JP4126861B2 - Cutout material takeout device for wire electric discharge machine - Google Patents

Cutout material takeout device for wire electric discharge machine Download PDF

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JP4126861B2
JP4126861B2 JP2000292101A JP2000292101A JP4126861B2 JP 4126861 B2 JP4126861 B2 JP 4126861B2 JP 2000292101 A JP2000292101 A JP 2000292101A JP 2000292101 A JP2000292101 A JP 2000292101A JP 4126861 B2 JP4126861 B2 JP 4126861B2
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magnetic
electromagnet
cutout
electric discharge
workpiece
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JP2002103144A (en
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武志 入野
健二 佐藤
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Description

【０００１】
【発明の属する技術分野】
この発明は、ワイヤ放電加工により被加工物から切り抜いた切り抜き材を磁気吸引力により吸着して取り出す、ワイヤ放電加工機の切り抜き材取り出し装置の改良に関するものである。
【０００２】
【従来の技術】
ワイヤ放電加工機により加工する被加工物の材質は合金工具鋼又は超硬合金等であり、そのほとんどが磁性体の素材であるため、切り抜き材の取り出しは磁石の磁気吸引力による吸着を利用して行われるのが通常である。
【０００３】
図４は、従来のワイヤ放電加工機の切り抜き材取り出し装置における切り抜き材を吸着する電磁石まわりの構成図であり、図において、１は磁石ホルダ、２は磁石ホルダ１に保持された磁気吸着手段である電磁石、３は被加工物母材、４はワイヤ放電加工により被加工物母材３から切り抜かれ電磁石２により吸着された切り抜き材である。磁石ホルダ１は、図示しないエアシリンダ及びサーボモータ等のアクチュエータ、ボールねじ及びスプライン軸等の伝達機構並びに直線案内等により構成された駆動手段により駆動され、電磁石２と被加工物母材３との相対位置決め及び電磁石２により吸着した切り抜き材４の取り出しが可能な構成となっている。
【０００４】
次に動作について説明する。前記駆動手段により磁石ホルダ１に保持された電磁石２と被加工物母材３との相対位置決めを行った後、電磁石２を直流電流で励磁し、被加工物母材３からワイヤ放電加工により切り抜かれた切り抜き材４の上面に接触させて切り抜き材４を吸着する。次に前記駆動手段により切り抜き材４を被加工物母材３から取り出した後、図示しない切り抜き材ストッカの上部まで搬送する。この状態において、電磁石２の励磁電流をオフとして、切り抜き材ストッカ内に切り抜き材を落下させる。
【０００５】
このような従来のワイヤ放電加工機の切り抜き材取り出し装置として、特開昭６３−１８５５３１号公報には、複数個の電磁石を全面に固定し、通電する範囲を制御することにより、切り抜き材の形状に合わせた電磁吸引力を得るワイヤ放電加工機の切り抜き材取り出し装置が開示されている。
【０００６】
また、特開平４−１２９６１５号公報には、ノズルに電磁石を組み込んだ構成のワイヤ放電加工機の切り抜き材取り出し装置が開示されている。
【０００７】
【発明が解決しようとする課題】
前記のような従来のワイヤ放電加工機の切り抜き材取り出し装置の磁気吸着手段は、電磁石若しくは永久磁石又は電磁石及び永久磁石の組み合わせにより構成されている。
【０００８】
図５は、切り抜き材４を吸着する磁気吸着手段として用いられる電磁石及び永久磁石の構成例を示す説明図であり、２ａ及び２ｂは電磁石、４は切り抜き材、４ａは切り抜き材４の吸着面、５ａ及び５ｂは永久磁石、６は鉄心、７はコイル、８はヨークである。
【０００９】
図５の（ａ）又は（ｂ）は吸着面４ａにＮ極とＳ極の両極を接触させて吸着する磁気吸着手段の構成を示している。Ｎ極とＳ極との間隔を狭くすると、Ｎ極及びＳ極の自由磁極から磁力線が放出され磁気エネルギの損失を伴い、切り抜き材４内部を通る磁束が減少して磁気吸引力が低下するため、Ｎ極とＳ極との間隔を狭くすることはできない。従って、このような構成の磁気吸着手段は吸着面４ａの面積が小さい場合には適していない。
【００１０】
図５の（ｃ）又は（ｄ）は吸着面４ａにＮ極又はＳ極を接触させて吸着する磁気吸着手段の構成を示している。このような構成の磁気吸着手段は吸着面４ａの面積が小さい場合にも適している。例えば、吸着面４ａの面積が２０ｍｍ2程度の場合でも吸着可能である。
【００１１】
図６は、被加工物母材３から切り抜き材４を取り出す過程を示す説明図であり、図５の（ｃ）又は（ｄ）のようにＮ極又はＳ極を接触させて吸着する構成の磁気吸着手段である電磁石２ｂ又は永久磁石５ｂを用いた場合を示している。また、Ｇは磁力線の方向を模式的に示したものである。
【００１２】
切り抜き材４は磁性体であるため、図６のように電磁石２ｂ又は永久磁石５ｂのＮ極により吸着された状態において、切り抜き材４は一次磁石となり、磁力線の方向はＧのようになる。従って、切り抜き材４と被加工物母材３との間に磁気吸引力が発生する。
【００１３】
