the friction caused by the contact surface pressure, slip occurs between the inner peripheral surface of the tapered hole 14 of the grindstone core 11 and the outer peripheral surface of the tapered portion 4 of the grindstone shaft 2. The rotational torque of the grinding wheel shaft 2 is transmitted to the grinding wheel 1 within the limit of the grinding resistance that does not occur.
[0020]
The transmission torque at the limit of the grinding resistance at which the slip does not occur, that is, the limit torque is the friction, that is, contact between the inner peripheral surface of the tapered hole 14 of the grindstone core 11 and the outer peripheral surface of the tapered portion 4 of the grindstone shaft 2. Determined by surface pressure.
Then, centrifugal force acts on the rotating grinding wheel 1, and as a result, the grinding wheel 1, that is, the grinding stone core 11 is centrifugally expanded.
[0021]
At that time, the centrifugal force (F1, F2) acting on each part in the axial direction of the grindstone core 11 depends on the rotational speed, center of gravity radius and weight (including the grindstone layer 12, the same applies hereinafter) of each part. The centrifugal force F2 acting on the boss portion 13 is not related to the other portion of the grindstone core 11 where the grindstone layer 12 is located. Accordingly, the centrifugal force acting on the boss portion 13 having a small center of gravity radius and weight, that is, the centrifugal expansion amount is smaller than the other portions.
[0022]
As a result, the main axial range of the tapered hole 14 of the grindstone core 11 and the tapered portion 4 of the grindstone shaft 2 is in the range of the boss portion 13 having a small centrifugal expansion amount. The decrease in contact surface pressure between the inner and outer peripheral surfaces of both is small. That is, a decrease in frictional force between the inner peripheral surface of the tapered hole 14 of the grindstone core 11 and the outer peripheral surface of the tapered portion 4 of the grindstone shaft 2, that is, a decrease in limit torque is small.
As described above, in the grinding wheel 1 having a small influence on the limit torque of the centrifugal force, grinding by high-speed rotation and high-speed grinding are stably performed without problems.
[0023]
A comparative example value about the influence of rotation (ie, centrifugal force) on the contact surface pressure (ie, frictional force) between the inner circumference of the tapered hole 14 of the grindstone core 11 and the outer circumference of the tapered portion 4 of the grindstone shaft 2 is: As shown in FIGS. 5 and 6. 5 and 6, that is, the position of the tapered surface is the position in the arrow direction in FIG. 4.
[0024]
The contact surface pressure between the inner peripheral surface of the tapered hole 14 of the grindstone core 11 and the outer peripheral surface of the tapered portion 4 of the grindstone shaft 2 and the limit torque are also determined by the comparative example values of this reference example. It is clear that the difference in the influence of rotation, that is, the influence of the boss 13 is small.
[0025]
The grinding wheel 1 in the embodiment of the present invention shown in FIG. 2, there is shown in another format example in the right and left in FIG. That is, the left half shows a first example and the right half shows a second example.
The central portion of one side surface (inner side surface) of the grinding wheel core 11 of the grinding wheel 1 is tapered toward the inner side in the axial direction to be fitted to the tapered portion 4 at the tip of the grinding wheel shaft 2 when mounted on the grinding wheel shaft 2. A tapered hole 14 is formed.
[0026]
Then, on one side surface (inner side surface) of the grindstone core 11 in which the tapered hole 14 is formed, a narrow annular groove 18 or a wide width is equally formed in a radius region that is appropriately larger than the opening circumference of the tapered hole 14. An annular groove 19 is formed. The tapered hole 14, the narrow annular groove 18 and the wide annular groove 19 have the same or substantially the same depth .
[0027]
In the grinding wheel 1 in this embodiment, it rotates with respect to the contact surface pressure between the inner circumferential surface of the tapered hole 14 of the grinding wheel core 11 and the outer circumferential surface of the tapered portion 4 of the grinding wheel shaft 2, that is, the frictional force between both surfaces. The portion where the centrifugal force that sometimes affects the portion is the inner diameter portion of the narrow annular groove 18 and the wide annular groove 19 in the portion of the grindstone core 11 corresponding to both surfaces in the axial direction.
[0028]
That is, the centrifugal force acting on the grinding wheel core 11 in the outer diameter portion from the narrow annular groove 18 and the wide annular groove 19 is blocked by the narrow annular groove 18 and the wide annular groove 19, so that the inside of the tapered hole 14 of the grinding stone core 11. The contact surface pressure between the peripheral surface and the outer peripheral surface of the tapered portion 4 of the grindstone shaft 2 is not affected.
[0029]
Accordingly, the centrifugal force F2 acting on the inner diameter portion of the narrow annular groove 18 and the wide annular groove 19 having a small center of gravity radius and weight, that is, the centrifugal expansion amount is smaller than the other portions. As a result, there is little decrease in the contact surface pressure between the inner and outer peripheral surfaces due to the centrifugal force when the grinding wheel 1 rotates. That is, a decrease in frictional force between the inner peripheral surface of the tapered hole 14 of the grindstone core 11 and the outer peripheral surface of the tapered portion 4 of the grindstone shaft 2, that is, a decrease in limit torque is small. This point and the resulting actions and effects are the same as in the reference example .
[0030]
【The invention's effect】
In the grinding wheel of the present invention, when the grinding wheel is rotated during grinding, the contact surface pressure of the mounting fitting surface between the grinding wheel and the grinding wheel shaft due to the centrifugal expansion of the grinding wheel due to the centrifugal force acting on the grinding wheel is reduced. Therefore, even if the grinding wheel is rotated at a high speed, the transmission torque is reduced in the fitting between the grinding wheel and the grinding wheel shaft. There are no restrictions. That is, so-called high-speed grinding can be performed while maintaining machining accuracy.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a grinding wheel of a reference example that solves the technical problem of the present invention .
FIG. 2 is a cross-sectional view of a grinding wheel in an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a grinding wheel in the prior art.
FIG. 4 is an explanatory view showing a direction corresponding to the horizontal axis of the graphs of FIGS. 5 and 6 on the mounting tapered surface of the grinding wheel.
FIG. 5 is a performance graph of a grinding wheel in a reference example .
FIG. 6 is a performance graph of a grinding wheel in the prior art.
[Explanation of symbols]
1 grinding wheel
2 Wheel axis
3 outer peripheral step
4 Tapered part
5 Screw holes
6 bolts
11 Whetstone core
12 Whetstone layer
13 Boss
14 Taper hole
15 circular recess
16 Thin part
17 Bolt hole

