JP3988400B2

JP3988400B2 - Truing method of grinding wheel for end grinding

Info

Publication number: JP3988400B2
Application number: JP2001082121A
Authority: JP
Inventors: 智行春日; 隆行吉見; 吉宏水谷; 良平向井; 義信四井
Original assignee: JTEKT Corp
Current assignee: JTEKT Corp
Priority date: 2001-03-22
Filing date: 2001-03-22
Publication date: 2007-10-10
Anticipated expiration: 2021-03-22
Also published as: JP2002283235A

Description

【０００１】
【発明の属する技術分野】
この発明は、端面研削砥石車のツルーイング方法に関する。
【０００２】
【従来の技術】
ストレート型の砥石車の側面を砥石面とし、工作物の端面を研削面として研削する端面研削の場合、通常の円筒研削（線接触）と較べて、砥石車の側面砥石面と工作物の研削面との接触面積が広いこと及び砥石車の側面砥石面と工作物の研削面との間に研削油液が入り難いことのために研削焼けが生じ易いという問題がある。
【０００３】
従来の技術においては、カップ形のツルアーの端面を砥石車の側面に当てて、砥石車とツルアーとの周速比を大きくとって、砥粒の破砕に近い状態でのドレッシングを行なうことにより、砥石車の切れ刃の鋭利化による研削抵抗の低減及び砥粒の突出量増大による砥石車の側面砥石面・工作物の研削面間への研削油液浸入の容易化を図り、それによって工作物の端面研削における研削焼けを防止をしている。
【０００４】
【発明が解決しようとする課題】
ストレート型の砥石車の側面を砥石面として工作物の端面を研削面としての端面研削における研削焼け防止に対する従来の技術の上記のドレッシング対策は、砥石車の側面砥石面と工作物の端面との半径方向の相対移動で行われる所謂プランジ研削においては、有効ではあるが、砥石車の側面砥石面と工作物の端面とが軸線方向に対向して接近する所謂スラスト研削においては、余り効果がない。
この発明は、ストレート型の砥石車の側面砥石面のスラスト研削による端面研削においても、研削焼け防止に有効な対策としての砥石車の側面砥石面のツルーイングを提案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】
この発明の砥石車ツルーイング方法は、砥石車の側面砥石面に対し軸線回りの回転軌跡を画く溝を形成するのであり、次のような諸形式がある。
（１）回転する砥石車の側面砥石面とそれに接触するツルアーとの半径変化方向の相対変位による平坦ツルーイング中の相対変位一時停止により側面砥石面に溝を形成する。
【０００６】
（２）回転する砥石車の側面砥石面とそれに接触するツルアーとの半径変化方向の相対変位による平坦ツルーイング中の相対変位一時停止において側面砥石面に対するツルアーの切込みにより砥石面に溝を形成する。
（３）回転する砥石車の側面砥石面とそれに接触するツルアーとの半径変化方向の相対変位による平坦ツルーイング後、側面砥石面に対し軸線回りの回転軌跡における側面砥石面に対するツルアーの切込みにより側面砥石面に溝を形成する。
【０００７】
そして、上記の溝を形成する方法では、形成する溝の深さを次回行われる溝成形ツルーイングまでの間における砥石車の側面砥石面摩耗量より大きくとり、砥石車の外周砥石面に隣接した溝と外周砥石面との半径方向間隔を次回行われる溝成形ツルーイングまでの間における砥石車の外周砥石面摩耗量よりより大きくとるのである。
【０００８】
又、上記の方法で形成する溝は、適宜数の同心円、又は螺旋である。
上記の方法でツルーイングされた側面砥石面によるスラスト研削、即ち工作物の端面研削において、研削箇所に供給された研削油液は、溝の開放口から溝内に流入し、溝中に保持されて且つ流出し、研削面の冷却や研削屑の排出を行い、側面砥石面と溝の側面との交線部は切刃となって研削作用に寄与する。
【０００９】
【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の側面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。
砥石車の側面砥石面に対するツルーイングを行うツルーイング装置は、例えば、図１に示すように研削盤に設けられている。
【００１０】
研削盤（円筒研削盤を例示する）は、ベッド１上には、サーボモータ２により駆動されるねじ機構を介して前後方向（Ｘ軸線方向）の案内３に案内されて進退するようになっている砥石台４とサーボモータ５により駆動されるねじ機構を介して左右方向（Ｚ軸線方向）の案内６に案内されて移動するようになっているテーブル７とが設けられており、砥石台４には、砥石駆動モータ８で図示しないベルト伝動機構を介してＺ軸線回りに回転される砥石軸が軸受され、その先端には砥石車９が取り付けられている。
【００１１】
テーブル７には、図示しない主軸駆動モータで回転駆動される工作主軸を備えた工作主軸台１０と心押しセンタが装着された心押台１１とが載置されている。
工作主軸と心押しセンタとはＺ軸線方向に対向し、工作主軸と心押しセンタとに両端が保持された工作物Ｗは、工作主軸によりＺ軸線回りに回転駆動されるようになっている。
更に、テーブル７の一方の端部（図示の例では工作主軸台１０）には、ツルーイング装置１２が設けられている。
【００１２】
ツルーイング装置１２は、本体１２ａに支持され、ツルアー駆動モータで回転駆動されるＸ軸線方向の回転軸の砥石台側に向う先端に取り付けられているディスク状のダイヤモンドツルア１３を備えている。
【００１３】
サーボモータ２、サーボモータ５、砥石駆動モータ８、主軸駆動モ−タ及びツルア駆動モータは、適宜の制御装置１４により制御されるようになっている。従って、砥石台４及びテーブル７の送り速度及び送り量、即ち位置、並びに砥石車９及びダイヤモンドツルア１３の回転速度は、制御装置１４により制御される。
【００１４】
研削する砥石車９の側面、即ち側面砥石面９１及び研削される工作物Ｗの端面、即ち研削面は、前後方向軸線（Ｘ軸線）と上下方向軸線（Ｙ軸線）を含む平面内にあり、ディスク状のダイヤモンドツルア１３は、左右方向軸線（Ｚ軸線）と上下方向軸線（Ｙ軸線）を含む平面内にある。
そして、上記のツルーイング装置１２により、砥石車９の側面砥石面９１に対し、軸線回りの回転軌跡を画く溝、即ち浅い円周溝１５、深い円周溝１６又は螺旋溝１７が形成されるようにツルーイングが行われる。
【００１５】
この発明の実施の第１形態におけるスラスト研削を行う側面砥石面９１に対するツルーイングは、次のように行われる。（図２（Ａ）参照）
（１）テーブル７が待機位置からＺ軸線方向に送られ、ダイヤモンドツルア１３の外周面が砥石車９の側面砥石面９１を含む平面と交り、所定の切込量だけ突出した位置に位置決めされる。
【００１６】
（２）そして、砥石台４がＸ軸方向に前進させられると、側面砥石面９１は、ダイヤモンドツルア１３の外周面に接触して、外周側から所定の切込量でツルーイングされ、前進する側面砥石面の外周から所定距離の位置Ａ、即ち所定の半径位置がダイヤモンドツルア１３に達した位置を第１停止位置とし、その位置で砥石台４、即ち砥石車９の前進が停止される。例えば、０．１秒の停止で、約２μｍの深さの浅い円周溝１５が側面砥石面９１に形成される。
【００１７】
（３）次いで、砥石台４、即ち砥石車９は、一時停止の後、そのまま砥石台４がＸ軸方向に所定距離だけ次の所定位置まで前進させられると、前回と同様に、側面砥石面９１は中心に向って所定の切込量でツルーイングされ、前進する側面砥石面の外周から第２の所定距離の位置Ｂ、即ち第２の所定半径位置がダイヤモンドツルア１３に達した位置を第２停止位置とし、その位置で砥石台４、即ち砥石車９の前進が停止される。
【００１８】
（４）そして前回と同様に砥石車９の一時停止により、側面砥石面９１には、前回の円周溝１５と同じような浅い円周溝１５が同心円として形成される。
（５）上記のような側面砥石面９１に対する側面砥石面９１に沿った半径方向のツルーイングと円周溝形成とが適宜回数（図示の例では３回）繰り返えされ、側面砥石面９１に沿った半径方向のツルーイングが側面砥石面９１の内周に達すると、砥石台４の前進は停止されると共に、テーブル７、即ちダイヤモンドツルア１３は、砥石台４、即ち砥石車９から離れるようにＺ軸線方向に送られ、待機位置に戻る。そして、砥石台４も待機位置にまでＸ軸線方向に戻される。
【００１９】
この発明の実施の第２形態におけるスラスト研削を行う側面砥石面９１に対するツルーイングは、次のように行われる。（図２（Ａ）参照）
（１）側面砥石面９１の内周面がダイヤモンドツルア１３より前方になるまで、砥石台４がＸ軸方向に前進させられる。そして、テーブル７が待機位置からＺ軸線方向に送られ、ダイヤモンドツルア１３の外周面が砥石車９の側面砥石面９１を含む平面と交り、所定の切込量だけ突出した位置に位置決めされる。
【００２０】
（２）そして、砥石台４がＸ軸方向に後退させられると、側面砥石面９１は、ダイヤモンドツルア１３の外周面に接触して、内周側から所定の切込量でツルーイングされ、側面砥石面の外周から所定距離の位置Ｃ、即ち所定の半径位置がダイヤモンドツルア１３に達した位置を第１停止位置とし、その位置で砥石台４、即ち砥石車９の後退が停止される。例えば、０．１秒の停止で、約２μｍの深さの浅い円周溝１５が側面砥石面９１に形成される。
【００２１】
（３）次いで、砥石台４、即ち砥石車９は、一時停止の後、そのまま砥石台４がＸ軸方向に所定距離だけ次の所定位置まで後退させられると、前回と同様に、側面砥石面９１は中心に向って所定の切込量でツルーイングされ、後退する側面砥石面の外周から第２の所定距離の位置Ｂ、即ち第２の所定半径位置がダイヤモンドツルア１３に達した位置を第２停止位置とし、その位置で砥石台４、即ち砥石車９の後進が停止される。
【００２２】
（４）そして前回と同様に砥石車９の一時停止により、側面砥石面９１には、前回の円周溝１５と同じような浅い円周溝１５が同心円として形成される。
（５）上記のような側面砥石面９１に対する側面砥石面９１に沿った半径方向のツルーイングと円周溝形成とが適宜回数（図示の例では３回）繰り返えされ、側面砥石面９１に沿った半径方向のツルーイングが側面砥石面９１の外周に達すると、砥石台４の後退は停止されると共に、テーブル７、即ちダイヤモンドツルア１３は、砥石台４、即ち砥石車９から離れるようにＺ軸線方向に送られ、待機位置に戻る。そして、砥石台４も待機位置にまでＸ軸線方向に戻される。
【００２３】
この発明の実施の第３形態におけるスラスト研削を行う側面砥石面９１に対するツルーイングは、次のように行われる。（図２（Ｂ）参照）
（１）テーブル７が待機位置からＺ軸線方向に送られ、ダイヤモンドツルア１３の外周面が砥石車９の側面砥石面９１を含む平面と交り、所定の切込量だけ突出した位置に位置決めされる。
【００２４】
（２）そして、砥石台４がＸ軸方向に前進させられると、側面砥石面９１は、ダイヤモンドツルア１３の外周面に接触して、外周側から所定の切込量でツルーイングされ、前進する側面砥石面の外周から所定距離の位置Ａ、即ち所定の半径位置がダイヤモンドツルア１３に達した位置を第１停止位置とし、その位置で砥石台４、即ち砥石車９の前進が停止される。
【００２５】
（３）次いで、テーブル７、即ちダイヤモンドツルア１３が更に砥石車９に向ってＺ軸線方向に所定距離だけ進められると、ダイヤモンドツルア１３の外周域は、砥石車９の側面砥石面９１を所定量切込み、切込量に応じた深さの円周溝１６が側面砥石面９１に形成される。円周溝１６の断面は、底幅がダイヤモンドツルア１３の厚さｄに略対応し、内側面で側面砥石面９１に対し垂直線となり、外側面では楕円となり、開口側の幅がダイヤモンドツルア１３の厚さより広くなる。
【００２６】
（４）再び、テーブル７、即ちダイヤモンドツルア１３が元のＺ軸線方向位置にまで戻されてから、砥石台４がＸ軸方向に所定距離だけ次の所定位置まで前進させられると、前回と同様に、側面砥石面９１は中心に向って所定の切込量でツルーイングされ、前進する側面砥石面の外周から第２の所定距離の位置Ｂ、即ち第２の所定半径位置がダイヤモンドツルア１３に達した位置を第２停止位置とし、その位置で砥石台４、即ち砥石車９の前進が停止される。
【００２７】
（５）そして前回と同様にダイヤモンドツルア１３の外周域は、Ｚ軸線方向に所定量だけ進み、砥石車９の側面砥石面９１を所定量切込み、側面砥石面９１には、前回の円周溝１６と同じような深い円周溝１６が同心円として形成される。
【００２８】
（６）上記のような側面砥石面９１に対する側面砥石面９１に沿った半径方向のツルーイングと円周溝形成とが適宜回数（図示の例では３回）繰り返えされ、側面砥石面９１に沿った半径方向のツルーイングが側面砥石面９１の内周に達すると、砥石台４の前進は停止されると共に、テーブル７、即ちダイヤモンドツルア１３は、砥石台４、即ち砥石車９から離れるようにＺ軸線方向に送られ、待機位置に戻る。そして、砥石台４も待機位置にまでＸ軸線方向に戻される。
【００２９】
この発明の実施の第４形態におけるスラスト研削を行う側面砥石面９１に対するツルーイングは、次のように行われる。（図２（Ｂ）参照）
（１）テーブル７が待機位置からＺ軸線方向に送られ、ダイヤモンドツルア１３の外周面が砥石車９の側面砥石面９１を含む平面と交り、所定の切込量だけ突出した位置に位置決めされる。
【００３０】
（２）そして、砥石台４がＸ軸方向に前進させられると、側面砥石面９１は、ダイヤモンドツルア１３の外周面に接触して、外周側から所定の切込量でツルーイングされ、側面砥石面９１に沿った半径方向のツルーイングが側面砥石面９１の内周に達すると、砥石台４の前進は停止される。
【００３１】
（３）次いで、そのまま、砥石台４、即ち砥石車９は、Ｘ軸方向に後退させられ、側面砥石面の外周から所定距離の位置Ｃ、即ち所定の半径位置がダイヤモンドツルア１３に達した位置を第１停止位置として停止する。
【００３２】
（４）次いで、テーブル７、即ちダイヤモンドツルア１３が更に砥石車９に向ってＺ軸線方向に所定距離だけ進められると、ダイヤモンドツルア１３の外周域は、砥石車９の側面砥石面９１を所定量切込み、切込量に応じた深さで、実施の第３形態と同様の断面の円周溝１６が側面砥石面９１に形成される。