このような構成の従来のワイヤ放電加工機の切り抜き材取り出し装置では、切り抜き材４と被加工物母材３との間の磁気吸引力と切り抜き材４の自重が加算され、その力が電磁石２ｂ又は永久磁石５ｂと切り抜き材４との間の磁気吸引力より大きくなると、切り抜き材４は電磁石２ｂ又は永久磁石５ｂから離脱し、切り抜き材４の取り出しに失敗することになる。また、特に被加工物の厚さが厚く切り抜き材の重量が重い場合等では、図６のように切り抜き材４を被加工物母材３から取り出す過程において、切り抜き材４と被加工物母材３との間隙（図中Ａ）が全周で均一にはならないため、切り抜き材４と被加工物母材３との間の磁気吸引力により切り抜き材４にモーメント（例えば、図中のＸ軸まわりのモーメント）が発生し、このモーメントが増大して切り抜き材４が落下する等、切り抜き材４の取り出しの信頼性が低下するという問題点があった。
【００１４】
この発明は、前記のような課題を解決するためになされたものであり、切り抜き材の吸着面積が小さい場合にも適用できると共に切り抜き材取り出しの高信頼化を図ることができるワイヤ放電加工機の切り抜き材取り出し装置を得ることを目的とする。
【００１５】
【課題を解決するための手段】
この発明に係るワイヤ放電加工機の切り抜き材取り出し装置は、ワイヤ放電加工により被加工物から切り抜いた切り抜き材を磁気吸引力により吸着して取り出すワイヤ放電加工機の切り抜き材取り出し装置において、前記切り抜き材の吸着面にＮ極又はＳ極を接触させて吸着する磁気吸着手段と、少なくとも１個の補助電磁石と、前記磁気吸着手段と前記被加工物との相対位置決め及び前記磁気吸着手段により吸着した前記切り抜き材の取り出しを行う駆動手段と、前記補助電磁石の前記磁気吸着手段に対する相対位置を可変とする直線駆動手段と、前記切り抜き材の前記磁気吸着手段による吸着時に前記補助電磁石を前記切り抜き材の近傍に配置し、前記磁気吸着手段の磁束の方向と前記補助電磁石の磁束の方向とを合わせて前記磁気吸着手段と前記切り抜き材との間の磁束が増加するように前記補助電磁石を励磁する第１の制御と、前記切り抜き材の前記被加工物からの取り出しの所定の中間状態から取り出し完了までの間に前記補助電磁石を前記被加工物近傍に配置し、前記磁気吸着手段及び前記切り抜き材周りの磁束の方向と前記補助電磁石の磁束の方向とを逆にして前記切り抜き材と前記被加工物との間の磁束が減少するように前記補助電磁石を励磁する第２の制御を行う制御手段とを備えたものである。
【００１６】
また、この発明に係るワイヤ放電加工機の切り抜き材取り出し装置は、前記磁気吸着手段が電磁石又は永久磁石であるものである。
【００１７】
【発明の実施の形態】
実施の形態１．
図１は、この発明の実施の形態１に係るワイヤ放電加工機の切り抜き材取り出し装置の構成図であり、図において、１は磁石ホルダ、３は被加工物母材、４はワイヤ放電加工により被加工物母材３から切り抜かれた切り抜き材、４ａは切り抜き材４の吸着面、９は補助電磁石、９ａはコイル、９ｂはヨーク、１０は図示しないワイヤ電極をガイドする下部ノズルである。また、２ｂ及び５ｂは従来技術の図５の（ｃ）及び（ｄ）と同様であり、即ち、２ｂはＮ極又はＳ極を接触させて吸着する構成の磁気吸着手段として用いられる電磁石、５ｂはＮ極又はＳ極を接触させて吸着する構成の磁気吸着手段として用いられる永久磁石である。図１の構成では、磁気吸着手段として電磁石２ｂ又は永久磁石５ｂを用いている。
【００１８】
磁石ホルダ１は、図示しないエアシリンダ及びサーボモータ等のアクチュエータ、ボールねじ及びスプライン軸等の伝達機構並びに直線案内等により構成された駆動手段により駆動され、磁気吸着手段である電磁石２ｂ又は永久磁石５ｂと被加工物母材３との相対位置決め及び吸着した切り抜き材４の取り出しが可能な構成となっている。
【００１９】
補助電磁石９は、図１の（ａ）のように切り抜き材４の吸着時においては電磁石２ｂ又は永久磁石５ｂの周囲を覆うように吸着面４ａの近傍に配置され、切り抜き材４の被加工物母材３からの取り出し途中から図１の（ｂ）のような取り出し完了時点までにおいては切り抜き材４の周囲を覆うように被加工物母材３の近傍に配置される。
【００２０】
このように補助電磁石９と磁気吸着手段である電磁石２ｂ又は永久磁石５ｂとの相対位置を切り抜き材４の取り出し方向（図中Ｂ方向）に可変とできるように、補助電磁石９は例えば図示しないエアシリンダ及び直線案内、又はボールねじ、サーボモータ及び直線案内により構成される直線駆動手段により磁気吸着手段である電磁石２ｂ又は永久磁石５ｂに対して駆動される。
【００２１】
また、前記駆動手段及び直線駆動手段の駆動制御並びに電磁石２ｂ及び補助電磁石９の励磁等所定の制御は図示しない制御手段により行われる。
【００２２】
次に動作について説明する。図２は、この発明の実施の形態１に係るワイヤ放電加工機の切り抜き材取り出し装置の動作説明図であり、図において、図１と同一符号は同一又は相当部分を示している。図２において、Ａは切り抜き材４と被加工物母材３との間隙、Ｇ１は電磁石２ｂ又は永久磁石５ｂによる磁力線、Ｇ２は切り抜き材４吸着時における補助電磁石９による磁力線、Ｇ３は電磁石２ｂ又は永久磁石５ｂ及び切り抜き材４周りの磁力線、Ｇ４は切り抜き材４の被加工物母材３からの取り出し完了間際における補助電磁石９による磁力線を示しており、磁力線の方向は模式的に示している。
【００２３】
図２の（ａ）は、被加工物母材３から切り抜き材４を取り出すために電磁石２ｂ又は永久磁石５ｂにより切り抜き材４を吸着する直前の状態を示している。電磁石２ｂ又は永久磁石５ｂと補助電磁石９を切り抜き材４の近傍に配置し、かつ、電磁石２ｂ又は永久磁石５ｂによる磁束の方向（磁力線Ｇ１）と補助電磁石９による磁束の方向（磁力線Ｇ２）とを合わせるように（磁束が増加するように）電磁石を励磁する。このようにすることにより、切り抜き材４に作用する磁気吸引力が電磁石２ｂ又は永久磁石５ｂのみの場合の例えば数倍程度に増加し、図２の（ａ）に示すように下部ノズル１０の上に切り抜き材４が落ちている場合においても、より確実に切り抜き材４の磁気吸引力による吸着を行うことができる。
【００２４】
