JP3825010B2

JP3825010B2 - Electrolytic sharpening device for grinding wheels

Info

Publication number: JP3825010B2
Application number: JP2003092388A
Authority: JP
Inventors: 浩仁横田; 祥雄土方; 聖又石本
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2003-03-28
Filing date: 2003-03-28
Publication date: 2006-09-20
Anticipated expiration: 2021-09-20
Also published as: JP2003300157A

Description

【０００１】
【産業上の利用分野】
この発明は例えば研削加工に用いられる砥石を電解作用によって目立てる装置であって、特に砥石とほぼ同径の内面研削時に併用可能な砥石の電解目立て装置に関するものである。
【０００２】
【従来の技術】
図７は特開平４−１１５８６７号公報に示された内面研削時に併用した砥石の電解目立て装置を示す構成図である。この図７において、ターニングセンタ加工機の回転チャック１には被削材２が取り付けられ、軸付きメタルボンド砥石と呼ばれる砥石体３が被削材２に軸方向で対向し往復駆動可能に設置される。この砥石体３は軸部としての砥石台金４の外周全面に砥粒を導電性の結合剤で結合してなる砥石層５を固定して構成される。この砥石体３の砥石台金４には図外の電解電源の陽極端子に電線で接続されて陽極を構成する給電電極６を摺接可能に接触させる。陰極を構成する給電電極７は研削機械の固定部に設置された支持部材８に絶縁体９を介して支持され、この給電電極７は砥石層５の外周の約１／３を砥石層５の外周に沿い所定の隙間をもって覆う大きさになっている。この給電電極７の砥石層５と対向する弧状の電極面には図外の研削液出口を備え、この研削液出口に連通する研削液供給パイプ１０が給電電極７の側面に延設され、この研削液供給パイプ１０から供給された導電性の研削液が研削液出口から砥石層５と給電電極７との隙間に供給される。また供電電極７の側面には図外の電解電源の陰極端子に電線で接続された端子１１を備える。
【０００３】
次に上記従来の砥石の電解目立て装置の動作を図８を用い説明する。図８のａ図では、陰極の給電電極７が回転チャック１に取り付けられた被削材２の円筒部の端面から軸方向に距離を隔てて配置される。そして、研削加工前に陽極の給電電極６を接触した砥石体３の砥石層５が給電電極７の位置で停止され、研削液供給パイプ１０から導電性の研削液１２が給電電極７とこれに対向する砥石層５との隙間に供給され、給電電極６，７間に砥石体３および研削液１２を介して通電することによって砥石層５表面の結合剤を電解して除去し、砥石層５表面の初期目立てを行う。図８のｂ図では給電電極６への通電を停止し、研削液１２を供給しながら、被削材２の円筒部の内部に砥石体３による一定切り込みを与え、円筒部の底面までトラバース研削を行う。そして、砥石体３を図８のｃ図に示すように初期位置まで戻す。図８のｃ図では研削液１２を供給したまま、給電電極６，７間に砥石体３および研削液１２を介して再び通電して砥石層５表面の結合剤を電解して除去し、砥石層５表面の目立てを行う。その後は、図８のｂ図とｃ図との工程を一定時間ごとに反復する。
【０００４】
【発明が解決しようとする課題】
前記した従来の砥石の電解目立て装置は上記のように砥石体３を被削材２と陰極を構成する給電電極７との間で反復駆動させながら、電解目立てと研削加工とを交互に行う構成であるので、砥石体とほぼ同径の内面研削が可能であるものの、非研削加工時間である電解目立て時間が必要なため、研削加工の効率が悪いという問題があった。
【０００５】
この発明は上記のような課題を解決するためになされたもので、その目的は研削加工と電解目立てとの同時進行を可能にし、砥石体の切れ味を良好に保ちながら研削加工を継続できる砥石の電解目立て装置を得ることである。
【０００６】
【課題を解決するための手段】
請求項１に記載した第１の発明に係る砥石の電解目立て装置は、通電のための陽極を構成する給電電極が砥石台金に摺接可能に接触される一方、砥石層の外周面には複数の溝が周方向に離間配置して形成され、この複数の溝に複数の電極体が絶縁層を介在させて周方向に離間配置して固定され、通電のための陰極を構成する給電電極が砥石層における複数の溝間に位置する突出部の不在な部分であるとともに複数の電極体と絶縁体とが周方向に交互に連接する部分に摺接可能に接触されたものである。
【０００７】
請求項２に記載した第２の発明に係る砥石の電解目立て装置は、第１の発明に記載された砥石層の突出部の外周面と複数の電極体の外周面と絶縁体の外周面とがほぼ面一に形成されたものである。
【０００８】
請求項３に記載した第３の発明に係る砥石の電解目立て装置は、通電のための陽極を構成する給電電極が砥石台金に摺接可能に接触され、陽極を構成する給電電極と砥石層との間に位置する砥石台金の外周面には絶縁層を介して導電性リングが陽極を構成する給電電極および砥石層から分離された形態で固定され、導電性リングには陰極を構成する給電電極が摺接可能に接触される一方、砥石層の外周面には複数の溝が周方向に離間配置して形成され、これらの溝に複数の電極体が絶縁層を介在させて周方向に離間配置して固定され、これらの電極体と上記導電性リングとが互いに接続されたものである。
【０００９】
請求項４に記載した第４の発明に係る砥石の電解目立て装置は、第３の発明に記載された複数の電極体がカーボンや快削黄銅または導電性樹脂で形成されたものである。
【００１０】
請求項５に記載した第５の発明に係る砥石の電解目立て装置は、第３の発明に記載された砥石台金と導電性リングとの間における絶縁層には導電性リングと砥石層における複数の溝間に位置する突出部とを絶縁する鍔が設けられ、これらの鍔と砥石層の外周面に固定された複数の電極体と導電性リングとが導電性の接着剤で互いに接着されたものである。
【００１１】
【作用】
第１の発明の砥石の電解目立て装置は、通電のための陽極を構成する給電電極が砥石台金に摺接可能に接触される一方、砥石層の外周面には複数の溝が周方向に離間配置して形成され、この複数の溝に複数の電極体が絶縁層を介在させて周方向に離間配置して固定され、通電のための陰極を構成する給電電極が砥石層における複数の溝間に位置する突出部の不在な部分であるとともに複数の電極体と絶縁体とが周方向に交互に連接する部分に摺接可能に接触されたことによって、砥石層が砥石台金を介する給電電極からの給電により陽極として働き、複数の電極体が給電電極に間欠的に接触して陰極として働き、両給電電極間に砥石台金と砥石層および研削液を通じて電気が流れ、砥石層の突出部の表面の結合剤が電解によって溶けて砥石層の突出部の表面から除去され、砥石層の突出部の表面に砥粒が露出し、砥石層の突出部の表面が研削に適合する粗さに目立てされる。
【００１２】
第２の発明の砥石の電解目立て装置は、砥石層の突出部の外周面と複数の電極体の外周面と絶縁体の外周面とがほぼ面一に形成されたことによって、陰極を構成する給電電極が好適に摺接できる。
【００１３】