【００３３】
（５）再び、テーブル７、即ちダイヤモンドツルア１３が元のＺ軸線方向位置にまで戻されてから、砥石台４がＸ軸方向に所定距離だけ次の所定位置まで後退させられ、後退する側面砥石面の外周から第２の所定距離の位置Ｂ、即ち第２の所定半径位置がダイヤモンドツルア１３に達した位置を第２停止位置とし、その位置で砥石台４、即ち砥石車９の後退が停止される。
【００３４】
（６）そして前回と同様にダイヤモンドツルア１３の外周域は、Ｚ軸線方向に所定量だけ進み、砥石車９の側面砥石面９１を所定量切込み、側面砥石面９１には、前回の円周溝１６と同じような円周溝１６が同心円として形成される。
【００３５】
（７）上記のような砥石台４のＸ軸方向に所定距離だけの後退と円周溝形成とが適宜回数（図示の例では３回）繰り返えされ、最後の円周溝形成におけるテーブル７、即ちダイヤモンドツルア１３の戻りにおいて、テーブル７、即ちダイヤモンドツルア１３は、砥石台４、即ち砥石車９から離れて待機位置に戻る。そして、砥石台４も待機位置にまでＸ軸線方向に戻される。
【００３６】
この発明の実施の第５形態におけるスラスト研削を行う側面砥石面９１に対するツルーイングは、次のように行われる。（図（Ｃ）参照）
（１）テーブル７が待機位置からＺ軸線方向に送られ、ダイヤモンドツルア１３の外周面が砥石車９の外周で砥石車９の側面砥石面９１を含む平面と交り、所定の切込量だけ突出した位置に位置決めされる。
【００３７】
（２）そして、砥石台４がＸ軸方向に前進させられると、側面砥石面９１は、ダイヤモンドツルア１３の外周面に接触して、外周側から所定の切込量で側面砥石面９１を平面化するツルーイングが施され、側面砥石面９１に沿った半径方向のツルーイングが側面砥石面９１の内周に達すると、砥石台４の前進は停止される。
【００３８】
（３）次いで、そのまま、砥石台４、即ち砥石車９は、Ｘ軸方向に後退させられ、側面砥石面の外周から所定距離の位置Ｃ、即ち所定の半径位置がダイヤモンドツルア１３に達した位置を第１停止位置として停止する。
【００３９】
（４）次いで、テーブル７、即ちダイヤモンドツルア１３が更に砥石車９に向ってＺ軸線方向に所定微小距離だけ進められると、ダイヤモンドツルア１３の外周域は、位置Ｃ（第１停止位置）で砥石車９の側面砥石面９１を所定微小量切込まれる。それと同時に、砥石車９の１回転に要する時間に、少なくともダイヤモンドツルア１３の厚みより大きな距離を移動する速度（速度Ｖ＞ダイヤモンドツルア１３の厚みｄ／砥石車の１回転の時間ｔ）で、砥石台４、即ち砥石車９は、側面砥石面の外周から所定距離の位置Ａ、即ち所定の半径位置がダイヤモンドツルア１３に達するまでＸ軸方向に後退させられる。
それにより、側面砥石面９１には、微小切込み深さの螺旋溝１７が形成される。
【００４０】
（５）砥石台４、即ち砥石車９は、側面砥石面の外周から所定距離の位置Ａ、即ち所定の半径位置がダイヤモンドツルア１３に達すると、砥石台４、即ち砥石車９は、停止し、テーブル７、即ちダイヤモンドツルア１３は、砥石台４、即ち砥石車９から離れて待機位置にまでＺ軸線方向にされ、砥石台４も待機位置にまでＸ軸線方向に戻される。
【００４１】
この発明の実施の第６形態におけるスラスト研削を行う側面砥石面９１に対するツルーイングは、次のように行われる。（図（Ｃ）参照）
（１）側面砥石面９１の内周面がダイヤモンドツルア１３より前方になるまで、砥石台４がＸ軸方向に前進させられる。そして、テーブル７が待機位置からＺ軸線方向に送られ、ダイヤモンドツルア１３の外周面が砥石車９の側面砥石面９１を含む平面と交り、所定の切込量だけ突出した位置に位置決めされる。
【００４２】
（２）そして、砥石台４がＸ軸方向に後進させられると、側面砥石面９１は、ダイヤモンドツルア１３の内周面に接触して、内周側から所定の切込量でツルーイングされ、側面砥石面９１に沿った半径方向のツルーイングが側面砥石面９１の外周に達すると、砥石台４の後進は停止される。
【００４３】
（３）次いで、そのまま、砥石台４、即ち砥石車９は、Ｘ軸方向に前進させられ、側面砥石面の外周から所定距離の位置Ａ、即ち所定の半径位置がダイヤモンドツルア１３に達した位置を第１停止位置として停止する。
【００４４】
（４）次いで、テーブル７、即ちダイヤモンドツルア１３が更に砥石車９に向ってＺ軸線方向に所定微小距離だけ進められると、ダイヤモンドツルア１３の外周域は、砥石車９の側面砥石面９１を所定微小量切込まれる。それと同時に、砥石車９の一回転中に、少なくともダイヤモンドツルア１３の厚みより大きな距離を移動する速度で、砥石台４、即ち砥石車９は、側面砥石面の外周から所定距離の位置Ｃ、即ち所定の半径位置がダイヤモンドツルア１３に達するまでＸ軸方向に前進させられる。
それにより、側面砥石面９１には、微小切込み深さの螺旋溝１７が形成される。
【００４５】
（５）砥石台４、即ち砥石車９は、側面砥石面の外周から所定距離の位置、即ち所定の半径位置がダイヤモンドツルア１３に達すると、砥石台４、即ち砥石車９は、停止し、テーブル７、即ちダイヤモンドツルア１３は、砥石台４、即ち砥石車９から離れて待機位置にまでＺ軸線方向にされ、砥石台４も待機位置にまでＸ軸線方向に戻される。
【００４６】
上記の各実施の形態は、図２及び図３においては左側の側面砥石面９１が例示されているが、右側の側面砥石面９１についても同様にツルーイングが行われることは容易に理解できる。
【００４７】
そして、端面研削により砥石車が摩耗して、砥石車の側面、即ち側面砥石面に形成された溝が浅くなり、その性能が所定値以下に減少した場合には、再度、側面砥石面に対して再生溝成形ツルーイングする。
即ち、溝成形ツルーイング直後から次の再生溝成形ツルーイングまで間隔を基準とすれば、その間の端面研削による砥石の摩耗量よりも溝の深さが大きくなるように溝成形ツルーイングを行う。
【００４８】
又、その間の端面研削以外の砥石車の外周砥石面を使用しての研削による砥石の摩耗量よりも外周面から最外周側の溝までの寸法が大きくなるように最外周側の溝の位置、即ち位置Ａは定められる。
そして、再生溝成形ツルーイングにおいては、砥石車の側面砥石面に対する平坦面のツルーイングは、残存する溝を除去し、側面砥石面が平坦になるような切込量とする。
【００４９】
又、実施の第３形態及び第４形態（図２（Ｂ））においては、最初のツルーイング時に側面砥石面が寿命に至るよりも深く溝を形成しておくことにより、２度目以降のツルーイングでは、最初に形成した溝が残っているため溝形成の工程が不必要となり、従来と同様に側面砥石面を一様にツルーイングするだけで済む。
【００５０】
上記のようにして各実施の形態のツルーイング方法により側面砥石面がツルーイングされた砥石車をもって工作物に対し端面研削が行われる。即ち、制御装置１４により、サーボモータ２、サーボモータ５、主軸駆動モータ及び砥石駆動モータ８が回転制御される。
【００５１】
例えば、図１に示すようなフランジ部と軸部とからなる工作物Ｗに対する研削加工において、図示の待機位置にあるテーブル７、即ち回転する工作物Ｗに対し、図示の待機位置にある砥石台４、即ち回転する砥石車９がＸ軸線方向に前進し、砥石車９の外周砥石面が工作物Ｗの軸部に対し所定量の切込みをして砥石台４は停止する。
【００５２】
そして、テーブル７がＺ軸線方向、図示右方に送られる。それにより、工作物Ｗの軸部が砥石車９の外周砥石面によりトラバース研削されながら、工作物Ｗのフランジ部、即ち研削面は、砥石車９の上記のようにツルーイングされた側面砥石面９１に接近する。やがて、工作物Ｗのフランジ部、即ち研削面は、側面砥石面９１当接し、所定量切込まれる結果、工作物Ｗの端面は、砥石車９の側面砥石面９１によりスラスト研削されるのである。
【００５３】
その際には、研削箇所に供給された研削油液は、浅い円周溝１５・・・、深い円周溝１６・・・又は螺旋溝１７の開放口から溝内に流入し易く、溝中に保持されて且つ流出するので、研削面の冷却や研削屑の排出が十分となり、又、側面砥石面９１と各溝の側面との交線部は切刃となって研削抵抗の低減に寄与するので、その結果、研削焼けは防止される。
【００５４】
又、上記の実施の形態において、先に従来通りに側面砥石面をツルアによる複数回のトラバースによりツルーイングした後、ツルアにより上記の実施の形態における溝形成加工を行ってもよい。
砥石車の外周砥石面が研削により摩耗していくと、最外周部の溝が形成出来なくなってしまうため、接触検知等により砥石車の外周砥石面を検知した後、この外周砥石面を基準として所定間隔（例えばツルア幅の１〜２倍）で溝を形成するようにしてもよい。そして、溝数は、砥石幅、ツルア幅、溝間隔から演算により求める。
【００５５】
又、この発明は、端面スラスト研削を想定したものであるが、工作物のフランジ部に対して平行（Ｘ軸）に砥石車を前進させて、フランジ部を外周側からプランジ研削する研削方法にも適用してもよい。
クーラントによる冷却効率が高まるため、研削焼け防止が図れ、更に、研削能率を向上させることも可能となる。特に、フランジ部の半径長さが長い場合には、一層効果的である。
【００５６】
【発明の効果】
この発明の端面研削用砥石車のツルーイング方法によりツルーイングされた砥石車により端面研削を行う場合には、砥石車の側面砥石面に溝が形成され、砥石面と工作物の端面、即ち研削面は同心関係になく、工作物の研削面は、側面砥石面の範囲内にあるため、研削箇所に供給された研削油液は、溝の開放口から溝内に流入し易く、溝中に保持されて且つ流出するので、研削面の冷却や研削屑の排出が十分となり、又、側面砥石面と各溝の側面との交線部は切刃となって研削抵抗の低減に寄与するので、その結果、研削焼けは防止される。
又、研削条件に応じて任意の溝を形成することができる。
【図面の簡単な説明】
【図１】この発明の実施の形態における端面研削用砥石車のツルーイング方法を行うツルーイング装置を具備した円筒研削盤の平面図である。
【図２】この発明の実施の形態における端面研削用砥石車のツルーイング方法の説明図である。
【符号の説明】
１ベッド
２，５サーボモータ
３，６案内
４砥石台
７テーブル
８砥石駆動モータ
９砥石車
９１側面砥石面
１０工作主軸台
１１心押台
１２ツルーイング装置
１２ａ本体
１３ダイヤモンドツルア
１４制御装置
１５浅い円周溝
１６深い円周溝
１７螺旋溝
Ｗ工作物[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a truing method for an end surface grinding wheel.
[0002]
[Prior art]
In the case of end grinding where the side of a straight type grinding wheel is the grinding wheel and the end face of the workpiece is ground, the grinding of the side grinding wheel surface and the workpiece of the grinding wheel compared to normal cylindrical grinding (line contact) There is a problem that grinding burn is likely to occur because the contact area with the surface is wide and the grinding oil liquid is difficult to enter between the side grinding wheel surface of the grinding wheel and the grinding surface of the workpiece.
[0003]
In the prior art, by applying the dressing in a state close to the crushing of the abrasive grains by placing the end face of the cup-shaped truer on the side surface of the grinding wheel, taking a large peripheral speed ratio between the grinding wheel and the truer, Reduction of grinding resistance by sharpening the cutting edge of the grinding wheel and increase of protrusion of abrasive grains facilitates the infiltration of grinding fluid between the grinding wheel side surface and workpiece grinding surface. This prevents grinding burn in end face grinding.
[0004]
[Problems to be solved by the invention]
The above-mentioned dressing measures of the prior art for the prevention of grinding burn in end face grinding with the side surface of a straight type grinding wheel as the grinding wheel surface and the end surface of the workpiece as the grinding surface are the same as the grinding wheel side surface of the grinding wheel and the end surface of the workpiece. in so-called plunge grinding performed in a relative movement in the radial direction, while effective, in the so-called thrust grinding the side surface grinding surface of the grinding wheel and the end face of the workpiece approaches to face in the axial direction, very ineffective .