図２の（ｂ）は、切り抜き材４の被加工物母材３からの取り出し完了間際の状態を示している。前記直線駆動手段により、補助電磁石９と磁石ホルダ１及び電磁石２ｂ又は永久磁石５ｂとの相対位置を変化させることができるため、切り抜き材４の被加工物母材３からの取り出しの所定の中間状態から取り出し完了までの間、補助電磁石９を被加工物母材３近傍に配置している。切り抜き材４の被加工物母材３からの取り出しの所定の中間状態から取り出し完了までにおいて、電磁石２ｂ又は永久磁石５ｂ及び切り抜き材４周りの磁束の方向（磁力線Ｇ３）と補助電磁石９による磁束の方向（磁力線Ｇ４）とを逆にするように（磁束が減少するように）、補助電磁石９を励磁する。このようにすることにより、切り抜き材４と切り抜き材４と被加工物母材３との間隙（図２の（ｂ）中のＡ）に働く磁気吸引力を抑制することができる。従って、発明が解決しようとする課題の図６で説明したような切り抜き材４の落下に結びつくモーメントを低減することができる。また、切り抜き材４と被加工物母材３との間隙に働く磁気吸引力が抑制されるため、この磁気吸引力に切り抜き材４の自重を加算しても、電磁石２ｂ又は永久磁石５ｂと切り抜き材４との間に働く磁気吸引力より大きくなることはない。従って、切り抜き材４を被加工物母材３から確実に取り出すことができる。
【００２５】
前記のように電磁石２ｂ又は永久磁石５ｂ及び切り抜き材４周りの磁束の方向（磁力線Ｇ３）と補助電磁石９による磁束の方向（磁力線Ｇ４）とを逆にするように補助電磁石９の励磁を開始する、切り抜き材４の被加工物母材３からの取り出しの所定の中間状態位置については、被加工物母材３の板厚、ワイヤ電極の直径及び加工形状等により最適な位置が異なるため、切り抜き材４を取り出す実験により予め求めておくことができる。あるいは、切り抜き材４の被加工物母材３からの取り出し完了前の所定位置（例えば被加工物母材３の板厚の１／５乃至１／１０程度）を前記所定の中間状態位置としてもよい。このように、切り抜き材４が被加工物母材３から抜き出る前から、電磁石２ｂ又は永久磁石５ｂ及び切り抜き材４周りの磁束の方向（磁力線Ｇ３）と補助電磁石９による磁束の方向（磁力線Ｇ４）とを逆にするように補助電磁石９の励磁を行うことにより、切り抜き材取り出しの高信頼化を図ることができる。
【００２６】
このようにして被加工物母材３から確実に取り出された切り抜き材４は、前記駆動手段により例えば図示しない切り抜き材ストッカの上部まで搬送される。この状態において、磁気吸着手段として電磁石２ｂを用いる場合は、電磁石２ｂの励磁電流をオフにして切り抜き材ストッカ内に切り抜き材４を落下させる。また、磁気吸着手段として永久磁石５ｂを用いる場合は、前記直線駆動手段により補助電磁石９を永久磁石５ｂ近傍に移動させ、永久磁石５ｂの磁束の方向と逆の方向の磁束を発生させるように補助電磁石９の励磁することにより、切り抜き材４に作用する磁気吸引力を切り抜き材４の自重以下とし、切り抜き材ストッカ内に切り抜き材４を落下させる。この場合において、永久磁石５ｂが減磁しないように前記制御手段によって補助電磁石９に流す電流の方向、時間及び最大値を制御する。
【００２７】
以上のように、切り抜き材４に作用する磁気吸引力を吸着時に大きくし、切り抜き材４の端部が被加工物母材３から抜け出る時には切り抜き材４と被加工物母材３との間に働く磁気吸引力を小さくしたので、切り抜き材４の吸着不能又は取り出し途中での切り抜き材４の落下を無くすことができる。従って、被加工物母材３からの切り抜き材４の取り出しの高信頼化を図ることができる。例えば、切り抜き材４の吸着面４ａの面積が２０ｍｍ2程度と小さく、切り抜き材４の長さ（被加工物母材３の厚さ）が５０ｍｍ程度と長い場合でも、切り抜き材４の被加工物母材３からの取り出しを確実に行うことができる。
【００２８】
以上において、磁気吸着手段として永久磁石５ｂを用いた場合には、停電時における切り抜き材４の落下を防止することができるという効果もある。
【００２９】
また、以上においては、磁気吸着手段として電磁石２ｂ又は永久磁石５ｂを用いる場合について説明したが、磁化された電磁軟鉄等の電磁石以外の一次磁石を磁気吸着手段として用いてもよい。
【００３０】
実施の形態２．
図３は、この発明の実施の形態２に係るワイヤ放電加工機の切り抜き材取り出し装置の構成図であり、実施の形態１の図１と同一符号は同一又は相当部分を示している。図３において、１１は第２の補助電磁石、１１ａはコイル、１１ｂはヨークであり、磁気吸着手段としては永久磁石５ｂを用いている。
【００３１】
補助電磁石９の動作は、実施の形態１の図２と同様である。第２の補助電磁石１１は、図３の（ａ）のような切り抜き材４の吸着時においては永久磁石５ｂ及び補助電磁石９の近傍に配置され、永久磁石５ｂによる磁束の方向及び補助電磁石９による磁束の方向に加えてさらに磁束が増加するように励磁される。このようにすることにより、切り抜き材４に作用する磁気吸引力がさらに増加し、切り抜き材４の重量がより重い場合等においても、より確実に切り抜き材４の吸着を行うことができるため、切り抜き材４取り出しの信頼性がさらに向上する。
【００３２】
また、このように第２の補助電磁石１１を用いる場合には、図３の（ａ）及び（ｂ）のように第２の補助電磁石１１と永久磁石５ｂとの相対位置を固定として、例えば、切り抜き材４を取り出し後、切り抜き材ストッカ上部へ搬送し、永久磁石５ｂの磁束の方向と逆の方向の磁束を発生させるように第２の補助電磁石１１を励磁することにより切り抜き材４を切り抜き材ストッカ内への落下させることができる。
【００３３】
また、第２の補助電磁石１１と永久磁石５ｂとの相対位置を可変として補助電磁石９と同様に移動可能としてもよい。
【００３４】
以上においては、補助電磁石として、補助電磁石９及び第２の補助電磁石１１の２個を用いる場合について説明したが、補助電磁石の数は２個に限定されるものではなく、３個以上の補助電磁石を用いてもよい。
【００３５】
【発明の効果】
この発明に係るワイヤ放電加工機の切り抜き材取り出し装置は、以上説明したように構成されているので、切り抜き材の吸着面積が小さい場合又は切り抜き材の重量が重い場合等にも適用できると共に切り抜き材取り出しの高信頼化を図ることができるという効果を奏する。