第３の発明の砥石の電解目立て装置は、通電のための陽極を構成する給電電極が砥石台金に摺接可能に接触され、陽極を構成する給電電極と砥石層との間に位置する砥石台金の外周面には絶縁層を介して導電性リングが陽極を構成する給電電極および砥石層から分離された形態で固定され、導電性リングには陰極を構成する給電電極が摺接可能に接触される一方、砥石層の外周面には複数の溝が周方向に離間配置して形成され、これらの溝に複数の電極体が絶縁層を介在させて周方向に離間配置して固定され、これらの電極体と上記導電性リングとが互いに接続されたことによって、全部の電極体に同時に給電することから、砥石層の全箇所で電解目立てが行える。
【００１４】
第４の発明の砥石の電解目立て装置は、複数の電極体がカーボンや快削黄銅または導電性樹脂で形成されたことによって、電極体が研削加工による砥石層の摩耗による後退量と同じ分だけ摩耗後退し、砥石層と複数の電極体との距離が常に一定となり、安定した電解目立てが行える。
【００１５】
第５の発明の砥石の電解目立て装置は、砥石台金と導電性リングとの間における絶縁層には導電性リングと砥石層における複数の溝間に位置する突出部とを絶縁する鍔が設けられ、これらの鍔と砥石層の外周面に固定された複数の電極体と導電性リングとが導電性の接着剤で互いに接着されたことによって、リード線を使用しない簡素化された構造となる。
【００１６】
【実施例】
以下、この発明の各実施例を図１乃至図６を用い前記従来例と同一部分に同一符号を付して説明する。
【００１７】
実施例１．
図１のａ図はこの発明の実施例１としての砥石の電解目立て装置を示す斜視図、図１のｂ図は同ａ図に示す砥石体の底面図、図２はこの実施例１の砥石体の製造過程の一例を示す図、図３はこの実施例１の砥石体の製造過程の異なる例を示す図である。
【００１８】
図１のａ図およびｂ図において、砥石台金２０の一端部の外周面には図外の電解電源の陽極端子に電線で接続されて陽極を構成する給電電極６が摺接可能に接触され、砥石体３は砥石台金２０の他端部の外周全面には砥粒を導電性の結合剤で結合してなる砥石層２３が密接して固定され、この砥石層２３の外周面には複数の溝２７が周方向に離間配置して形成され、この複数の溝２７に複数の電極体２８がエポキシ系などのような絶縁性樹脂製の絶縁層２２を介在させて周方向に離間配置して固定され、砥石層２３の溝２７間に位置する突出部２３ａより砥石層２３の一端部側に突出する電極体２８の外周面と同電極体２８間に介在された絶縁層２２の外周面とには電解電源の陰極端子に電線で接続されて陰極を構成する給電電極２１が摺接可能に接触される。
【００１９】
上記砥石体３は例えば図２または図３に示すような過程で製造される。図２の場合は砥石台金２０の他端部の外周面に設けた砥石層２３の一端部を研削して段差部２９を形成するとともに、砥石層２３の外周面に複数の溝２７を周方向に等分配置して軸方向に直線状に形成する一方、この複数の溝２７より軸方向長さの長い複数の電極体２８を形成し、この複数の電極体２８を上記砥石層２３の溝２７にエポキシ系の絶縁性接着剤で接着して、電極体２８の他端部を砥石層２３の他端部に整合するとともに、電極体２８の一端部を砥石層２３の一端部より軸方向に突出させた後、この電極体２８の砥石層２３より突出する一端部と砥石台金２０との間および砥石層２３の一端部間それぞれに上記と同一の絶縁性接着剤または絶縁性樹脂をモールド成形にて埋め込む。上記絶縁性接着剤とモールド成形された絶縁性接着剤または絶縁樹脂とによって絶縁層２２が構成される。結果として、図１に示す砥石体３が構成され、砥石層２３と複数の電極体２８と絶縁層２２とが砥石台金２０の他端部の外周面に固定される単一体を構成し、この単一体の外周面を構成する砥石層２３の溝２７間に位置する突出部２３ａの外周面と複数の電極体２８の外周面と絶縁層２２の外周面とがほぼ面一となっている。この外周面の面一構成については、組立て機械上でツルーイングを行うことで、砥石層２３の溝２７間に位置する突出部２３ａの外周面と複数の電極体２８の外周面と絶縁層２２の外周面との段差を１μｍ以下に調整することは可能であるので、給電電極２１が好適に摺接できる。
【００２０】
また図３の場合は、円筒状に形成された砥石層２３の外周面に複数の溝２７を周方向に等分配置して軸方向に直線状に形成する一方、この複数の溝２７より軸方向長さの長い複数の電極体２８を形成し、この複数の電極体２８を上記砥石層２３の溝２７にエポキシ系の絶縁性接着剤で接着して電極体２８の他端部を砥石層２３の他端部に整合するとともに電極体２８の一端部を砥石層２３の一端部より軸方向に突出させ、その砥石層２３の中央に形成された貫通孔２３ｂに砥石台金２０を圧入して砥石台金２０の一端部を砥石層２３の一端部より突出させた後、この電極体２８の砥石層２３より突出する一端部と砥石台金２０との間および砥石層２３の一端部間それぞれに上記と同一の絶縁性接着剤もしくは絶縁性樹脂をモールド成形にて埋め込み、このモールド成形された絶縁性接着剤と上記絶縁性接着剤とによって絶縁層２２を構成し、結果として、図１に示す砥石体３を構成する。
【００２１】
この実施例１によれば、砥石体３が図１のａ図に示す矢印方向に回転し、砥石層２３が砥石台金２０を介する給電電極６からの給電により陽極として働き、複数の電極体２８が給電電極２１に間欠的に接触して陰極として働き、両給電電極６，２１間に砥石台金２０と砥石層２３および研削液１２を通じて電気が流れ、砥石層２３の突出部２３ａの表面の結合剤が電解によって溶けて砥石層２３の突出部２３ａの表面から除去され、砥石層２３の突出部２３ａの表面に砥粒が露出し、砥石層２３の突出部２３ａの表面が研削に適合する粗さに目立てされる。
【００２２】
要するに、この実施例１では複数の電極体２８を砥石層２３の外周面に周方向に離間配置して固定したので、被削材２と接触していない電極体２８にだけ給電できる。結果として、金属材にて構成された回転チャックでも導電性の被削材を漏電することなく研削しながら砥石層２３の目立てを行うことができるので、在来の金属材にて構成された回転チャックを使用することができる。また、複数の電極体２８に用いる材質の特徴としては、ツルーイング時の成形性がよいこと、加工時に塑性変形を起こすがそれが砥石層２３側に及ばないこと、そして導電性が有ることであり、つまり、電極体２８としては脆性材料で導電性を示すものがよく、例えば電極体２８をカーボンや快削黄銅または導電性樹脂などで構成することによって、研削加工による砥石層２３の摩耗による後退量と同じ分だけ電極体２８が摩耗後退するので、砥石層２３と複数の電極体２８との距離が常に一定となり、安定した電解目立てが行える。
【００２３】
実施例２．
図４はこの発明の実施例２としての砥石の電解目立て装置を示す斜視図である。この図４において、砥石台金２０の一端部の外周面には陽極を構成する給電電極６が摺接可能に接触され、砥石体３は砥石台金２０の他端部の外周全面には砥石層２３が密接に固定され、この砥石層２３の外周面には複数の溝２７が周方向に等分配置して軸方向に直線状に形成され、この複数の溝２７それぞれには複数の電極体２８がエポキシ系などのような絶縁性樹脂製の絶縁層２２を介在させて個別に固定され、砥石台金２０の砥石層２３と給電電極６との間に位置する部分の外周面にはリング絶縁層３０が密接して固定され、このリング絶縁層３０の外周面には導電性リング３１が密接して固定されている。この導電性リング３１の外周面には陰極に構成される給電電極２１が摺接可能に接触され、導電性リング３１には複数の電極体２８がリード線３２で接続されている。
【００２４】
この実施例２によれば、電極体２８をカーボンや快削黄銅または導電性樹脂などで構成することによって、電極体２８が研削加工による砥石層２３の摩耗による後退量と同じ分だけ摩耗後退するので、砥石層２３と複数の電極体２８との距離が常に一定となり、安定した電解目立てが行える。また、全部の電極体２８に同時に給電することから、砥石層２３の全箇所で電解目立てが行える。結果として、良好で安定した切れ味を保ちながら研削加工を継続することが可能となる。
