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中走丝处理方法

中走丝处理方法

发布日期:2016-04-21 00:00 来源:http://baidaijiaju.cn 点击:

对于线(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)工(gong)(gong)(gong)件(jian)余留(liu)(liu)部位(wei)(wei)切(qie)(qie)(qie)割(ge)的(de)(de)(de)(de)多(duo)次(ci)加(jia)(jia)(jia)工(gong)(gong)(gong),首先必须(xu)解决(jue)被(bei)(bei)加(jia)(jia)(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件(jian)的(de)(de)(de)(de)导(dao)(dao)电问(wen)题,因为在高精度线(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)加(jia)(jia)(jia)工(gong)(gong)(gong)中,线(xian)(xian)(xian)电极的(de)(de)(de)(de)行走(zou)(zou)路线(xian)(xian)(xian)可能需要(yao)沿加(jia)(jia)(jia)工(gong)(gong)(gong)轨迹往复行走(zou)(zou)多(duo)次(ci),才(cai)能保证被(bei)(bei)加(jia)(jia)(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件(jian)具有较(jiao)高表面粗(cu)糙度和表面精度,这时线(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)加(jia)(jia)(jia)工(gong)(gong)(gong)是靠工(gong)(gong)(gong)件(jian)余留(liu)(liu)部位(wei)(wei)起到导(dao)(dao)电作(zuo)用以保障电加(jia)(jia)(jia)工(gong)(gong)(gong)正(zheng)常(chang)(chang)进行。但在进行工(gong)(gong)(gong)件(jian)余留(liu)(liu)部位(wei)(wei)的(de)(de)(de)(de)切(qie)(qie)(qie)割(ge)加(jia)(jia)(jia)工(gong)(gong)(gong)时,若第一(yi)次(ci)切(qie)(qie)(qie)割(ge)即(ji)切(qie)(qie)(qie)下(xia)工(gong)(gong)(gong)件(jian)余留(liu)(liu)部位(wei)(wei),将会(hui)导(dao)(dao)致被(bei)(bei)切(qie)(qie)(qie)割(ge)部分(fen)与(yu)(yu)母体分(fen)离(li),以致导(dao)(dao)电回(hui)路中断,无法进行继续加(jia)(jia)(jia)工(gong)(gong)(gong),所以从(cong)线(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)加(jia)(jia)(jia)工(gong)(gong)(gong)的(de)(de)(de)(de)条件(jian)性(xing)和延续性(xing)考(kao)虑(lv),必须(xu)使(shi)工(gong)(gong)(gong)件(jian)余留(liu)(liu)部位(wei)(wei)即(ji)便在多(duo)次(ci)切(qie)(qie)(qie)割(ge)的(de)(de)(de)(de)情况(kuang)下(xia)也能保持(chi)与(yu)(yu)母体之间正(zheng)常(chang)(chang)导(dao)(dao)电的(de)(de)(de)(de)要(yao)求(qiu)。

为(wei)了实(shi)现上述目(mu)的,操(cao)作工人力(li)图营造人为(wei)环境和(he)条(tiao)(tiao)件来满(man)足导(dao)电要求,即当(dang)工作人员(yuan)在(zai)操(cao)作电火(huo)花(hua)线(xian)切(qie)(qie)割(ge)机遇(yu)到(dao)切(qie)(qie)割(ge)工件余留部位时,可采用在(zai)被(bei)切(qie)(qie)割(ge)部分和(he)母体(ti)之间粘铜(tong)片和(he)在(zai)切(qie)(qie)割(ge)间隙中塞(sai)铜(tong)片的处理方法来造成人为(wei)的定(ding)位条(tiao)(tiao)件和(he)导(dao)电条(tiao)(tiao)件,使是火(huo)花(hua)加工得以继(ji)续进行,其(qi)具体(ti)做法与技巧如下:

(1)在被切(qie)(qie)割部(bu)分(fen)与(yu)母体材(cai)料之(zhi)间粘(zhan)贴(tie)连接铜片。其目(mu)的是使工(gong)(gong)(gong)件(jian)余留部(bu)分(fen)在切(qie)(qie)割时与(yu)母体材(cai)料相(xiang)连固(gu)定(ding),保证线切(qie)(qie)割有(you)良好(hao)的定(ding)位(wei)条(tiao)件(jian),从而(er)保障工(gong)(gong)(gong)件(jian)有(you)优异的加工(gong)(gong)(gong)质量(liang),这可依照以下步骤(zhou)进(jin)行:

①首先根(gen)据加(jia)工工件的大小(xiao)把薄铜片(厚(hou)度根(gen)据线(xian)电极情(qing)况(kuang)和(he)加(jia)工部位(wei)形状而定)剪成(cheng)长(zhang)条(tiao)形,然后折叠,井保证折叠部分一长(zhang)一短(duan)。

②然后把(ba)铜片折叠的弯曲部分用小手锤(chui)锤(chui)平,并(bing)用什锦锉修理成楔(xie)形;

③再(zai)把经以上处理的铜片塞到线(xian)电极(ji)加(jia)工(gong)所形成的缝隙里,同时(shi)在工(gong)件该部分(fen)的表面(mian)滴上502胶水(即环氧树脂瞬(shun)时(shi)快干胶)。

