行業資訊
管件端(duan)(duan)口的電(dian)(dian)磁校形(xing)(xing)可以(yi)分為由外(wai)向內(nei)縮徑(jing)校形(xing)(xing)和由內(nei)向外(wai)脹(zhang)形(xing)(xing)校形(xing)(xing)兩種方式。本(ben)文采用由內(nei)向外(wai)脹(zhang)形(xing)(xing)來校形(xing)(xing)，以(yi)此達到(dao)保證管件端(duan)(duan)口外(wai)表面圓(yuan)度符合要求的目(mu)的。鈦(tai)合金(jin)管件端(duan)(duan)口電(dian)(dian)磁校形(xing)(xing)原(yuan)理(li)示(shi)意圖(tu)如圖(tu)1所示(shi)。電(dian)(dian)磁校形(xing)(xing)開始(shi)時，高(gao)壓開關K閉合，儲能(neng)電(dian)(dian)容C對螺(luo)線管線圈(quan)釋(shi)放(fang)脈沖電(dian)(dian)流并在(zai)線圈(quan)周(zhou)圍形(xing)(xing)成一個強脈沖磁場B。
同(tong)時由于(yu)磁(ci)(ci)(ci)(ci)通(tong)量(liang)在臨(lin)近驅(qu)動(dong)片上的(de)迅速變化(hua)，驅(qu)動(dong)片產(chan)(chan)生(sheng)(sheng)與(yu)(yu)線(xian)圈(quan)電(dian)(dian)(dian)(dian)流方向相反的(de)感(gan)應電(dian)(dian)(dian)(dian)流J，并(bing)形(xing)成與(yu)(yu)原磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)B方向相反的(de)感(gan)應磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)B’，B’的(de)產(chan)(chan)生(sheng)(sheng)阻止了原始(shi)磁(ci)(ci)(ci)(ci)通(tong)穿過(guo)驅(qu)動(dong)片，迫使(shi)磁(ci)(ci)(ci)(ci)感(gan)應線(xian)在線(xian)圈(quan)與(yu)(yu)驅(qu)動(dong)片的(de)間(jian)隙(xi)內(nei)密(mi)集。于(yu)是，間(jian)隙(xi)內(nei)原磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)B與(yu)(yu)感(gan)應磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)B’的(de)軸向分量(liang)疊加，使(shi)驅(qu)動(dong)片受(shou)到(dao)(dao)軸向電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)力(li)(li)(li)(li)Pz。而疊加的(de)徑向分量(liang)則(ze)會產(chan)(chan)生(sheng)(sheng)徑向電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)力(li)(li)(li)(li)Pr，徑向電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)力(li)(li)(li)(li)Pr是電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)校形(xing)的(de)關鍵。驅(qu)動(dong)片受(shou)到(dao)(dao)巨大的(de)徑向電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)力(li)(li)(li)(li)，其(qi)隨即產(chan)(chan)生(sheng)(sheng)高速運動(dong)和變形(xing)并(bing)推動(dong)TC4管件與(yu)(yu)外模具(ju)貼合，完成校形(xing)的(de)全過(guo)程(cheng)。
通過有(you)限元(yuan)模(mo)擬與實(shi)驗相結合，得出(chu)小直徑線圈匝數以及鐵芯對電(dian)磁(ci)校(xiao)形的影響，對以后(hou)航空管件端(duan)口電(dian)磁(ci)校(xiao)形的發展具有(you)指導意義和實(shi)用價值。
實驗結果(guo)表明(ming)：1）線(xian)圈匝(za)(za)數增(zeng)(zeng)加(jia)(jia)(jia)，放電(dian)(dian)回(hui)路(lu)電(dian)(dian)流(liu)峰值顯著下降，震蕩(dang)頻率(lv)隨之減緩。選擇(ze)合理的(de)(de)(de)線(xian)圈匝(za)(za)數有(you)(you)利于提(ti)高成形(xing)(xing)(xing)效(xiao)(xiao)率(lv)，改善校形(xing)(xing)(xing)效(xiao)(xiao)果(guo)。2）隨著線(xian)圈匝(za)(za)數的(de)(de)(de)增(zeng)(zeng)多，大(da)徑向(xiang)電(dian)(dian)磁(ci)力降低，校形(xing)(xing)(xing)后(hou)的(de)(de)(de)大(da)變形(xing)(xing)(xing)量減少，同時徑向(xiang)電(dian)(dian)磁(ci)力作用范圍沿軸向(xiang)增(zeng)(zeng)加(jia)(jia)(jia)，管件端口變形(xing)(xing)(xing)更加(jia)(jia)(jia)均勻。3）鐵(tie)芯的(de)(de)(de)增(zeng)(zeng)加(jia)(jia)(jia)使線(xian)圈自感系數增(zeng)(zeng)大(da)，導(dao)致放電(dian)(dian)回(hui)路(lu)電(dian)(dian)流(liu)峰值下降，放電(dian)(dian)周期延長。在未達到(dao)鐵(tie)芯飽和磁(ci)通的(de)(de)(de)情況下，鐵(tie)芯的(de)(de)(de)增(zeng)(zeng)加(jia)(jia)(jia)提(ti)高了磁(ci)感應(ying)強度(du)及感應(ying)渦(wo)流(liu)密度(du)，進而增(zeng)(zeng)強驅動片(pian)所受電(dian)(dian)磁(ci)力，雖鐵(tie)芯本身有(you)(you)一定能量消耗，但總體(ti)上(shang)帶(dai)鐵(tie)芯線(xian)圈的(de)(de)(de)校形(xing)(xing)(xing)效(xiao)(xiao)果(guo)明(ming)顯優于無鐵(tie)芯情況。