【００２５】
実施例３．
図５はこの発明の実施例３としての砥石の電解目立て装置を示す斜視図、図６はこの実施例３の砥石体の製造過程の一例を示す図である。
図５において、砥石台金２０の一端部の外周面には陽極を構成する給電電極６が摺接可能に接触され、砥石台金２０の他端部の外周全面には砥石層２３が密接して固定され、この砥石層２３の外周面には複数の溝２７が周方向に等分配置して軸方向に直線状に形成され、この複数の溝２７それぞれには複数の電極体２８がエポキシ系などのような絶縁性樹脂製の絶縁層２２を介在させて個別に固定され、砥石台金２０の砥石層２３と給電電極６との間に位置する部分の外周面には導電性リング３１がリング絶縁層３０を介して密接に固定され、導電性リング３１の下端面には複数の電極体２８の一端面が導電性の接着剤３３で接続され、この導電性リング３１の外周面には陰極に構成される給電電極２１が摺接可能に接触されている。
【００２６】
この実施例３の砥石体３は例えば図６に示すような過程で製造される。この図６において、円筒状に形成れた砥石層２３の外周面に複数の溝２７を周方向に等分配置して軸方向に直線状に形成する一方、この複数の溝２７より軸方向長さの長い複数の電極体２８を形成し、この複数の電極体２８を上記砥石層２３の溝２７にエポキシ系の絶縁性接着剤で接着して電極体２８の他端部を砥石層２３の他端部に整合するとともに電極体２８の一端部を砥石層２３の一端部より軸方向に突出させる。またリング絶縁層３０が筒体３０ａの他端に鍔３０ｂを有し、この鍔３０ｂの外周面に複数の溝３０ｃを有し、このリング絶縁層３０を砥石台金２０の中間部に接着剤を介在させつつ外嵌装着し、このリング絶縁層３０の筒体３０ａに導電性リング３１を接着剤３３を介在させつつ外嵌装着し、この導電性リング３１の下端面をリング絶縁層３０の鍔３０ｂの上面に導電性の接着剤３３で接着し、この砥石台金２０の他端部を上記複数の電極体２８を有する砥石層２３の中央に形成された貫通孔２３ｂに圧入し、リング絶縁層３０の溝３０ｃに砥石層２３より突出する電極体２８を挿入し、この電極体２８の一端面を導電性リング３１の下端面に導電性の接着剤３３で接着して、図５に示す砥石体３を構成する。
【００２７】
この実施例３によれば、実施例２に比べリード線を使用しない簡素化された構造となる。
【００２８】
なお、上記実施例１乃至３では軸付きタイプの砥石体３を図示して説明したが、この発明では一般研削工具の砥石の種類上の平形砥石またはカップ形や薄刃砥石などでも利用できることは勿論である。
【００２９】
【発明の効果】
第１の発明によれば、通電のための陽極を構成する給電電極が砥石台金に摺接可能に接触される一方、砥石層の外周面には複数の溝が周方向に離間配置して形成され、この複数の溝に複数の電極体が絶縁層を介在させて周方向に離間配置して固定され、通電のための陰極を構成する給電電極が砥石層における複数の溝間に位置する突出部の不在な部分であるとともに複数の電極体と絶縁体とが周方向に交互に連接する部分に摺接可能に接触されたので、砥石層が砥石台金を介する給電電極からの給電により陽極として働き、複数の電極体が給電電極に間欠的に接触して陰極として働き、両給電電極間に砥石台金と砥石層および研削液を通じて電気が流れ、砥石層の突出部の表面の結合剤が電解によって溶けて砥石層の突出部の表面から除去され、砥石層の突出部の表面に砥粒が露出し、砥石層の突出部の表面が研削に適合する粗さに目立てできるという効果がある。
【００３０】
第２の発明によれば、砥石層の突出部の外周面と複数の電極体の外周面と絶縁体の外周面とがほぼ面一に形成されたので、陰極を構成する給電電極が好適に摺接できるという効果がある。
【００３１】
第３の発明によれば、通電のための陽極を構成する給電電極が砥石台金に摺接可能に接触され、陽極を構成する給電電極と砥石層との間に位置する砥石台金の外周面には絶縁層を介して導電性リングが陽極を構成する給電電極および砥石層から分離された形態で固定され、導電性リングには陰極を構成する給電電極が摺接可能に接触される一方、砥石層の外周面には複数の溝が周方向に離間配置して形成され、これらの溝に複数の電極体が絶縁層を介在させて周方向に離間配置して固定され、これらの電極体と上記導電性リングとが互いに接続されたので、全部の電極体に同時に給電され、砥石層の全箇所で電解目立てが行えるという効果がある。
【００３２】
第４の発明によれば、複数の電極体がカーボンや快削黄銅または導電性樹脂で形成されたので、電極体が研削加工による砥石層の摩耗による後退量と同じ分だけ摩耗後退し、砥石層と複数の電極体との距離が常に一定となり、安定した電解目立てが行えるという効果がある。
【００３３】
第５の発明によれば、砥石台金と導電性リングとの間における絶縁層には導電性リングと砥石層における複数の溝間に位置する突出部とを絶縁する鍔が設けられ、これらの鍔と砥石層の外周面に固定された複数の電極体と導電性リングとが導電性の接着剤で互いに接着されたので、リード線を使用しない簡素化された構造となるという効果がある。
【図面の簡単な説明】
【図１】実施例１の砥石の電解目立て装置を示す図であって、ａ図は斜視図、ｂ図は底面図である。
【図２】実施例１の砥石体の製造過程の一例を示す図である。
【図３】実施例１の砥石体の製造過程の異なる例を示す図である。
【図４】実施例２の砥石の電解目立て装置を示す斜視図である。
【図５】実施例３の砥石の電解目立て装置を示す斜視図である。
【図６】実施例３の砥石体の製造過程の一例を示す図である。
【図７】従来の砥石の電解目立て装置を示す斜視図である。
【図８】同従来の砥石の電解目立て装置の動作説明図である。
【符号の説明】
２被削材
３砥石体
６給電電極
１２研削液
２０砥石台金
２１給電電極
２２絶縁層
２３砥石層
２３ａ砥石層の突出部
２７溝
２８電極体
３０リング絶縁層
３０ｂ鍔
３１導電性リング
３３導電性の接着剤[0001]
[Industrial application fields]
The present invention relates to an apparatus for sharpening a grindstone used for grinding, for example, by electrolytic action, and more particularly to an electrolytic sharpening apparatus for a grindstone that can be used together when grinding an inner surface having substantially the same diameter as the grindstone.
[0002]
[Prior art]
