JP3969007B2

JP3969007B2 - Truing method of grinding wheel

Info

Publication number: JP3969007B2
Application number: JP2001087308A
Authority: JP
Inventors: 雅裕井▲土▼; 明渡邉
Original assignee: JTEKT Corp
Current assignee: JTEKT Corp
Priority date: 2001-03-26
Filing date: 2001-03-26
Publication date: 2007-08-29
Anticipated expiration: 2021-03-26
Also published as: JP2002283234A

Description

【０００１】
【発明の属する技術分野】
この発明は、外周面及び側面を砥石面とした環状砥石をもつ砥石車のツルーイング方法に関する。
【０００２】
【従来の技術】
図３に示すような外周面２１及び側面２２を砥石面とした環状砥石２をもつ砥石車１を用いての側面砥石面２２による工作物の端面を研削する場合に、工作物が難削材料であったり、工作物の回転速度を高速にできない場合には、従来の技術においては、側面砥石面２２の半径方向寸法を小さくして、砥石の切れ味を向上させている。
【０００３】
【発明が解決しようとする課題】
上記のような外周面２１及び側面２２を砥石面とし、砥石の切れ味を向上させるため側面砥石面２２の半径方向寸法を小さくした環状砥石２をもつ砥石車１の場合、研削やツルーイングにより外周砥石面２１が摩耗すると、側面砥石面２２の半径方向寸法は変化して、ますます小さなる。すると、側面砥石面２２の半径方向寸法の変化により、側面砥石面２２と工作物の端面との接触面積が変化して、研削条件が外周砥石面２１の摩耗前と異なり、端面研削による加工品質も異なり、加工品質の維持が困難となる。
【０００４】
この発明は、外周面及び側面を砥石面とした環状砥石をもつ砥石車において外周砥石面が摩耗しても、側面砥石面の半径方向寸法、即ち端面研削による加工品質を一定に保つ砥石車のツルーイングを提供することを課題としている。
【０００５】
【課題を解決するための手段】
この発明がツルーイングの対象とする砥石車は、工作物の円筒外周面を研削する外周砥石面、工作物の端面を研削する軸線に垂直な側面砥石面及び側面砥石面から内周側に向って先狭まり、研削作業における外周砥石面の摩耗量と側面砥石面の摩耗量とに基づいて定められているテーパ角のテーパ凹面をもつ環状砥石とコアとを備えており、外周砥石面と側面砥石面とは直接交つてもよく、又は弧状面で接続されてもよい。
【０００６】
この発明の砥石車のツルーイング方法は、上記のような工作物の円筒外周面を研削する外周砥石面、工作物の端面を研削する軸線に垂直な側面砥石面及び側面砥石面から内周側に向って先狭まったテーパ凹面をもつ環状砥石とコアとを備えた砥石車の外周砥石面及び側面砥石面を、側面砥石面の最外周縁がツルーイングの前後において、テーパ凹面と平行な単一の仮想テーパ凹面内に常に位置するようにツルーイングする。
【０００７】
【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及びその砥石面に対するツルーイング方法を図面に従って説明する。
図１に示すように、砥石車１は、外周砥石面２１及び砥石軸に垂直な側面砥石面２２，２２とをもつ環状砥石２（例えばＣＢＮ砥石層）がボス部（図示しない）を備えた円板状のコア３の外周域に形成されて構成されている。
【０００８】
図１に示す環状砥石２は、外周砥石面２１、側面砥石面２２，２２、側面砥石面２２から内周側に向って先狭まった摺り鉢形のテーパ凹面２３，２３及び内周面２４とから形成されている。即ちその半径方向の断面形状は、外周砥石面２１と側面砥石面２２，２２がなす四辺形とその内周側のテーパ凹面２３，２３と内周面２４がなす台形とが結合した形状となっている。
【０００９】
そして、外周砥石面２１と側面砥石面２２とは直接接続されていてもよいが、図１のように適宜の弧状面２５で接続されていてもよい。即ち環状砥石２の半径方向の断面形状において外周砥石面２１と側面砥石面２２との角部は、そのままでも、又は図１のように弧状曲線部になっていてもよい。
【００１０】
環状砥石２の側面砥石面２２の半径方向寸法は、工作物の端面研削に最適な寸法にしてあり、又、環状砥石２の成形において、テーパ凹面２３のテーパ角は、通常使用における外周砥石面２１の摩耗量と側面砥石面２２の摩耗量とを勘案して定められている。即ち、側面砥石面２２の摩耗量に対する外周砥石面２１の摩耗量の比が大きい程、テーパ角は大きくなる。（対象工作物の材質・円筒面と端面の研削量に応じてテーパ角度を変えるとよい。）
環状砥石２の側面砥石面２２の最外周縁（外周砥石面２１又は弧状面２５との境界線）Ｑ_０を通り、テーパ凹面２３と平行なテーパ凹面Ｌを仮想する。
【００１１】
研削加工の結果、摩耗した環状砥石２の外周砥石面２１、側面砥石面２２及び弧状面２５のツルーイングにおいては、ツルーイング毎の外周砥石面２１、側面砥石面２２及び弧状面２５の各ツルーイング量は、各ツルーイング後の環状砥石２の側面砥石面２２の最外周縁（外周砥石面２１又は弧状面２５との境界線）Ｑn が常に仮想テーパ凹面Ｌ上にあるように設定管理される。しかも、そのためのツルーイングの切込量は、上記のような、テーパ角の設定により外周砥石面２１、側面砥石面２２及び弧状面２５において略一定でよい。
又、予め対象工作物に応じてツルーイング時のテーパ角度を設定しておいてもよい。
【００１２】
ツルーイング毎の外周砥石面２１、側面砥石面２２及び弧状面２５の各ツルーイング量は、例えば、下記の数式１で算出される図２に示す環状砥石２の半径方向断面グラフにおける座標に基づいて設定管理される。
【００１３】
【数１】