An object of the present invention is to propose truing of a side grinding wheel surface of a grinding wheel as an effective measure for preventing grinding burn even in end grinding by thrust grinding of a side grinding wheel surface of a straight type grinding wheel.
[0005]
[Means for Solving the Problems]
The grinding wheel truing method of the present invention forms a groove that forms a rotation locus around an axis with respect to the side grinding wheel surface of the grinding wheel, and has the following various forms.
(1) Grooves are formed on the side grinding wheel surface by temporarily suspending relative displacement during flat truing due to the relative displacement in the radial direction between the side grinding wheel surface of the rotating grinding wheel and the truer in contact therewith.
[0006]
(2) A groove is formed in the grindstone surface by cutting the trough with respect to the side grindstone surface in the relative displacement temporary stop during flat truing due to the relative displacement in the radial direction between the side grindstone surface of the rotating grindstone wheel and the truer in contact therewith.
(3) After flat truing by relative displacement in the radial direction between the side grinding wheel surface of the rotating grinding wheel and the truer that contacts the side grinding wheel, the side grinding wheel is cut by cutting the side grinding wheel with respect to the side grinding wheel surface in the rotational trajectory around the axis. Grooves are formed on the surface.
[0007]
Then, in the method of forming the groove, the depth of the groove to be formed is larger than the side wheel surface wear amount of the grinding wheel until the next groove forming truing , and the groove adjacent to the outer peripheral grinding wheel surface of the grinding wheel The radial distance between the wheel and the outer peripheral grinding wheel surface is larger than the amount of wear on the outer peripheral grinding wheel surface of the grinding wheel until the next groove forming truing .
[0008]
Moreover, the groove | channel formed with said method is an appropriate number of concentric circles, or a spiral.
In the thrust grinding by the side grinding wheel surface trued by the above method, that is, the end grinding of the workpiece, the grinding fluid supplied to the grinding point flows into the groove from the opening of the groove and is held in the groove. In addition, it flows out, cools the grinding surface and discharges grinding waste, and the intersecting line portion between the side surface of the grindstone and the side surface of the groove becomes a cutting edge and contributes to the grinding action.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A truing method for a side grinding wheel surface of a grinding wheel according to an embodiment of the present invention will be described with reference to the drawings.
A truing device that performs truing on a side grinding wheel surface of a grinding wheel is provided, for example, in a grinding machine as shown in FIG.
[0010]
A grinder (cylindrical grinder is exemplified) is advanced and retracted on a bed 1 by being guided by a guide 3 in the front-rear direction (X-axis direction) via a screw mechanism driven by a servo motor 2. There are provided a grinding wheel base 4 and a table 7 which is guided and moved by a guide 6 in the left and right direction (Z-axis direction) via a screw mechanism driven by a servo motor 5. A grinding wheel shaft that is rotated around the Z-axis by a grinding wheel drive motor 8 via a belt transmission mechanism (not shown) is bearing, and a grinding wheel 9 is attached to the tip thereof.
[0011]
Mounted on the table 7 are a work spindle stock 10 having a work spindle that is rotationally driven by a spindle drive motor (not shown) and a tailstock 11 on which a tailstock center is mounted.
The work spindle and the centering center are opposed to each other in the Z-axis direction, and the workpiece W having both ends held by the work spindle and the centering center is rotationally driven around the Z-axis by the work spindle.
Furthermore, a truing device 12 is provided at one end of the table 7 (in the illustrated example, the work spindle 10).
[0012]
The truing device 12 includes a disk-like diamond truer 13 that is supported by the main body 12a and attached to the tip of the rotation axis in the X-axis direction that is rotationally driven by a truer drive motor.
[0013]
The servo motor 2, the servo motor 5, the grindstone drive motor 8, the spindle drive motor, and the truer drive motor are controlled by an appropriate control device 14. Accordingly, the feed speed and feed amount of the grinding wheel platform 4 and the table 7, that is, the position, and the rotational speed of the grinding wheel 9 and the diamond truer 13 are controlled by the control device 14.
[0014]
The side surface of the grinding wheel 9 to be ground, that is, the side surface of the grinding wheel 91 and the end surface of the workpiece W to be ground, that is, the grinding surface, are in a plane including the longitudinal axis (X axis) and the vertical axis (Y axis). The disk-shaped diamond truer 13 is in a plane including a left-right axis (Z-axis) and a vertical-axis (Y-axis).
Then, the truing device 12 forms a groove that forms a rotation locus around the axis with respect to the side grinding wheel surface 91 of the grinding wheel 9, that is, a shallow circumferential groove 15, a deep circumferential groove 16, or a spiral groove 17. Truing is performed.
[0015]
Truing with respect to the side grindstone surface 91 for performing thrust grinding in the first embodiment of the present invention is performed as follows. (See Fig. 2 (A))
(1) The table 7 is sent from the standby position in the Z-axis direction, and the outer peripheral surface of the diamond truer 13 intersects with the plane including the side grinding wheel surface 91 of the grinding wheel 9 and is positioned at a position protruding by a predetermined depth of cut. The
[0016]