FIG. 7 is a block diagram showing an electrolytic sharpening device for a grindstone used together with the internal grinding shown in JP-A-4-115867. In FIG. 7, a work material 2 is attached to a rotary chuck 1 of a turning center processing machine, and a grindstone body 3 called a metal bond grindstone with a shaft is opposed to the work material 2 in the axial direction and is reciprocally driven. The The grindstone body 3 is configured by fixing a grindstone layer 5 formed by bonding abrasive grains with a conductive binder on the entire outer periphery of a grindstone base 4 as a shaft portion. A power supply electrode 6 that is connected to an anode terminal of an electrolytic power source (not shown) by an electric wire and constitutes an anode is brought into contact with the grinding wheel base 4 of the grinding wheel body 3 so as to be slidable. The feed electrode 7 constituting the cathode is supported by a support member 8 installed in a fixed portion of the grinding machine via an insulator 9, and this feed electrode 7 covers about 1/3 of the outer periphery of the grindstone layer 5 with respect to the grindstone layer 5. It is a size that covers the outer periphery with a predetermined gap. The arc-shaped electrode surface of the power supply electrode 7 facing the grindstone layer 5 is provided with a grinding liquid outlet (not shown), and a grinding liquid supply pipe 10 communicating with the grinding liquid outlet is extended to the side surface of the power supply electrode 7. The conductive grinding liquid supplied from the grinding liquid supply pipe 10 is supplied to the gap between the grindstone layer 5 and the power supply electrode 7 from the grinding liquid outlet. Further, the side surface of the power supply electrode 7 is provided with a terminal 11 connected to a cathode terminal of an electrolytic power source (not shown) by an electric wire.
[0003]
Next, the operation of the above-described conventional grinding stone electroplating apparatus will be described with reference to FIG. In FIG. 8 a, the cathode feeding electrode 7 is arranged at a distance in the axial direction from the end surface of the cylindrical portion of the work material 2 attached to the rotary chuck 1. Then, the grinding wheel layer 5 of the grindstone body 3 that contacts the anode power supply electrode 6 before grinding is stopped at the position of the power supply electrode 7, and the conductive grinding liquid 12 is fed to the power supply electrode 7 and this from the grinding liquid supply pipe 10. The grinding wheel layer 5 is supplied to a gap between the opposing grinding wheel layer 5 and energized between the feeding electrodes 6 and 7 via the grinding wheel body 3 and the grinding fluid 12 to electrolyze the binder on the surface of the grinding wheel layer 5 and remove the grinding wheel layer 5. Perform initial sharpening of the surface. In FIG. 8 b, the energization to the feeding electrode 6 is stopped and the grinding liquid 12 is supplied, while a constant cut by the grindstone body 3 is given to the inside of the cylindrical portion of the work material 2 to traverse grinding to the bottom surface of the cylindrical portion. I do. Then, the grindstone body 3 is returned to the initial position as shown in FIG. In FIG. 8 c, with the grinding fluid 12 being supplied, the current is again supplied between the feeding electrodes 6 and 7 via the grinding stone body 3 and the grinding fluid 12 to electrolyze the binder on the surface of the grinding stone layer 5 and remove the grinding stone. The surface of the layer 5 is sharpened. Thereafter, the steps of FIG. 8b and FIG. 8c are repeated at regular intervals.