【００１４】
上記の回転駆動される砥石軸に装着された砥石車１は、砥石軸と平行な工作主軸軸線回りに回転する工作物と互に軸線方向に相対移動して、外周砥石面２１は、工作物の円筒外周面をトラバース研削し、側面砥石面２２は、工作物の端面をスラスト研削をする。その結果、各砥石面は摩耗する。又はその研削摩耗した各砥石面は、上記のようにツルーイングされて、更に摩耗する。
【００１５】
上記のように研削や全研削面への略均一のツルーイングによって各砥石面が摩耗しても、側面砥石面２２の半径方向寸法Ａは実質的に変化しない。
その結果、外周砥石面による研削、特に変化し易い側面砥石面による工作物の端面研削の加工品質は、一定に維持される。
【００１６】
【発明の効果】
この発明の砥石車のツルーイングによれば、工作物の外周面を研削する外周砥石面と工作物の端面を研削する側面砥石面とを形成した環状砥石をもつ砥石車において、両砥石面の摩耗及び研削面へのツルーイングによっても、側面砥石面の半径方向寸法、即ち、側面砥石面と工作物の端面との接触面積が実質的に一定に維持される。しかも、上記のツルーイングは、両砥石面において切込量を略均一にでき、無駄な切込みを必要としない。
その結果、外周砥石面による研削、特に変化し易い側面砥石面による工作物の端面研削の加工品質は一定に維持される。
【図面の簡単な説明】
【図１】この発明の実施の形態における砥石車の断面部分図ある。
【図２】この発明の実施の形態における砥石車の断面グラフある。
【図３】従来の技術における砥石車の説明図である。
【符号の説明】
１砥石車
２環状砥石
２１外周砥石面
２２側面砥石面
２３テーパ凹面
２４内周面
２５弧状面
３コア
Ｌ仮想テーパ凹面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a truing method for a grinding wheel having an annular grinding wheel having an outer peripheral surface and a side surface as a grinding wheel surface.
[0002]
[Prior art]
When grinding the end face of the workpiece by the side grinding wheel surface 22 using the grinding wheel 1 having the annular grinding wheel 2 having the outer circumferential surface 21 and the side surface 22 as the grinding wheel surface as shown in FIG. If the rotational speed of the workpiece cannot be increased, the conventional technique improves the sharpness of the grindstone by reducing the radial dimension of the side grindstone surface 22.
[0003]
[Problems to be solved by the invention]
In the case of the grinding wheel 1 having the annular grinding wheel 2 in which the outer circumferential surface 21 and the side surface 22 are the grinding wheel surfaces and the radial dimension of the side grinding wheel surface 22 is reduced in order to improve the sharpness of the grinding wheel, the circumferential grinding wheel is ground by grinding or truing. As the surface 21 wears, the radial dimension of the side grinding wheel surface 22 changes and becomes smaller. Then, due to the change in the radial dimension of the side grinding wheel surface 22, the contact area between the side grinding wheel surface 22 and the end surface of the workpiece changes, and the grinding conditions are different from those before the outer grinding wheel surface 21 is worn. However, it is difficult to maintain the processing quality.
[0004]
The present invention relates to a grinding wheel that maintains the radial dimension of the side surface, that is, the processing quality by end face grinding, even if the outer surface is worn in a grinding wheel having an annular grinding wheel having an outer peripheral surface and a side surface as a grinding wheel. The challenge is to provide truing.
[0005]
[Means for Solving the Problems]
A grinding wheel to which the present invention is applied is an outer peripheral grinding wheel surface for grinding a cylindrical outer peripheral surface of a workpiece, a side grinding wheel surface perpendicular to an axis for grinding an end surface of the workpiece, and an inner circumferential side from the side grinding wheel surface. An annular grindstone having a tapered concave surface with a taper angle determined based on the amount of wear on the outer peripheral grindstone surface and the amount of wear on the side grindstone surface in a grinding operation is provided. The outer grindstone surface and the side grindstone The surfaces may intersect directly or may be connected by arcuate surfaces.
[0006]
The truing method of the grinding wheel according to the present invention includes an outer peripheral grindstone surface for grinding a cylindrical outer peripheral surface of a workpiece as described above, a side grindstone surface perpendicular to an axis for grinding an end surface of the workpiece, and a lateral grindstone surface from the side grindstone surface to the inner peripheral side. The outer and side surfaces of the grinding wheel provided with a ring-shaped grinding wheel having a tapered concave surface and a core that are tapered toward the outer side and the side surface of the grinding wheel are parallel to the tapered concave surface before and after the truing. Truing so that it always lies in the concave surface of the virtual taper.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
A grinding wheel and a truing method for the grinding wheel surface according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the grinding wheel 1 includes an annular grindstone 2 (for example, a CBN grindstone layer) having a peripheral grindstone surface 21 and