(2) Then, when the grindstone table 4 is advanced in the X-axis direction, the side grindstone surface 91 comes into contact with the outer peripheral surface of the diamond truer 13 and is truded with a predetermined cut amount from the outer peripheral side to advance the side surface. The position A at a predetermined distance from the outer periphery of the grindstone surface, that is, the position where the predetermined radius position has reached the diamond truer 13 is set as the first stop position, and the advancement of the grindstone table 4, that is, the grinding wheel 9 is stopped at that position. For example, a shallow circumferential groove 15 having a depth of about 2 μm is formed on the side grindstone surface 91 after stopping for 0.1 second.
[0017]
(3) Next, after the temporary stop, the grinding wheel base 4, that is, the grinding wheel 9 is moved forward to the next predetermined position by a predetermined distance in the X-axis direction, as in the previous time, the side grinding wheel surface 91 is truded with a predetermined cutting amount toward the center, and a position B at a second predetermined distance from the outer periphery of the advancing side surface of the grindstone, that is, a position at which the second predetermined radial position reaches the diamond truer 13 is the second. The stop position is set, and the advancement of the grinding wheel base 4, that is, the grinding wheel 9 is stopped at that position.
[0018]
(4) By the temporary stop of the grinding wheel 9 as in the previous time, a shallow circumferential groove 15 similar to the previous circumferential groove 15 is formed as a concentric circle on the side grinding wheel surface 91.
(5) The truing in the radial direction along the side grinding wheel surface 91 and the circumferential groove formation with respect to the side grinding wheel surface 91 as described above are repeated as many times as necessary (three times in the illustrated example). When the radial truing along the inner circumference of the side grinding wheel surface 91 reaches the inner periphery of the side grinding wheel surface 91, the advancement of the grinding wheel base 4 is stopped, and the table 7, that is, the diamond truer 13, moves away from the grinding wheel base 4, that is, the grinding wheel 9. It is sent in the Z-axis direction and returns to the standby position. Then, the grindstone table 4 is also returned in the X-axis direction to the standby position.
[0019]
Truing with respect to the side grindstone surface 91 for performing thrust grinding in the second embodiment of the present invention is performed as follows. (See Fig. 2 (A))
(1) The grindstone base 4 is advanced in the X-axis direction until the inner peripheral surface of the side grindstone surface 91 is in front of the diamond truer 13. Then, the table 7 is sent in the Z-axis direction from the standby position, and the outer peripheral surface of the diamond truer 13 intersects with the plane including the side grinding wheel surface 91 of the grinding wheel 9 and is positioned at a position protruding by a predetermined cutting amount. .
[0020]
(2) Then, when the grindstone table 4 is retracted in the X-axis direction, the side grindstone surface 91 comes into contact with the outer peripheral surface of the diamond truer 13 and is trued with a predetermined depth of cut from the inner peripheral side. A position C at a predetermined distance from the outer periphery of the surface, that is, a position at which a predetermined radial position reaches the diamond truer 13 is set as a first stop position, and the backward movement of the grindstone table 4, that is, the grinding wheel 9 is stopped at that position. For example, a shallow circumferential groove 15 having a depth of about 2 μm is formed on the side grindstone surface 91 after stopping for 0.1 second.
[0021]
(3) Next, after the temporary stop, the grindstone table 4, that is, the grindstone wheel 9 is moved back to the next predetermined position by a predetermined distance in the X-axis direction. Reference numeral 91 denotes a second position at a position B at a second predetermined distance from the outer periphery of the retreating side grindstone surface, that is, a position at which the second predetermined radius position has reached the diamond truer 13. The stop position is set, and the backward movement of the grinding wheel base 4, that is, the grinding wheel 9 is stopped at that position.
[0022]
(4) By the temporary stop of the grinding wheel 9 as in the previous time, a shallow circumferential groove 15 similar to the previous circumferential groove 15 is formed as a concentric circle on the side grinding wheel surface 91.
(5) The truing in the radial direction along the side grinding wheel surface 91 and the circumferential groove formation with respect to the side grinding wheel surface 91 as described above are repeated as many times as necessary (three times in the illustrated example). When the radial truing along the circumference reaches the outer periphery of the side grinding wheel surface 91, the backward movement of the grinding wheel base 4 is stopped, and the table 7, that is, the diamond truer 13, is moved away from the grinding wheel base 4, that is, the grinding wheel 9. It is sent in the axial direction and returns to the standby position. Then, the grindstone table 4 is also returned in the X-axis direction to the standby position.
[0023]
Truing with respect to the side grindstone surface 91 for performing thrust grinding in the third embodiment of the present invention is performed as follows. (See Fig. 2 (B))
(1) The table 7 is sent from the standby position in the Z-axis direction, and the outer peripheral surface of the diamond truer 13 intersects with the plane including the side grinding wheel surface 91 of the grinding wheel 9 and is positioned at a position protruding by a predetermined depth of cut. The
[0024]
(2) Then, when the grindstone table 4 is advanced in the X-axis direction, the side grindstone surface 91 comes into contact with the outer peripheral surface of the diamond truer 13 and is truded with a predetermined cut amount from the outer peripheral side to advance the side surface. The position A at a predetermined distance from the outer periphery of the grindstone surface, that is, the position where the predetermined radius position has reached the diamond truer 13 is set as the first stop position, and the advancement of the grindstone table 4, that is, the grinding wheel 9 is stopped at that position.