[0004]
[Problems to be solved by the invention]
As described above, the above-described conventional grindstone electrolytic sharpening device is configured to alternately perform electrolytic sharpening and grinding while repeatedly driving the grindstone body 3 between the workpiece 2 and the feeding electrode 7 constituting the cathode. Therefore, although internal grinding with substantially the same diameter as the grindstone body is possible, there is a problem that the grinding efficiency is poor because an electrolytic sharpening time that is a non-grinding time is required.
[0005]
The present invention has been made to solve the above-mentioned problems, and its purpose is to enable the simultaneous progress of grinding and electrolytic sharpening, and to provide a grinding wheel that can continue grinding while maintaining the sharpness of the grindstone body. It is to obtain an electrolytic dressing device.
[0006]
[Means for Solving the Problems]
In the electrolytic stone sharpening device according to the first aspect of the present invention, the power supply electrode constituting the anode for energization is slidably contacted with the grindstone base metal, while the outer peripheral surface of the grindstone layer is A plurality of grooves are formed so as to be spaced apart in the circumferential direction, and a plurality of electrode bodies are fixedly spaced apart in the circumferential direction with an insulating layer interposed in the plurality of grooves, thereby forming a cathode for energization Is a portion in which the protruding portion located between the plurality of grooves in the grindstone layer is absent, and the plurality of electrode bodies and the insulator are slidably contacted with the portion alternately connected in the circumferential direction.
[0007]
According to a second aspect of the present invention, there is provided an electrolytic dressing device for a grindstone according to a second aspect of the present invention, the outer peripheral surface of the protrusion of the grindstone layer, the outer peripheral surface of the plurality of electrode bodies, and the outer peripheral surface of the insulator. Are formed almost flush with each other.
[0008]
According to a third aspect of the present invention, there is provided a grinding wheel electroplating device, wherein a power supply electrode constituting an anode for energization is slidably contacted with a grindstone base metal, and a power supply electrode and a grinding stone layer constituting the anode The conductive ring is fixed to the outer peripheral surface of the grindstone base metal between the power supply electrode constituting the anode and the grindstone layer via the insulating layer, and the conductive ring constitutes the cathode. While the feed electrode is slidably contacted, a plurality of grooves are formed on the outer peripheral surface of the grindstone layer so as to be spaced apart from each other in the circumferential direction, and a plurality of electrode bodies are interposed in the grooves in the circumferential direction. These electrode bodies and the conductive ring are connected to each other.
[0009]
According to a fourth aspect of the present invention, there is provided a grinding wheel electrolytic dressing apparatus in which a plurality of electrode bodies described in the third aspect are formed of carbon, free-cutting brass or conductive resin.
[0010]
According to a fifth aspect of the present invention, there is provided an electrolytic dressing device for a grindstone according to a fifth aspect of the present invention, wherein the insulating layer between the grindstone base metal and the conductive ring includes a plurality of conductive rings and grindstone layers. And a plurality of electrode bodies fixed to the outer peripheral surface of the grindstone layer and the conductive ring are bonded to each other with a conductive adhesive. Is.
[0011]
[Action]
In the grinding wheel electroplating device according to the first aspect of the present invention, the power supply electrode constituting the anode for energization is slidably contacted with the grinding wheel base metal, and a plurality of grooves are formed in the circumferential direction on the outer circumferential surface of the grinding wheel layer. A plurality of electrode bodies are formed in a plurality of grooves, and a plurality of electrode bodies are fixed in a circumferentially spaced manner with an insulating layer interposed therebetween. Power is supplied to the grindstone layer via the grindstone base metal by the slidable contact with the portions where the plurality of electrode bodies and insulators are alternately connected in the circumferential direction, which is a portion where there is no protruding portion located between them. Acts as an anode by feeding power from the electrode, multiple electrode bodies intermittently contact the feeding electrode and acts as a cathode, and electricity flows between the feeding electrodes through the grinding wheel base metal, grinding wheel layer and grinding fluid, and the grinding wheel layer protrudes The binder on the surface of the part melts by electrolysis and the grinding wheel layer Removed from the surface of the protrusion, the abrasive grains are exposed on the surface of the projecting portion of the grinding wheel layer, the surface of the protruding portion of the grindstone layer is dressed in roughness compatible with grinding.
[0012]
According to a second aspect of the present invention, there is provided an electrolytic dressing device for a grindstone, wherein an outer peripheral surface of a protrusion of a grindstone layer, an outer peripheral surface of a plurality of electrode bodies, and an outer peripheral surface of an insulator are formed substantially flush with each other. The feeding electrode can be slidably contacted.
[0013]
According to a third aspect of the present invention, there is provided a grinding wheel electroplating device, wherein a power supply electrode constituting an anode for energization is slidably contacted with a grindstone base metal, and is located between the power supply electrode constituting the anode and a grindstone layer. The conductive ring is fixed to the outer peripheral surface of the base metal through an insulating layer so as to be separated from the feeding electrode and the grindstone layer constituting the anode, and the feeding electrode constituting the cathode can be slidably contacted with the conductive ring. On the other hand, a plurality of grooves are formed on the outer peripheral surface of the grindstone layer so as to be spaced apart in the circumferential direction, and a plurality of electrode bodies are spaced apart and fixed in the circumferential direction with an insulating layer interposed therebetween. Since these electrode bodies and the conductive ring are connected to each other, power is supplied to all the electrode bodies at the same time, so that electrolytic scoring can be performed at all points of the grindstone layer.
[0014]
According to a fourth aspect of the present invention, there is provided a grinding wheel electroplating device, wherein the plurality of electrode bodies are made of carbon, free-cutting brass, or a conductive resin, so that the electrode bodies have the same amount of retraction due to wear of the grinding wheel layer by grinding. The wear retreats, the distance between the grindstone layer and the plurality of electrode bodies is always constant, and stable electrolytic dressing can be performed.