Claims (1)

砥石コアの一側面において、中心にテーパ穴が形成され、前記一側面に該テーパ穴の外側に同心的に環状凹溝が形成され、前記テーパ穴と前記環状凹溝とは軸線方向深さが同一乃至略同一であり、前記テーパ穴が砥石軸の先端テーパ軸部に嵌合されて、砥石軸に取り付けられる砥石車。A taper hole is formed in the center of one side of the grindstone core, and an annular groove is formed concentrically outside the taper hole on the one side. The taper hole and the annular groove have an axial depth. A grinding wheel that is the same or substantially the same, and is attached to the grinding wheel shaft by fitting the tapered hole to the tip tapered shaft portion of the grinding wheel shaft.
JP2000294788A 2000-09-27 2000-09-27 Grinding wheel Expired - Fee Related JP4194235B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000294788A JP4194235B2 (en) 2000-09-27 2000-09-27 Grinding wheel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000294788A JP4194235B2 (en) 2000-09-27 2000-09-27 Grinding wheel

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JP4194235B2 true JP4194235B2 (en) 2008-12-10

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Country Link
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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4815674B2 (en) * 2001-01-30 2011-11-16 株式会社Ｉｈｉ Grinder wheel mounting device
JP4559094B2 (en) * 2004-02-16 2010-10-06 株式会社ディスコ Cutting blade mounting device, cutting device
JP4682592B2 (en) * 2004-11-12 2011-05-11 株式会社ジェイテクト Grinding wheel
EP2123380A4 (en) * 2007-01-09 2011-10-12 Makita Corp Rotary blade tool fixing device

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