[0025]
(3) Next, when the table 7, that is, the diamond truer 13 is further advanced by a predetermined distance in the Z-axis direction toward the grinding wheel 9, the outer peripheral area of the diamond truer 13 has a predetermined amount of the side grinding wheel surface 91 of the grinding wheel 9. A circumferential groove 16 having a depth corresponding to the depth of cut is formed in the side grindstone surface 91. The cross-section of the circumferential groove 16 has a bottom width that substantially corresponds to the thickness d of the diamond truer 13, a vertical line to the side grindstone surface 91 on the inner side, an ellipse on the outer side, and a width on the opening side of the diamond truer 13. It becomes wider than the thickness.
[0026]
(4) Once the table 7, that is, the diamond truer 13 is returned to the original Z-axis direction position, the grindstone table 4 is advanced to the next predetermined position by a predetermined distance in the X-axis direction. Further, the side grinding wheel surface 91 is trued with a predetermined cutting amount toward the center, and a position B at a second predetermined distance from the outer periphery of the side grinding wheel surface moving forward, that is, a second predetermined radius position reaches the diamond truer 13. This position is set as the second stop position, and the advancement of the grindstone table 4, that is, the grinding wheel 9 is stopped at that position.
[0027]
(5) As in the previous case, the outer peripheral area of the diamond truer 13 advances by a predetermined amount in the Z-axis direction, cuts a predetermined amount of the side surface 91 of the grinding wheel 9, and the side surface wheel 91 has the previous circumferential groove. Deep circumferential grooves 16 similar to 16 are formed as concentric circles.
[0028]
(6) The truing in the radial direction along the side grinding wheel surface 91 and the formation of the circumferential groove with respect to the side grinding wheel surface 91 as described above are repeated an appropriate number of times (three times in the illustrated example). When the radial truing along the inner circumference of the side grinding wheel surface 91 reaches the inner periphery of the side grinding wheel surface 91, the advancement of the grinding wheel base 4 is stopped, and the table 7, that is, the diamond truer 13, moves away from the grinding wheel base 4, that is, the grinding wheel 9. It is sent in the Z-axis direction and returns to the standby position. Then, the grindstone table 4 is also returned in the X-axis direction to the standby position.
[0029]
Truing with respect to the side grindstone surface 91 for performing thrust grinding in the fourth embodiment of the present invention is performed as follows. (See Fig. 2 (B))
(1) The table 7 is sent from the standby position in the Z-axis direction, and the outer peripheral surface of the diamond truer 13 intersects with the plane including the side grinding wheel surface 91 of the grinding wheel 9 and is positioned at a position protruding by a predetermined depth of cut. The
[0030]
(2) Then, when the grindstone table 4 is advanced in the X-axis direction, the side grindstone surface 91 comes into contact with the outer circumferential surface of the diamond truer 13 and is trued with a predetermined cutting amount from the outer circumferential side. When the truing in the radial direction along 91 reaches the inner periphery of the side grinding wheel surface 91, the advancement of the grinding wheel base 4 is stopped.
[0031]
(3) Next, the grinding wheel base 4, that is, the grinding wheel 9 is moved back in the X-axis direction, and a position C at a predetermined distance from the outer periphery of the side grinding wheel surface, that is, a position at which a predetermined radial position has reached the diamond tourer 13. To the first stop position.
[0032]
(4) Next, when the table 7, that is, the diamond truer 13 is further advanced by a predetermined distance in the Z-axis direction toward the grinding wheel 9, the outer peripheral area of the diamond truer 13 has a predetermined amount of the side grinding wheel surface 91 of the grinding wheel 9. A circumferential groove 16 having a cross section similar to that of the third embodiment is formed in the side grindstone surface 91 at a depth corresponding to the depth of cut and the depth of cut.
[0033]
(5) After the table 7, that is, the diamond truer 13 is returned to the original position in the Z-axis direction, the grindstone table 4 is retracted to the next predetermined position by a predetermined distance in the X-axis direction. The position B at the second predetermined distance from the outer periphery of the surface, that is, the position at which the second predetermined radius position has reached the diamond truer 13 is set as the second stop position, and the grindstone table 4, that is, the grinding wheel 9 is stopped at that position. Is done.
[0034]
(6) And, as in the previous time, the outer peripheral area of the diamond truer 13 advances by a predetermined amount in the Z-axis direction, cuts a predetermined amount of the side grindstone surface 91 of the grinding wheel 9, and the side surface grindstone surface 91 includes the previous circumferential groove. A circumferential groove 16 similar to 16 is formed as a concentric circle.
[0035]
(7) The table in the last circumferential groove formation is repeated by repeating the recession of the predetermined distance in the X-axis direction of the grindstone table 4 and the formation of the circumferential groove as appropriate (three times in the illustrated example). 7, that is, when the diamond truer 13 returns, the table 7, that is, the diamond truer 13, moves away from the grinding wheel base 4, that is, the grinding wheel 9, and returns to the standby position. Then, the grindstone table 4 is also returned in the X-axis direction to the standby position.
[0036]
Truing with respect to the side grindstone surface 91 for performing thrust grinding in the fifth embodiment of the present invention is performed as follows. (See figure (C))