[0015]
According to a fifth aspect of the present invention, there is provided a grinding wheel electroplating apparatus, wherein the insulating layer between the grinding wheel base metal and the conductive ring is provided with a ridge that insulates the conductive ring and the protrusions located between the plurality of grooves in the grinding wheel layer. A plurality of electrode bodies fixed to the outer peripheral surface of the wrinkles and the grindstone layer and the conductive ring are bonded to each other with a conductive adhesive, thereby providing a simplified structure that does not use a lead wire. .
[0016]
【Example】
In the following, each embodiment of the present invention will be described with reference to FIG. 1 to FIG.
[0017]
Example 1.
FIG. 1a is a perspective view showing an electrolytic dressing device for a grindstone as Embodiment 1 of the present invention, FIG. 1b is a bottom view of the grindstone body shown in FIG. 1a, and FIG. 2 is a grindstone of Embodiment 1. The figure which shows an example of the manufacture process of a body, FIG. 3 is a figure which shows the example from which the manufacture process of the grindstone body of this Example 1 differs.
[0018]
In FIG. 1 and FIG. 1b, the outer peripheral surface of one end of the grindstone base metal 20 is slidably contacted with a power supply electrode 6 that is connected to an anode terminal of an electrolytic power source (not shown) and constitutes an anode. In the grindstone body 3, a grindstone layer 23 formed by bonding abrasive grains with a conductive binder is intimately fixed to the entire outer circumference of the other end of the grindstone base 20. A plurality of grooves 27 are formed so as to be spaced apart in the circumferential direction, and a plurality of electrode bodies 28 are spaced apart from each other in the circumferential direction with an insulating layer 22 made of an insulating resin such as an epoxy resin interposed therebetween. The outer peripheral surface of the insulating layer 22 interposed between the electrode body 28 and the outer peripheral surface of the electrode body 28 that is fixed and protrudes toward the one end portion side of the grindstone layer 23 from the protruding portion 23a positioned between the grooves 27 of the grindstone layer 23. A power supply electrode 21 that is connected to the cathode terminal of the electrolytic power source by an electric wire and constitutes the cathode is slidably contacted with the surface. It is brought into contact with the performance.
[0019]
The grindstone body 3 is manufactured, for example, in a process as shown in FIG. In the case of FIG. 2, one end of the grindstone layer 23 provided on the outer peripheral surface of the other end of the grindstone base 20 is ground to form a stepped portion 29, and a plurality of grooves 27 are formed around the outer peripheral surface of the grindstone layer 23. The plurality of electrode bodies 28 that are longer in the axial direction than the plurality of grooves 27 are formed, and the plurality of electrode bodies 28 are formed on the grindstone layer 23. The other end portion of the electrode body 28 is aligned with the other end portion of the grindstone layer 23 by adhering to the groove 27 with an epoxy-based insulating adhesive, and one end portion of the electrode body 28 is pivoted from one end portion of the grindstone layer 23. After protruding in the direction, the same insulating adhesive or insulating resin as described above is provided between the one end protruding from the grindstone layer 23 of the electrode body 28 and the grindstone base metal 20 and between one end of the grindstone layer 23. Is embedded by molding. The insulating layer 22 is composed of the insulating adhesive and the molded insulating adhesive or insulating resin. As a result, the grindstone body 3 shown in FIG. 1 is configured, and the grindstone layer 23, the plurality of electrode bodies 28, and the insulating layer 22 constitute a single body fixed to the outer peripheral surface of the other end of the grindstone base metal 20, The outer peripheral surface of the protrusion 23a positioned between the grooves 27 of the grindstone layer 23 constituting the outer peripheral surface of the single body, the outer peripheral surface of the plurality of electrode bodies 28, and the outer peripheral surface of the insulating layer 22 are substantially flush. . With respect to the same configuration of the outer peripheral surface, truing is performed on the assembly machine, so that the outer peripheral surface of the projecting portion 23a located between the grooves 27 of the grindstone layer 23, the outer peripheral surface of the plurality of electrode bodies 28, and the insulating layer 22 Since the step with the outer peripheral surface can be adjusted to 1 μm or less, the feeding electrode 21 can be slidably contacted.
[0020]
In the case of FIG. 3, a plurality of grooves 27 are equally arranged in the circumferential direction on the outer peripheral surface of the grindstone layer 23 formed in a cylindrical shape to be linearly formed in the axial direction. A plurality of electrode bodies 28 having a long direction length are formed, and the plurality of electrode bodies 28 are bonded to the grooves 27 of the grindstone layer 23 with an epoxy-based insulating adhesive, and the other end of the electrode body 28 is attached to the grindstone layer. 23, one end portion of the electrode body 28 is protruded in the axial direction from one end portion of the grindstone layer 23, and the grindstone base metal 20 is press-fitted into a through hole 23b formed in the center of the grindstone layer 23. After making one end of the grindstone base 20 protrude from one end of the grindstone layer 23, between the one end projecting from the grindstone layer 23 of the electrode body 28 and the grindstone base 20 and between one end of the grindstone layer 23. Fill each with the same insulating adhesive or insulating resin as above. Inclusive, by the the mold molded insulative adhesive and the insulating adhesive to the insulating layer 22, as a result, constituting the grindstone body 3 shown in FIG.
[0021]
According to the first embodiment, the grindstone body 3 rotates in the direction of the arrow shown in FIG. 1a, and the grindstone layer 23 functions as an anode by the power feeding from the power feeding electrode 6 via the grindstone base metal 20, thereby providing a plurality of electrode bodies. 28 intermittently contacts the power supply electrode 21 to act as a cathode, and electricity flows between the power supply electrodes 6, 21 through the grindstone base 20, the grindstone layer 23, and the grinding fluid 12, and the surface of the protrusion 23 a of the grindstone layer 23. The binder is melted by electrolysis and removed from the surface of the protrusion 23a of the grindstone layer 23, the abrasive grains are exposed on the surface of the protrusion 23a of the grindstone layer 23, and the surface of the protrusion 23a of the grindstone layer 23 is suitable for grinding. It is conspicuous to the roughness to do.