【図面の簡単な説明】
【図１】 この発明の実施の形態１に係るワイヤ放電加工機の切り抜き材取り出し装置の構成図である。
【図２】 この発明の実施の形態１に係るワイヤ放電加工機の切り抜き材取り出し装置の動作説明図である。
【図３】 この発明の実施の形態２に係るワイヤ放電加工機の切り抜き材取り出し装置の構成図である。
【図４】 従来のワイヤ放電加工機の切り抜き材取り出し装置における切り抜き材を吸着する電磁石まわりの構成図である。
【図５】 磁気吸着手段として用いられる電磁石及び永久磁石の構成例を示す説明図である。
【図６】 切り抜き材を被加工物母材から取り出す過程を示す説明図である。
【符号の説明】
１ 磁石ホルダ、２ｂ 電磁石、３ 被加工物母材、４ 切り抜き材、４ａ 吸着面、５ｂ 永久磁石、９ 補助電磁石、９ａ コイル、９ｂ ヨーク、１０下部ノズル、Ｇ１、Ｇ２、Ｇ３、Ｇ４ 磁力線。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a cutting material take-out device for a wire electric discharge machine, in which a cutting material cut out from a workpiece by wire electric discharge machining is attracted and taken out by a magnetic attraction force.
[0002]
[Prior art]
The material of the workpiece to be processed by the wire electric discharge machine is alloy tool steel or cemented carbide, etc., and most of them are magnetic materials, so the cutting material is taken out by using the magnetic attraction force of the magnet. This is usually done.
[0003]
FIG. 4 is a configuration diagram around an electromagnet that adsorbs a cutout material in a cutout material takeout device of a conventional wire electric discharge machine. In the figure, 1 is a magnet holder, and 2 is a magnetic adsorption means held by the magnet holder 1. A certain electromagnet, 3 is a workpiece base material, and 4 is a cutout material cut out from the workpiece base material 3 by wire electric discharge machining and adsorbed by the electromagnet 2. The magnet holder 1 is driven by driving means constituted by an actuator (not shown) such as an air cylinder and a servo motor, a transmission mechanism such as a ball screw and a spline shaft, and a linear guide, and the like, and an electromagnet 2 and a workpiece base material 3 are connected to each other. The relative positioning and the cutting material 4 adsorbed by the electromagnet 2 can be taken out.
[0004]
Next, the operation will be described. After the electromagnet 2 held on the magnet holder 1 and the workpiece base material 3 are positioned relative to each other by the driving means, the electromagnet 2 is excited by a direct current and cut from the workpiece base material 3 by wire electric discharge machining. The cutout material 4 is adsorbed by being brought into contact with the upper surface of the cutout cutout material 4. Next, after the cutting material 4 is taken out from the workpiece base material 3 by the driving means, it is transported to the upper part of a cutting material stocker (not shown). In this state, the exciting current of the electromagnet 2 is turned off, and the cutting material is dropped into the cutting material stocker.