side grindstone surfaces

22 and 22 perpendicular to the grindstone axis, and a boss portion (not shown). It is formed in the outer peripheral area of the disk-shaped core 3.
[0008]
An annular grindstone 2 shown in FIG. 1 includes an outer peripheral grindstone surface 21,

side grindstone surfaces

22, 22, a bowl-shaped tapered

concave surfaces

23, 23 and an inner peripheral surface 24 that narrow from the side grindstone surface 22 toward the inner peripheral side. Is formed. In other words, the cross-sectional shape in the radial direction is a shape in which a quadrangle formed by the outer peripheral grindstone surface 21 and the side

surface grindstone surfaces

22 and 22 and a trapezoid formed by the inner concave taper

concave surfaces

23 and 23 and the inner peripheral surface 24 are combined. ing.
[0009]
And although the outer peripheral grindstone surface 21 and the side grindstone surface 22 may be directly connected, they may be connected by an appropriate arcuate surface 25 as shown in FIG. That is, in the radial cross-sectional shape of the annular grindstone 2, the corner portions of the outer peripheral grindstone surface 21 and the side grindstone surface 22 may be left as they are or may be arcuate curved portions as shown in FIG.
[0010]
The radial dimension of the side grindstone surface 22 of the annular grindstone 2 is set to an optimum dimension for end-face grinding of the workpiece, and the taper angle of the tapered concave surface 23 in forming the annular grindstone 2 is the outer peripheral grindstone surface in normal use. The amount of wear 21 and the amount of wear of the side grinding wheel surface 22 are taken into consideration. In other words, the taper angle increases as the ratio of the wear amount of the outer peripheral grindstone surface 21 to the wear amount of the side grindstone surface 22 increases. (The taper angle may be changed according to the material of the target workpiece and the grinding amount of the cylindrical surface and end surface.)
Through Q ₀ (boundary line between the outer circumferential grinding surface 21 or arcuate surface 25) outermost peripheral edge of the side grinding wheel surface 22 of the annular grinding wheel 2, to a virtual parallel tapered concave surface L and taper concave 23.
[0011]
In the truing of the outer peripheral grindstone surface 21, the side grindstone surface 22 and the arcuate surface 25 of the annular grindstone 2 worn as a result of grinding, the respective truing amounts of the outer peripheral grindstone surface 21, the side grindstone surface 22 and the arcuate surface 25 for each truing are as follows. The outermost peripheral edge (boundary line with the outer peripheral grindstone surface 21 or the arcuate surface 25) Qn of the side grindstone surface 22 of the annular grindstone 2 after each truing is set and managed so that it is always on the virtual tapered concave surface L. In addition, the truing cut amount for that purpose may be substantially constant on the outer peripheral grinding wheel surface 21, the side grinding wheel surface 22, and the arcuate surface 25 by setting the taper angle as described above.
Further, the taper angle during truing may be set in advance according to the target workpiece.
[0012]
Each truing amount of the outer peripheral grindstone surface 21, the side grindstone surface 22 and the arcuate surface 25 for each truing is set based on, for example, the coordinates in the radial cross-sectional graph of the annular grindstone 2 shown in FIG. Managed.
[0013]
[Expression 1]