[0022]
In short, in the first embodiment, since the plurality of electrode bodies 28 are fixed to the outer peripheral surface of the grindstone layer 23 so as to be spaced apart from each other in the circumferential direction, power can be supplied only to the electrode bodies 28 that are not in contact with the work material 2. As a result, the grinding wheel layer 23 can be sharpened while grinding the conductive work material without leaking even with a rotary chuck made of a metal material, so that the rotation made of a conventional metal material can be performed. A chuck can be used. Further, the characteristics of the material used for the plurality of electrode bodies 28 are that the formability during truing is good, plastic deformation occurs during processing, but it does not reach the grindstone layer 23 side, and there is electrical conductivity. That is, the electrode body 28 is preferably a brittle material that exhibits electrical conductivity. For example, the electrode body 28 is made of carbon, free-cutting brass, conductive resin, or the like, so that the grindstone layer 23 is retracted due to grinding. Since the electrode body 28 wears and retreats by the same amount as the amount, the distance between the grindstone layer 23 and the plurality of electrode bodies 28 is always constant, and stable electrolytic dressing can be performed.
[0023]
Example 2
FIG. 4 is a perspective view showing an electrolytic sharpening device for a grindstone as Embodiment 2 of the present invention. In FIG. 4, the power supply electrode 6 constituting the anode is slidably contacted with the outer peripheral surface of one end portion of the grindstone base metal 20, and the grindstone body 3 is attached to the entire outer periphery of the other end portion of the grindstone base metal 20. The layer 23 is closely fixed, and a plurality of grooves 27 are equally arranged in the circumferential direction on the outer peripheral surface of the grindstone layer 23 and are linearly formed in the axial direction. Each of the plurality of grooves 27 has a plurality of electrodes. The body 28 is individually fixed with an insulating layer 22 made of an insulating resin such as an epoxy resin interposed, and on the outer peripheral surface of the portion located between the grindstone layer 23 of the grindstone base metal 20 and the power feeding electrode 6. The ring insulating layer 30 is fixed intimately, and a conductive ring 31 is fixed intimately on the outer peripheral surface of the ring insulating layer 30. A power supply electrode 21 configured as a cathode is slidably contacted with the outer peripheral surface of the conductive ring 31, and a plurality of electrode bodies 28 are connected to the conductive ring 31 with lead wires 32.
[0024]
According to the second embodiment, when the electrode body 28 is made of carbon, free-cutting brass, conductive resin, or the like, the electrode body 28 wears and retreats by the same amount as the retraction amount due to wear of the grindstone layer 23 by grinding. Therefore, the distance between the grindstone layer 23 and the plurality of electrode bodies 28 is always constant, and stable electrolytic dressing can be performed. In addition, since power is supplied to all the electrode bodies 28 at the same time, electroplating can be performed at all locations on the grindstone layer 23. As a result, it is possible to continue grinding while maintaining a good and stable sharpness.
[0025]
Example 3
FIG. 5 is a perspective view showing an electrolytic dressing device for a grindstone as Embodiment 3 of the present invention, and FIG. 6 is a view showing an example of the manufacturing process of the grindstone body of Embodiment 3.
In FIG. 5, the feeding electrode 6 constituting the anode is slidably contacted with the outer peripheral surface of one end portion of the grindstone base metal 20, and the grindstone layer 23 is in close contact with the entire outer peripheral surface of the other end portion of the grindstone base metal 20. A plurality of grooves 27 are equally arranged in the circumferential direction on the outer peripheral surface of the grindstone layer 23 and are linearly formed in the axial direction. A conductive ring 31 is provided on the outer peripheral surface of a portion located between the grinding wheel layer 23 of the grinding wheel base metal 20 and the power feeding electrode 6, and is fixed individually with an insulating layer 22 made of an insulating resin such as a system interposed. Are closely fixed to each other through the ring insulating layer 30, and one end surfaces of the plurality of electrode bodies 28 are connected to the lower end surface of the conductive ring 31 with a conductive adhesive 33. Is in contact with a power supply electrode 21 configured as a cathode in a slidable manner.
[0026]
The grindstone body 3 of the third embodiment is manufactured in a process as shown in FIG. 6, for example. In FIG. 6, a plurality of grooves 27 are equally arranged in the circumferential direction on the outer peripheral surface of the grindstone layer 23 formed in a cylindrical shape to be linearly formed in the axial direction. A plurality of long electrode bodies 28 are formed, and the plurality of electrode bodies 28 are bonded to the grooves 27 of the grindstone layer 23 with an epoxy insulating adhesive, and the other end of the electrode body 28 is attached to the grindstone layer 23. While aligning with the other end, one end of the electrode body 28 protrudes from the one end of the grindstone layer 23 in the axial direction. The ring insulating layer 30 has a flange 30b at the other end of the cylindrical body 30a, and has a plurality of grooves 30c on the outer peripheral surface of the flange 30b. The ring insulating layer 30 is bonded to the intermediate portion of the grindstone base metal 20. The conductive ring 31 is externally fitted to the cylindrical body 30a of the ring insulating layer 30 with the adhesive 33 interposed, and the lower end surface of the conductive ring 31 is attached to the ring insulating layer 30. The upper surface of the gutter 30b is bonded with a conductive adhesive 33, and the other end of the grindstone base metal 20 is press-fitted into a through hole 23b formed in the center of the grindstone layer 23 having the plurality of electrode bodies 28, and the ring An electrode body 28 protruding from the grindstone layer 23 is inserted into the groove 30c of the insulating layer 30, and one end face of the electrode body 28 is bonded to the lower end face of the conductive ring 31 with a conductive adhesive 33, as shown in FIG. The grindstone body 3 to be shown is constituted.
[0027]
According to the third embodiment, compared to the second embodiment, a simplified structure that does not use a lead wire is obtained.
[0028]
In the above-described Examples 1 to 3, the shaft type grindstone body 3 is illustrated and described. However, in the present invention, it is of course possible to use a flat grindstone or a cup shape or a thin blade grindstone on the kind of grindstone of a general grinding tool. It is.
[0029]
【The invention's effect】
According to the first invention, the feeding electrode constituting the anode for energization is slidably contacted with the grindstone base metal, while the outer circumferential surface of the grindstone layer has a plurality of grooves spaced apart in the circumferential direction. The plurality of electrode bodies are formed in the plurality of grooves and fixed in a circumferentially spaced manner with an insulating layer interposed therebetween, and the feeding electrode constituting the cathode for energization is located between the plurality of grooves in the grindstone layer Since the plurality of electrode bodies and the insulators are slidably contacted with the circumferentially alternating portions where the protrusions are absent, the grindstone layer is fed by power from the power feeding electrode via the grindstone base metal. Acts as an anode, multiple electrode bodies intermittently contact the power supply electrode and acts as a cathode, and electricity flows between the power supply electrodes through the grindstone base metal, the grindstone layer, and the grinding fluid, and the surface of the protruding portion of the grindstone layer is coupled The agent melts by electrolysis and is removed from the surface of the protrusion of the grinding wheel layer. , Abrasive grains are exposed on the surface of the projecting portion of the grinding wheel layer, the surface of the projecting portion of the grinding wheel layer is an effect that can be sharpened to a roughness compatible with grinding.