[0005]
As a cutting material take-out device for such a conventional wire electric discharge machine, Japanese Patent Application Laid-Open No. 63-185531 discloses a shape of a cutting material by fixing a plurality of electromagnets on the entire surface and controlling a range of energization. A cut-out material take-out device for a wire electric discharge machine that obtains an electromagnetic attraction force adapted to the above is disclosed.
[0006]
Japanese Patent Application Laid-Open No. 4-129615 discloses a cutting material take-out device for a wire electric discharge machine having a configuration in which an electromagnet is incorporated in a nozzle.
[0007]
[Problems to be solved by the invention]
The magnetic attraction means of the conventional cutout material take-out device of the wire electric discharge machine as described above is composed of an electromagnet, a permanent magnet, or a combination of an electromagnet and a permanent magnet.
[0008]
FIG. 5 is an explanatory view showing a configuration example of an electromagnet and a permanent magnet used as magnetic adsorption means for adsorbing the cutout material 4, 2a and 2b are electromagnets, 4 is a cutout material, 4a is an adsorption surface of the cutout material 4, 5a and 5b are permanent magnets, 6 is an iron core, 7 is a coil, and 8 is a yoke.
[0009]
(A) or (b) of FIG. 5 shows a configuration of a magnetic attraction means for adsorbing the N and S poles in contact with the attraction surface 4a. When the distance between the N pole and the S pole is narrowed, magnetic lines of force are emitted from the free magnetic poles of the N pole and S pole, resulting in loss of magnetic energy, and the magnetic flux passing through the inside of the cutout material 4 is reduced and the magnetic attractive force is reduced. The interval between the N pole and the S pole cannot be reduced. Therefore, the magnetic attraction means having such a configuration is not suitable when the area of the attraction surface 4a is small.
[0010]
(C) or (d) of FIG. 5 shows the configuration of the magnetic attraction means for adsorbing the attracting surface 4a by bringing the N pole or the S pole into contact therewith. The magnetic attraction means having such a configuration is also suitable when the area of the attraction surface 4a is small. For example, even when the area of the adsorption surface 4a is about 20 mm 2 , adsorption is possible.
[0011]
FIG. 6 is an explanatory view showing a process of taking out the cutout material 4 from the workpiece base material 3, and has a configuration in which the N pole or the S pole is brought into contact and adsorbed as shown in (c) or (d) of FIG. The case where the electromagnet 2b or the permanent magnet 5b which is a magnetic attraction means is used is shown. G schematically shows the direction of the lines of magnetic force.
[0012]
Since the cutout material 4 is a magnetic body, the cutout material 4 becomes a primary magnet and the direction of the lines of magnetic force is as shown in FIG. 6 in a state where it is attracted by the N pole of the electromagnet 2b or the permanent magnet 5b as shown in FIG. Accordingly, a magnetic attractive force is generated between the cutout material 4 and the workpiece base material 3.
[0013]
In the cutting material take-out device of the conventional wire electric discharge machine having such a configuration, the magnetic attraction force between the cutting material 4 and the workpiece base material 3 and the weight of the cutting material 4 are added, and the force is used as the electromagnet 2b. Or if it becomes larger than the magnetic attractive force between the permanent magnet 5b and the cutting material 4, the cutting material 4 will detach | leave from the electromagnet 2b or the permanent magnet 5b, and the extraction of the cutting material 4 will fail. Further, particularly when the workpiece is thick and the weight of the cutting material is heavy, the cutting material 4 and the workpiece base material are removed in the process of removing the cutting material 4 from the workpiece base material 3 as shown in FIG. 3 (A in the figure) does not become uniform over the entire circumference, so a moment (for example, the X axis in the figure) is generated in the cutout material 4 by the magnetic attractive force between the cutout material 4 and the workpiece base material 3. There is a problem that the reliability of taking out of the cutout material 4 is lowered, for example, the moment is increased and the moment is increased and the cutout material 4 is dropped.
[0014]
The present invention has been made in order to solve the above-described problems, and is applicable to a wire electric discharge machine that can be applied to a case where a cutting material adsorption area is small and can achieve high reliability of cutting material removal. It aims at obtaining the cutting material taking-out apparatus.
[0015]
[Means for Solving the Problems]
The cutting material take-out device of the wire electric discharge machine according to the present invention is the cutting material take-out device of the wire electric discharge machine that takes out the cutting material cut out from the workpiece by wire electric discharge machining by magnetic attraction force. Magnetic adsorption means for adsorbing the N pole or S pole in contact with the adsorption surface, at least one auxiliary electromagnet, relative positioning of the magnetic adsorption means and the workpiece, and adsorption by the magnetic adsorption means Drive means for taking out the cutout material, linear drive means for changing the relative position of the auxiliary electromagnet to the magnetic adsorption means, and the auxiliary electromagnet in the vicinity of the cutout material when the cutout material is attracted by the magnetic adsorption means The magnetic attraction means is configured so that the direction of the magnetic flux of the magnetic adsorption means and the direction of the magnetic flux of the auxiliary electromagnet are matched. Between the first control for exciting the auxiliary electromagnet so that the magnetic flux between the step and the cutout material increases, and from the predetermined intermediate state of taking out the cutout material from the workpiece to the completion of removal The auxiliary electromagnet is disposed in the vicinity of the workpiece, and the direction of the magnetic flux around the magnetic attraction means and the cutout material is reversed and the direction of the magnetic flux of the auxiliary electromagnet is reversed between the cutout material and the workpiece. And a control means for performing a second control for exciting the auxiliary electromagnet so that the magnetic flux decreases.