(1) The table 7 is sent in the Z-axis direction from the standby position, and the outer peripheral surface of the diamond truer 13 intersects with the flat surface including the side grinding wheel surface 91 of the grinding wheel 9 at the outer periphery of the grinding wheel 9, and a predetermined cutting amount is obtained. It is positioned at the protruding position.
[0037]
(2) When the wheel head 4 is advanced in the X axis direction, side grinding wheel surface 91, in contact with the outer peripheral surface of the diamond truer 13, plane side grinding surface 91 from the outer peripheral side at a predetermined depth of cut When the truing to be changed is applied and the truing in the radial direction along the side grinding wheel surface 91 reaches the inner periphery of the side grinding wheel surface 91, the advancement of the grinding wheel base 4 is stopped.
[0038]
(3) Next, the grinding wheel base 4, that is, the grinding wheel 9 is moved back in the X-axis direction, and a position C at a predetermined distance from the outer periphery of the side grinding wheel surface, that is, a position at which a predetermined radial position has reached the diamond tourer 13. To the first stop position.
[0039]
(4) Next, when the table 7, that is, the diamond truer 13 is further advanced by a predetermined minute distance in the Z axis direction toward the grinding wheel 9, the outer periphery of the diamond truer 13 is at the position C (first stop position). A predetermined minute amount of the side grindstone surface 91 of the vehicle 9 is cut. At the same time, at the speed required for one revolution of the grinding wheel 9 to travel at least a distance larger than the thickness of the diamond truer 13 (speed V> the thickness d of the diamond truer 13 / time t of one revolution of the grinding wheel ) , The platform 4, that is, the grinding wheel 9, is retracted in the X-axis direction until a position A, that is, a predetermined radial position, reaches a diamond truer 13 at a predetermined distance from the outer periphery of the side grinding wheel surface.
As a result, the spiral groove 17 having a minute depth of cut is formed on the side grindstone surface 91.
[0040]
(5) The grinding wheel base 4, that is, the grinding wheel 9 stops when the position A at a predetermined distance from the outer periphery of the side grinding wheel surface, that is, the predetermined radial position reaches the diamond truer 13. The table 7, that is, the diamond truer 13 is moved away from the grinding wheel base 4, that is, the grinding wheel 9 to the standby position in the Z-axis direction, and the grinding wheel base 4 is also returned to the standby position in the X-axis direction.
[0041]
Truing with respect to the side grindstone surface 91 for performing thrust grinding in the sixth embodiment of the present invention is performed as follows. (See figure (C))
(1) The grindstone base 4 is advanced in the X-axis direction until the inner peripheral surface of the side grindstone surface 91 is in front of the diamond truer 13. Then, the table 7 is sent in the Z-axis direction from the standby position, and the outer peripheral surface of the diamond truer 13 intersects with the plane including the side grinding wheel surface 91 of the grinding wheel 9 and is positioned at a position protruding by a predetermined cutting amount. .
[0042]
(2) Then, when the grindstone table 4 is moved backward in the X-axis direction, the side grindstone surface 91 comes into contact with the inner circumferential surface of the diamond truer 13 and is trued by a predetermined cutting amount from the inner circumferential side. When the truing in the radial direction along the grinding wheel surface 91 reaches the outer periphery of the side grinding wheel surface 91, the backward movement of the grinding wheel base 4 is stopped.
[0043]
(3) Next, the grinding wheel base 4, that is, the grinding wheel 9 is advanced as it is in the X-axis direction, and a position A at a predetermined distance from the outer periphery of the side grinding wheel surface, that is, a position at which a predetermined radial position has reached the diamond truer 13. To the first stop position.
[0044]
(4) Next, when the table 7, that is, the diamond truer 13 is further advanced by a predetermined minute distance in the Z-axis direction toward the grinding wheel 9, the outer peripheral area of the diamond truer 13 predetermines the side grinding wheel surface 91 of the grinding wheel 9. A small amount is cut. At the same time, during one rotation of the grinding wheel 9, the grinding wheel base 4, that is, the grinding wheel 9, is moved at a speed that is at least a distance larger than the thickness of the diamond truer 13, and the position C of a predetermined distance from the outer periphery of the side grinding wheel surface, that is, It is advanced in the X-axis direction until a predetermined radial position reaches the diamond truer 13.
As a result, the spiral groove 17 having a minute depth of cut is formed on the side grindstone surface 91.
[0045]
(5) The grinding wheel base 4, that is, the grinding wheel 9, when the position of a predetermined distance from the outer periphery of the side grinding wheel surface, that is, the predetermined radial position reaches the diamond truer 13, the grinding wheel base 4, that is, the grinding wheel 9 stops, The table 7, that is, the diamond truer 13 is moved away from the grinding wheel base 4, that is, the grinding wheel 9 to the standby position in the Z-axis direction, and the grinding wheel base 4 is also returned to the standby position in the X-axis direction.
[0046]
In each of the above embodiments, the left side grindstone surface 91 is illustrated in FIGS. 2 and 3, but it can be easily understood that the right side grindstone surface 91 is similarly trued.
[0047]
And if the grinding wheel wears due to end face grinding and the side surface of the grinding wheel, that is, the groove formed on the side grinding wheel surface becomes shallow and its performance decreases to a predetermined value or less, again against the side grinding wheel surface And re-groove forming truing.