由于切(qie)割时(shi),电火花线切(qie)割机冲水(shui)使工(gong)件(jian)所受压力较大,若单(dan)纯用铜(tong)片塞(sai)紧来保(bao)证(zheng)导电和固(gu)定(ding),容易(yi)产(chan)生以下(xia)问(wen)题:(a)铜(tong)片塞(sai)得(de)太松,担(dan)心(xin)固(gu)定(ding)不可靠、导电不稳定(ding);(b)铜(tong)片塞(sai)得(de)太紧,又(you)担(dan)心(xin)损(sun)伤工(gong)件(jian)表面(mian)、破(po)坏形位公差(cha),所以采(cai)用502胶(jiao)水(shui)来保(bao)证(zheng)被切(qie)割部分与(yu)母体材料固(gu)定(ding);

④在将铜片塞进加(jia)工部位时,应(ying)(ying)注意是(shi):用502胶水(shui)(shui)粘贴连接(jie)铜片时应(ying)(ying)远离工件余留部件处,以(yi)免502胶水(shui)(shui)渗到(dao),造成绝缘。此外(wai)粘贴连接(jie)铜片的位置应(ying)(ying)考(kao)虑(lv)对称分布,且应(ying)(ying)保证(zheng)同时塞紧,避免工件发(fa)生(sheng)偏(pian)移,以(yi)致影响(xiang)工件加(jia)工质(zhi)量。保证(zheng)被切割工件余留部位形(xing)状(zhuang)的正确性(xing)和精度的可靠(kao)性(xing)。

(2)在被切割部(bu)分(fen)与母体(ti)材料之间填(tian)充(chong)(chong)导(dao)电(dian)(dian)(dian)铜(tong)片(pian)(pian)(pian)(pian)。把(ba)(ba)经折(zhe)叠(die)、剪齐、锤平和(he)修锉的(de)(de)(de)(de)薄铜(tong)片(pian)(pian)(pian)(pian)填(tian)充(chong)(chong)在线电(dian)(dian)(dian)极(ji)加工(gong)(gong)形(xing)成的(de)(de)(de)(de)缝隙里,并(bing)使铜(tong)片(pian)(pian)(pian)(pian)和(he)缝隙壁紧密(mi)贴合。填(tian)充(chong)(chong)此(ci)铜(tong)片(pian)(pian)(pian)(pian)的(de)(de)(de)(de)目的(de)(de)(de)(de)是(shi)为了导(dao)电(dian)(dian)(dian),因(yin)为前面(mian)粘贴连接铜(tong)片(pian)(pian)(pian)(pian)时用(yong)了502胶(jiao)水,而(er)502胶(jiao)水是(shi)不(bu)导(dao)电(dian)(dian)(dian)的(de)(de)(de)(de)。为了实现(xian)导(dao)电(dian)(dian)(dian)要求,故采用(yong)填(tian)充(chong)(chong)导(dao)电(dian)(dian)(dian)铜(tong)片(pian)(pian)(pian)(pian)的(de)(de)(de)(de)方法,填(tian)充(chong)(chong)导(dao)电(dian)(dian)(dian)铜(tong)片(pian)(pian)(pian)(pian)时同样(yang)应注意铜(tong)片(pian)(pian)(pian)(pian)的(de)(de)(de)(de)对称(cheng)布(bu)置以(yi)(yi)及铜(tong)片(pian)(pian)(pian)(pian)应同时加紧,并(bing)且不(bu)能塞得过(guo)紧以(yi)(yi)免划伤工(gong)(gong)件的(de)(de)(de)(de)表面(mian)。不(bu)管是(shi)粘贴连接铜(tong)片(pian)(pian)(pian)(pian)还是(shi)填(tian)充(chong)(chong)导(dao)电(dian)(dian)(dian)铜(tong)缝隙的(de)(de)(de)(de)形(xing)状(zhuang)。都应该把(ba)(ba)小铜(tong)片(pian)(pian)(pian)(pian)制(zhi)成圆弧形(xing),而(er)且还应该用(yong)金相砂(sha)布(bu)打磨被锤过(guo)的(de)(de)(de)(de)铜(tong)片(pian)(pian)(pian)(pian)表面(mian),以(yi)(yi)保证铜(tong)片(pian)(pian)(pian)(pian)表面(mian)光滑以(yi)(yi)避免划伤工(gong)(gong)件已加工(gong)(gong)过(guo)的(de)(de)(de)(de)表面(mian)。

在采(cai)用(yong)电火花线切割(ge)机加工(gong)高(gao)硬度(du)、高(gao)精度(du)和(he)高(gao)复(fu)杂度(du)的小型工(gong)件(jian)时,按照(zhao)上述(shu)方(fang)(fang)法(fa)和(he)步骤进行线切割(ge)加工(gong)中工(gong)件(jian)余留部(bu)位的精密切割(ge),是一(yi)种(zhong)行之有效的方(fang)(fang)法(fa),它(ta)所提出(chu)(chu)的步骤和(he)技巧,经济简便、实用(yong)可(ke)行,从而为改善和(he)提高(gao)精密线切割(ge)加工(gong)的质量和(he)效率探索出(chu)(chu)新的途(tu)径。


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