[0014]
The grinding wheel 1 mounted on the rotationally driven grinding wheel shaft moves relative to the workpiece rotating about the work spindle axis parallel to the grinding wheel shaft in the axial direction. The outer circumferential surface of the cylinder is traverse-ground, and the side grinding wheel surface 22 thrust-grinds the end surface of the workpiece. As a result, each grindstone surface is worn. Alternatively, each grindstone surface that has been worn by grinding is trued as described above and further worn.
[0015]
As described above, even if each grinding wheel surface is worn by grinding or substantially uniform truing on all grinding surfaces, the radial dimension A of the side grinding wheel surface 22 does not substantially change.
As a result, the processing quality of the grinding by the outer peripheral grinding wheel surface, particularly the end grinding of the workpiece by the side grinding wheel surface that is easily changed is maintained constant.
[0016]
【The invention's effect】
According to the truing of the grinding wheel of the present invention, in the grinding wheel having the annular grinding wheel formed with the outer circumferential grinding wheel surface for grinding the outer circumferential surface of the workpiece and the side grinding wheel surface for grinding the end surface of the workpiece, the wear of both grinding wheel surfaces Also by truing to the grinding surface, the radial dimension of the side grinding wheel surface, that is, the contact area between the side grinding wheel surface and the end surface of the workpiece is maintained substantially constant. In addition, the above truing can make the cutting amount substantially uniform on both grinding wheel surfaces, and does not require useless cutting.
As a result, the processing quality of the grinding by the outer peripheral grinding wheel surface, particularly the end grinding of the workpiece by the side grinding wheel surface which is easily changed is maintained constant.
[Brief description of the drawings]
FIG. 1 is a partial sectional view of a grinding wheel according to an embodiment of the present invention.
FIG. 2 is a cross-sectional graph of a grinding wheel according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram of a grinding wheel in the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Grinding wheel 2 Annular grindstone 21 Outer periphery grindstone surface 22 Side surface grindstone surface 23 Tapered concave surface 24 Inner circumferential surface 25 Arc-shaped surface 3 Core L Virtual taper concave surface

Claims

工作物の円筒外周面を研削する外周砥石面、工作物の端面を研削する軸線に垂直な側面砥石面及び側面砥石面から内周側に向って先狭まったテーパ凹面をもつ環状砥石とコアとを備えた砥石車の外周砥石面及び側面砥石面を、側面砥石面の最外周縁がツルーイングの前後において、テーパ凹面と平行な単一の仮想テーパ凹面内に常に位置するようにツルーイングする砥石車のツルーイング方法。 An outer peripheral grindstone surface for grinding the cylindrical outer peripheral surface of the workpiece, a side grindstone surface perpendicular to the axis for grinding the end surface of the workpiece, and an annular grindstone having a tapered concave surface tapered from the side grindstone surface toward the inner peripheral side, and a core A grinding wheel for truing the outer and side grindstone surfaces of a grindstone provided with a wheel so that the outermost peripheral edge of the side grindstone surface is always located in a single virtual tapered concave surface parallel to the tapered concave surface before and after truing. Truing method.