That is, groove forming truing is performed so that the depth of the groove is larger than the wear amount of the grindstone by end face grinding between the immediately following groove forming truing and the next reclaimed groove forming truing.
[0048]
In addition, the position of the outermost groove so that the dimension from the outer peripheral surface to the outermost groove is larger than the wear amount of the grinding wheel by grinding using the outer peripheral wheel surface of the grinding wheel other than the end face grinding in the meantime. That is, position A is determined.
And in the reproduction groove forming truing, the truing of the flat surface with respect to the side grindstone surface of the grinding wheel is set to a cutting amount so that the remaining groove is removed and the side grindstone surface becomes flat.
[0049]
In the third embodiment and the fourth embodiment (FIG. 2B), by forming a groove deeper than the life of the side grindstone during the first truing, the truing for the second and subsequent times. Since the groove formed first remains, the groove forming step is unnecessary, and it is only necessary to uniformly truing the side surface of the grindstone as in the conventional case.
[0050]
As described above, end grinding is performed on the workpiece with the grinding wheel having the side grinding wheel surface trued by the truing method of each embodiment. That is, the control device 14 controls the rotation of the servo motor 2, the servo motor 5, the spindle drive motor, and the grindstone drive motor 8.
[0051]
For example, in the grinding process for the workpiece W composed of the flange portion and the shaft portion as shown in FIG. 1, the table 7 at the illustrated standby position, that is, the grindstone table at the illustrated standby position with respect to the rotating workpiece W is illustrated. 4, that is, the rotating grinding wheel 9 advances in the X-axis direction, the outer circumferential grinding wheel surface of the grinding wheel 9 makes a predetermined amount of cut with respect to the shaft portion of the workpiece W, and the grinding wheel base 4 stops.
[0052]
Then, the table 7 is sent in the Z axis direction, rightward in the figure. As a result, the shaft portion of the workpiece W is traverse-ground by the outer peripheral grinding wheel surface of the grinding wheel 9, and the flange portion of the workpiece W, that is, the grinding surface, is the side grinding wheel surface 91 that is trued as described above of the grinding wheel 9. To approach. Eventually, the flange portion of the workpiece W, that is, the grinding surface comes into contact with the side grinding wheel surface 91 and is cut by a predetermined amount. As a result, the end surface of the workpiece W is thrust ground by the side grinding wheel surface 91 of the grinding wheel 9. .
[0053]
At that time, the grinding fluid supplied to the grinding point easily flows into the groove from the opening of the shallow circumferential groove 15..., The deep circumferential groove 16. Since it is held and flows out, the grinding surface is sufficiently cooled and the grinding waste is discharged, and the intersection between the side surface of the grindstone surface 91 and the side surface of each groove becomes a cutting edge, contributing to reduction of grinding resistance. As a result, grinding burn is prevented.
[0054]
Further, in the above-described embodiment, the side surface grindstone surface may be trued by a plurality of traverses using a truer before the groove forming process in the above-described embodiment may be performed using the truer.
If the outer peripheral grinding wheel surface of the grinding wheel wears due to grinding, the outermost peripheral groove cannot be formed, so after detecting the outer grinding wheel surface of the grinding wheel by contact detection etc., this outer peripheral grinding wheel surface is used as a reference The grooves may be formed at a predetermined interval (for example, 1 to 2 times the truer width). Then, the number of grooves is obtained by calculation from the grindstone width, the truer width, and the groove interval.
[0055]
Further, the present invention assumes end face thrust grinding, but a grinding method in which the grinding wheel is advanced parallel to the flange portion of the workpiece (X axis) and the flange portion is plunge ground from the outer peripheral side. May also be applied.
Since the cooling efficiency by the coolant is increased, grinding burn can be prevented and the grinding efficiency can be improved. In particular, it is more effective when the radius of the flange portion is long.
[0056]
【The invention's effect】
In the case of performing end surface grinding with a grinding wheel trued by the truing method of the grinding wheel for end surface grinding according to the present invention, a groove is formed on the side grinding wheel surface of the grinding wheel, and the grinding wheel surface and the end surface of the workpiece, that is, the grinding surface, Without being concentric, the grinding surface of the workpiece is within the range of the side grinding wheel surface, so that the grinding fluid supplied to the grinding point easily flows into the groove from the groove opening and is held in the groove. Since it flows out, the cooling of the grinding surface and the discharge of grinding debris are sufficient, and the intersection line between the side grindstone surface and the side surface of each groove becomes a cutting edge, which contributes to reducing grinding resistance. As a result, grinding burn is prevented.
Also, any groove can be formed according to the grinding conditions.
[Brief description of the drawings]
FIG. 1 is a plan view of a cylindrical grinding machine provided with a truing device for performing a truing method of a grinding wheel for end face grinding according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a truing method for a grinding wheel for end face grinding according to an embodiment of the present invention.
[Explanation of symbols]
1 Bed 2, 5 Servo motors 3, 6 Guide 4 Grinding wheel base 7 Table 8 Grinding wheel drive motor 9 Grinding wheel 91 Side grinding wheel surface 10 Work spindle stock 11 Tailstock 12 Truing device 12a Main body 13 Diamond truer 14 Control device 15 Shallow circumference Groove 16 Deep circumferential groove 17 Spiral groove W Workpiece