[0016]
In the cutout material takeout device for a wire electric discharge machine according to the present invention, the magnetic adsorption means is an electromagnet or a permanent magnet.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a configuration diagram of a cutout material take-out device for a wire electric discharge machine according to Embodiment 1 of the present invention, in which 1 is a magnet holder, 3 is a workpiece base material, and 4 is wire electric discharge machining. A cutout material 4a cut out from the workpiece base material 3, 4a is an attracting surface of the cutout material 4, 9 is an auxiliary electromagnet, 9a is a coil, 9b is a yoke, and 10 is a lower nozzle for guiding a wire electrode (not shown). 2b and 5b are the same as (c) and (d) of FIG. 5 of the prior art, that is, 2b is an electromagnet used as a magnetic attraction means configured to adsorb by contacting the N or S poles. Is a permanent magnet used as a magnetic attraction means configured to adsorb by contacting the N pole or the S pole. In the configuration of FIG. 1, an electromagnet 2b or a permanent magnet 5b is used as the magnetic attraction means.
[0018]
The magnet holder 1 is driven by driving means constituted by actuators such as air cylinders and servo motors (not shown), transmission mechanisms such as ball screws and spline shafts, linear guides, and the like, and electromagnets 2b or permanent magnets 5b as magnetic attraction means. And the workpiece base material 3 can be relatively positioned and the adsorbed cutout material 4 can be taken out.
[0019]
The auxiliary electromagnet 9 is disposed in the vicinity of the attracting surface 4a so as to cover the periphery of the electromagnet 2b or the permanent magnet 5b when the cutout material 4 is attracted as shown in FIG. From the middle of taking out from the base material 3 to the time when the take-out is completed as shown in FIG. 1B, it is arranged in the vicinity of the workpiece base material 3 so as to cover the periphery of the cutout material 4.
[0020]
In this way, the auxiliary electromagnet 9 is, for example, an air (not shown) so that the relative position between the auxiliary electromagnet 9 and the electromagnet 2b or permanent magnet 5b as magnetic attraction means can be changed in the direction of taking out the cutout material 4 (B direction in the figure). The electromagnet 2b or the permanent magnet 5b, which is a magnetic attraction means, is driven by a linear driving means constituted by a cylinder and a linear guide, or a ball screw, a servo motor and a linear guide.
[0021]
Further, predetermined control such as drive control of the drive means and linear drive means and excitation of the electromagnet 2b and the auxiliary electromagnet 9 is performed by control means (not shown).
[0022]
Next, the operation will be described. FIG. 2 is an operation explanatory view of the cutout material take-out device for the wire electric discharge machine according to Embodiment 1 of the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts. In FIG. 2, A is a gap between the cutout material 4 and the workpiece base material 3, G1 is a magnetic field line by the electromagnet 2b or the permanent magnet 5b, G2 is a magnetic field line by the auxiliary electromagnet 9 when the cutout material 4 is attracted, and G3 is the electromagnet 2b or Lines of magnetic force around the permanent magnet 5b and the cutout material 4, G4 shows lines of magnetic force generated by the auxiliary electromagnet 9 just before the cutout material 4 is taken out from the workpiece base material 3, and the direction of the lines of magnetic force is schematically shown.
[0023]
FIG. 2A shows a state immediately before the cutout material 4 is attracted by the electromagnet 2b or the permanent magnet 5b in order to take out the cutout material 4 from the workpiece base material 3. FIG. The electromagnet 2b or permanent magnet 5b and the auxiliary electromagnet 9 are arranged in the vicinity of the cutout material 4, and the direction of magnetic flux (magnetic line G1) by the electromagnet 2b or permanent magnet 5b and the direction of magnetic flux by the auxiliary electromagnet 9 (magnetic line G2) are set. Energize the electromagnet to match (so that the magnetic flux increases). By doing so, the magnetic attractive force acting on the cutout material 4 increases, for example, several times as much as that in the case of only the electromagnet 2b or the permanent magnet 5b, and as shown in FIG. Even when the cutout material 4 is dropped, the cutout material 4 can be more reliably attracted by the magnetic attraction force.
[0024]
FIG. 2B shows a state just before the extraction of the cutout material 4 from the workpiece base material 3 is completed. Since the relative position of the auxiliary electromagnet 9 and the magnet holder 1 and the electromagnet 2b or the permanent magnet 5b can be changed by the linear drive means, a predetermined intermediate state in which the cutout material 4 is removed from the workpiece base material 3 The auxiliary electromagnet 9 is arranged in the vicinity of the workpiece base material 3 until the removal is completed. The direction of the magnetic flux around the electromagnet 2b or the permanent magnet 5b and the cutting material 4 (magnetic line G3) and the magnetic flux generated by the auxiliary electromagnet 9 from the predetermined intermediate state of the cutting material 4 taken out from the workpiece base material 3 to the completion of the extraction. The auxiliary electromagnet 9 is excited so that the direction (magnetic line G4) is reversed (so that the magnetic flux decreases). By doing so, it is possible to suppress the magnetic attractive force acting on the gap (A in FIG. 2B) between the cutout material 4, the cutout material 4, and the workpiece base material 3. Accordingly, it is possible to reduce the moment that is related to the dropping of the cutout material 4 as described in FIG. 6 which is a problem to be solved by the invention. Further, since the magnetic attraction force acting on the gap between the cutout material 4 and the workpiece base material 3 is suppressed, even if the weight of the cutout material 4 is added to this magnetic attraction force, the cutout with the electromagnet 2b or the permanent magnet 5b is performed. It does not become larger than the magnetic attractive force acting between the material 4. Therefore, the cutout material 4 can be reliably taken out from the workpiece base material 3.