[0030]
According to the second invention, the outer peripheral surface of the protruding portion of the grindstone layer, the outer peripheral surfaces of the plurality of electrode bodies, and the outer peripheral surface of the insulator are formed substantially flush with each other. There is an effect that it can be in sliding contact.
[0031]
According to the third aspect of the present invention, the outer periphery of the grindstone base metal that is slidably contacted with the grindstone base metal and that is located between the power feeding electrode that constitutes the anode and the grindstone layer is provided. The conductive ring is fixed to the surface in a form separated from the power supply electrode constituting the anode and the grindstone layer via an insulating layer, and the power supply electrode constituting the cathode is slidably contacted with the conductive ring. A plurality of grooves are formed on the outer peripheral surface of the grindstone layer so as to be spaced apart in the circumferential direction, and a plurality of electrode bodies are spaced apart and fixed in the circumferential direction with an insulating layer interposed therebetween. Since the body and the conductive ring are connected to each other, power is supplied to all the electrode bodies at the same time, and there is an effect that the electrolytic sharpening can be performed at all points of the grindstone layer.
[0032]
According to the fourth invention, since the plurality of electrode bodies are formed of carbon, free-cutting brass, or conductive resin, the electrode bodies are worn and retracted by the same amount as the retraction amount due to wear of the grinding wheel layer by grinding. The distance between the layer and the plurality of electrode bodies is always constant, and there is an effect that stable electrolytic dressing can be performed.
[0033]
According to the fifth invention, the insulating layer between the grindstone base metal and the conductive ring is provided with the flange that insulates the conductive ring and the protrusions located between the plurality of grooves in the grindstone layer. Since the plurality of electrode bodies fixed to the outer peripheral surface of the ridge and the grindstone layer and the conductive ring are bonded to each other with a conductive adhesive, there is an effect that the structure is simplified without using a lead wire.
[Brief description of the drawings]
FIGS. 1A and 1B are diagrams showing an electrolytic sharpening device for a grindstone according to a first embodiment, in which FIG. 1a is a perspective view, and FIG.
FIG. 2 is a diagram illustrating an example of a manufacturing process of the grindstone body according to the first embodiment.
3 is a view showing a different example of the manufacturing process of the grindstone body of Example 1. FIG.
4 is a perspective view showing an electrolytic sharpening device for a grindstone of Example 2. FIG.
5 is a perspective view showing an electrolytic sharpening device for a grindstone of Example 3. FIG.
6 is a diagram showing an example of a manufacturing process of a grindstone body of Example 3. FIG.
FIG. 7 is a perspective view showing a conventional electrolytic sharpening device for a grindstone.
FIG. 8 is an explanatory view of the operation of the conventional electroplating device for a grindstone.
[Explanation of symbols]
2 Work material
3 Grindstone
6 Feeding electrode
12 Grinding fluid
20 Whetstone base metal
21 Feeding electrode
22 Insulating layer
23 Whetstone layer
23a Projection of the grinding wheel layer
27 groove
28 Electrode body
30 Ring insulation layer
30b 鍔
31 Conductive ring
33 Conductive adhesive

Claims

By electrolyzing the conductive binder that binds the abrasive grains of the grindstone layer formed on the outer peripheral surface of the grindstone base metal having conductivity in the grindstone body while being supplied with the conductive grinding fluid. In the electrolytic grinding device for grinding wheel for sharpening the grinding wheel layer, the power supply electrode constituting the anode for energization is slidably contacted with the grinding wheel base metal, while a plurality of grooves are formed on the outer peripheral surface of the grinding wheel layer. A plurality of electrode bodies are formed spaced apart in the circumferential direction, and a plurality of electrode bodies are fixedly spaced apart in the circumferential direction with an insulating layer interposed therebetween. In the electrolysis of a grindstone, characterized in that a plurality of electrode bodies and insulators are slidably contacted with portions that are alternately connected in the circumferential direction, and are portions where the protrusions located between the plurality of grooves are absent Sharpening device.

2. The grinding wheel electroplating apparatus according to claim 1, wherein the outer peripheral surface of the protrusion of the grindstone layer, the outer peripheral surfaces of the plurality of electrode bodies, and the outer peripheral surface of the insulator are formed substantially flush with each other.

Conduction in a state where a conductive binder is used to bond abrasive particles of a grinding wheel layer formed by interposing an insulating layer on an outer peripheral surface of a grinding wheel base metal having conductivity in a grinding wheel body. In the grinding wheel electrolytic dressing device for sharpening the grinding wheel layer by being electrolyzed, the feeding electrode constituting the anode for energization is slidably contacted with the grinding wheel base metal, and the feeding electrode constituting the anode A conductive ring is fixed to the outer peripheral surface of the grindstone base metal located between the grindstone layer in a form separated from the power supply electrode constituting the anode and the grindstone layer via an insulating layer, and a cathode is attached to the conductive ring. While the power supply electrodes that make up are slidably contacted, a plurality of grooves are formed on the outer peripheral surface of the grindstone layer so as to be spaced apart in the circumferential direction, and a plurality of electrode bodies interpose an insulating layer in these grooves. These are fixed and spaced apart in the circumferential direction. Electrolytic dressing device of the grinding wheel, characterized in that polar body and the said conductive ring are connected to each other.

4. The grindstone electrolytic dressing device according to claim 3, wherein the plurality of electrode bodies are made of carbon, free-cutting brass or conductive resin.

The insulating layer between the grindstone base metal and the conductive ring is provided with ridges that insulate the conductive ring and the protrusions located between the plurality of grooves in the grindstone layer. 4. The grindstone electrolytic dressing device according to claim 3, wherein the plurality of fixed electrode bodies and the conductive ring are bonded to each other with a conductive adhesive.