Claims

For end face grinding that forms a groove that draws a rotation trajectory around the axis of the side grinding wheel surface by temporarily stopping the relative displacement during flat truing due to the relative displacement in the radial direction of the side grinding wheel surface of the rotating grinding wheel The truing method of a grinding wheel.

In the relative displacement temporary stop during flat truing due to the relative displacement in the radial direction between the side grinding wheel surface of the rotating grinding wheel and the contacting luer, the turning trajectory of the side grinding wheel surface causes the rotation trajectory around the axis to the side grinding wheel surface. A truing method for a grinding wheel for end face grinding to form a groove to be drawn.

The truing method of the grinding wheel for end face grinding according to claim 1 or 2 , wherein the rotation locus around the axis is an appropriate number of concentric circles.

After flat truing due to the relative displacement in the radial direction between the side grinding wheel surface of the rotating grinding wheel and the truer that is in contact with the side grinding wheel surface, the side surface of the grinding wheel surface is cut by turning the side surface of the grinding wheel on the side surface of the grinding wheel in the rotational path around the axis. A truing method for a grinding wheel for end face grinding, in which a groove that forms a rotation trajectory around an axis is formed and the depth of the groove is larger than the side wheel grinding amount of the grinding wheel until the next groove forming truing.

The truing method for a grinding wheel for end face grinding according to claim 4, wherein the rotation locus around the axis is a spiral.

4. The truing method for a grinding wheel for end face grinding according to claim 1 , wherein the depth of the groove formed by grooving truing is set to be larger than the side wheel wear amount of the grinding wheel until the next grooving truing.

After flat truing due to the relative displacement in the radial direction between the side grinding wheel surface of the rotating grinding wheel and the truer that contacts the grinding wheel surface, the side grinding wheel surface is cut into the side grinding wheel surface by cutting the side grinding wheel surface along the axis of rotation. Grooves that form a rotation trajectory around the axis, and the amount of wear on the outer wheel surface of the grinding wheel between the groove adjacent to the outer wheel surface of the wheel and the outer wheel surface until the next groove forming truing is performed. A truing method for grinding wheels for end grinding that is larger.

The truing method of the grinding wheel for end face grinding according to claim 7, wherein the rotation locus around the axis is a spiral.

7. The grinding wheel surface wear amount of the grinding wheel between the groove adjacent to the grinding wheel surface of the grinding wheel and the grinding wheel surface in the radial direction is set to be larger than the grinding wheel surface grinding amount until the next groove forming truing. Truing method of grinding wheel for end face grinding. "