[0025]
As described above, excitation of the auxiliary electromagnet 9 is started so that the direction of the magnetic flux around the electromagnet 2b or the permanent magnet 5b and the cutout material 4 (magnetic line G3) and the direction of the magnetic flux by the auxiliary electromagnet 9 (magnetic line G4) are reversed. As for the predetermined intermediate state position of taking out the cutting material 4 from the workpiece base material 3, the optimum position differs depending on the plate thickness of the workpiece base material 3, the diameter of the wire electrode, the processing shape, etc. It can be obtained in advance by an experiment to take out the material 4. Alternatively, a predetermined position (for example, about 1/5 to 1/10 of the plate thickness of the workpiece base material 3) before the extraction of the cutout material 4 from the workpiece base material 3 is set as the predetermined intermediate state position. Good. Thus, before the cutout material 4 is extracted from the workpiece base material 3, the direction of the magnetic flux around the electromagnet 2b or permanent magnet 5b and the cutout material 4 (magnetic line G3) and the direction of the magnetic flux by the auxiliary electromagnet 9 (magnetic line G4). ), The auxiliary electromagnet 9 is excited so that the cutting material can be taken out with high reliability.
[0026]
In this way, the cutout material 4 reliably taken out from the workpiece base material 3 is conveyed to the upper part of a cutout material stocker (not shown) by the driving means. In this state, when using the electromagnet 2b as the magnetic attraction means, the exciting current of the electromagnet 2b is turned off and the cutout material 4 is dropped into the cutout material stocker. Further, when the permanent magnet 5b is used as the magnetic attraction means, the auxiliary electromagnet 9 is moved to the vicinity of the permanent magnet 5b by the linear drive means, and the magnetic flux in the direction opposite to the direction of the magnetic flux of the permanent magnet 5b is generated. When the electromagnet 9 is excited, the magnetic attractive force acting on the cutout material 4 is reduced to the weight of the cutout material 4 or less, and the cutout material 4 is dropped into the cutout material stocker. In this case, the direction, time, and maximum value of the current passed through the auxiliary electromagnet 9 are controlled by the control means so that the permanent magnet 5b is not demagnetized.
[0027]
As described above, the magnetic attractive force acting on the cutout material 4 is increased at the time of adsorption, and when the end of the cutout material 4 comes out of the workpiece base material 3, the cutout material 4 is interposed between the cutout material 4 and the workpiece base material 3. Since the working magnetic attraction force is reduced, it is possible to eliminate the inability to adsorb the cutout material 4 or the dropout of the cutout material 4 during extraction. Therefore, it is possible to increase the reliability of taking out the cutout material 4 from the workpiece base material 3. For example, even when the area of the suction surface 4a of the cutout material 4 is as small as about 20 mm 2 and the length of the cutout material 4 (the thickness of the workpiece base material 3) is as long as about 50 mm, the work piece of the cutout material 4 Removal from the base material 3 can be performed reliably.
[0028]
In the above, when the permanent magnet 5b is used as the magnetic attraction means, there is an effect that the cutout material 4 can be prevented from dropping at the time of a power failure.
[0029]
Moreover, although the case where the electromagnet 2b or the permanent magnet 5b is used as the magnetic attraction means has been described above, a primary magnet other than an electromagnet such as magnetized electromagnetic soft iron may be used as the magnetic attraction means.
[0030]
Embodiment 2. FIG.
FIG. 3 is a configuration diagram of a cutout material takeout device for a wire electric discharge machine according to Embodiment 2 of the present invention. The same reference numerals as those in FIG. 1 of Embodiment 1 denote the same or corresponding parts. In FIG. 3, 11 is a second auxiliary electromagnet, 11a is a coil, 11b is a yoke, and a permanent magnet 5b is used as magnetic attraction means.
[0031]
The operation of the auxiliary electromagnet 9 is the same as that in FIG. 2 of the first embodiment. The second auxiliary electromagnet 11 is arranged in the vicinity of the permanent magnet 5b and the auxiliary electromagnet 9 when the cutout material 4 is attracted as shown in FIG. 3A, and the direction of the magnetic flux by the permanent magnet 5b and the auxiliary electromagnet 9 are used. Excitation is performed so that the magnetic flux further increases in addition to the direction of the magnetic flux. By doing so, the magnetic attractive force acting on the cutout material 4 is further increased, and even when the weight of the cutout material 4 is heavier, the cutout material 4 can be more reliably adsorbed. The reliability of taking out the material 4 is further improved.
[0032]
When the second auxiliary electromagnet 11 is used in this way, the relative position between the second auxiliary electromagnet 11 and the permanent magnet 5b is fixed as shown in FIGS. After the cutout material 4 is taken out, the cutout material 4 is conveyed to the upper part of the cutout material stocker, and the second auxiliary electromagnet 11 is excited so as to generate a magnetic flux in a direction opposite to the magnetic flux direction of the permanent magnet 5b. It can be dropped into the stocker.
[0033]
Further, the relative position between the second auxiliary electromagnet 11 and the permanent magnet 5b may be made variable so that it can be moved in the same manner as the auxiliary electromagnet 9.
[0034]
In the above, the case where two auxiliary electromagnets 9 and second auxiliary electromagnets 11 are used as auxiliary electromagnets has been described. However, the number of auxiliary electromagnets is not limited to two, and three or more auxiliary electromagnets are used. May be used.
[0035]
【The invention's effect】
Since the cutout material take-out device of the wire electric discharge machine according to the present invention is configured as described above, the cutout material can be applied to a case where the cutout material adsorption area is small or the cutout material is heavy. There is an effect that it is possible to increase the reliability of the removal.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a cutout material takeout device for a wire electric discharge machine according to Embodiment 1 of the present invention;
FIG. 2 is an operation explanatory view of a cutout material takeout device for a wire electric discharge machine according to Embodiment 1 of the present invention;
FIG. 3 is a configuration diagram of a cutout material takeout device for a wire electric discharge machine according to Embodiment 2 of the present invention;
FIG. 4 is a configuration diagram around an electromagnet that adsorbs a cutout material in a cutout material takeout device of a conventional wire electric discharge machine.
FIG. 5 is an explanatory view showing a configuration example of an electromagnet and a permanent magnet used as magnetic attraction means.
FIG. 6 is an explanatory view showing a process of taking out the cut-out material from the workpiece base material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Magnet holder, 2b Electromagnet, 3 Workpiece base material, 4 Cutout material, 4a Adsorption surface, 5b Permanent magnet, 9 Auxiliary electromagnet, 9a Coil, 9b Yoke, 10 lower nozzle, G1, G2, G3, G4 Magnetic field lines.

Claims (2)

ワイヤ放電加工により被加工物から切り抜いた切り抜き材を磁気吸引力により吸着して取り出すワイヤ放電加工機の切り抜き材取り出し装置において、
前記切り抜き材の吸着面にＮ極又はＳ極を接触させて吸着する磁気吸着手段と、
少なくとも１個の補助電磁石と、
前記磁気吸着手段と前記被加工物との相対位置決め及び前記磁気吸着手段により吸着した前記切り抜き材の取り出しを行う駆動手段と、
前記補助電磁石の前記磁気吸着手段に対する相対位置を可変とする直線駆動手段と、
前記切り抜き材の前記磁気吸着手段による吸着時に前記補助電磁石を前記切り抜き材の近傍に配置し、前記磁気吸着手段の磁束の方向と前記補助電磁石の磁束の方向とを合わせて前記磁気吸着手段と前記切り抜き材との間の磁束が増加するように前記補助電磁石を励磁する第１の制御と、前記切り抜き材の前記被加工物からの取り出しの所定の中間状態から取り出し完了までの間に前記補助電磁石を前記被加工物近傍に配置し、前記磁気吸着手段及び前記切り抜き材周りの磁束の方向と前記補助電磁石の磁束の方向とを逆にして前記切り抜き材と前記被加工物との間の磁束が減少するように前記補助電磁石を励磁する第２の制御を行う制御手段とを備えたことを特徴とするワイヤ放電加工機の切り抜き材取り出し装置。In the cutting material take-out device of the wire electric discharge machine, the cutting material cut out from the workpiece by wire electric discharge machining is picked up by the magnetic attraction force.
Magnetic adsorption means for adsorbing the N pole or S pole in contact with the adsorption surface of the cutout material;
At least one auxiliary electromagnet;
Driving means for performing relative positioning between the magnetic adsorption means and the workpiece and taking out the cut-out material adsorbed by the magnetic adsorption means;
Linear drive means for varying the relative position of the auxiliary electromagnet with respect to the magnetic adsorption means;
The auxiliary electromagnet is disposed in the vicinity of the cutout material when the cutout material is attracted by the magnetic attraction means, and the magnetic attraction means and the magnetic flux at the auxiliary electromagnet are aligned with the magnetic attraction means and the auxiliary electromagnet. A first control for exciting the auxiliary electromagnet so as to increase a magnetic flux between the cutout material and the auxiliary electromagnet between a predetermined intermediate state of taking out the cutout material from the workpiece and completion of the removal. Is disposed in the vicinity of the workpiece, and the magnetic flux between the cutting material and the workpiece is reversed by reversing the direction of the magnetic flux around the magnetic attraction means and the cutting material and the direction of the magnetic flux of the auxiliary electromagnet. And a control means for performing second control for exciting the auxiliary electromagnet so as to decrease. 前記磁気吸着手段が電磁石又は永久磁石であることを特徴とする請求項１記載のワイヤ放電加工機の切り抜き材取り出し装置。2. The apparatus for taking out a cut material from a wire electric discharge machine according to claim 1, wherein the magnetic adsorption means is an electromagnet or a permanent magnet.
JP2000292101A 2000-09-26 2000-09-26 Cutout material takeout device for wire electric discharge machine Expired - Fee Related JP4126861B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019119844B4 (en) 2018-08-07 2024-08-29 Sodick Co., Ltd. CORE MOVEMENT DEVICE OF A WIRE SPARK EDM MACHINE

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6599532B1 (en) * 2018-10-12 2019-10-30 株式会社ソディック Core mover for wire cut electric discharge machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019119844B4 (en) 2018-08-07 2024-08-29 Sodick Co., Ltd. CORE MOVEMENT DEVICE OF A WIRE SPARK EDM MACHINE

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