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中走丝处理方法

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中走丝处理方法

发布日期:2016-04-21 00:00 来源:http://high-fly.com.cn 点击:

对于线(xian)切(qie)割(ge)工(gong)件(jian)(jian)余留部(bu)位切(qie)割(ge)的多次加(jia)工(gong),首先必(bi)须(xu)解决被(bei)加(jia)工(gong)工(gong)件(jian)(jian)的导(dao)电(dian)(dian)问题,因为在(zai)高精度(du)(du)线(xian)切(qie)割(ge)加(jia)工(gong)中,线(xian)电(dian)(dian)极的行(xing)(xing)走路线(xian)可(ke)能需要沿(yan)加(jia)工(gong)轨迹(ji)往复行(xing)(xing)走多次,才(cai)能保证(zheng)被(bei)加(jia)工(gong)工(gong)件(jian)(jian)具有较高表(biao)面(mian)粗糙(cao)度(du)(du)和表(biao)面(mian)精度(du)(du),这(zhei)时线(xian)切(qie)割(ge)加(jia)工(gong)是靠工(gong)件(jian)(jian)余留部(bu)位起到导(dao)电(dian)(dian)作(zuo)用以保障(zhang)电(dian)(dian)加(jia)工(gong)正常进(jin)(jin)行(xing)(xing)。但在(zai)进(jin)(jin)行(xing)(xing)工(gong)件(jian)(jian)余留部(bu)位的切(qie)割(ge)加(jia)工(gong)时,若第一次切(qie)割(ge)即切(qie)下工(gong)件(jian)(jian)余留部(bu)位,将会导(dao)致(zhi)被(bei)切(qie)割(ge)部(bu)分与母体分离(li),以致(zhi)导(dao)电(dian)(dian)回(hui)路中断,无法进(jin)(jin)行(xing)(xing)继续加(jia)工(gong),所以从(cong)线(xian)切(qie)割(ge)加(jia)工(gong)的条件(jian)(jian)性和延续性考虑(lv),必(bi)须(xu)使工(gong)件(jian)(jian)余留部(bu)位即便(bian)在(zai)多次切(qie)割(ge)的情(qing)况下也能保持与母体之间(jian)正常导(dao)电(dian)(dian)的要求。

为(wei)(wei)了(le)实现上述目的,操作工(gong)人(ren)力图营造人(ren)为(wei)(wei)环(huan)境和条件(jian)来满足导(dao)电要求,即当工(gong)作人(ren)员在操作电火(huo)花线切(qie)割机(ji)遇到切(qie)割工(gong)件(jian)余留部位时(shi),可采(cai)用在被切(qie)割部分和母(mu)体之(zhi)间(jian)(jian)粘(zhan)铜(tong)片和在切(qie)割间(jian)(jian)隙中塞(sai)铜(tong)片的处(chu)理方(fang)法(fa)来造成(cheng)人(ren)为(wei)(wei)的定位条件(jian)和导(dao)电条件(jian),使是火(huo)花加工(gong)得(de)以继续进行,其具体做法(fa)与技巧(qiao)如下(xia):

(1)在被切割(ge)部分与母体材料(liao)之(zhi)间粘贴连接铜片。其(qi)目的是使工件(jian)(jian)余(yu)留(liu)部分在切割(ge)时(shi)与母体材料(liao)相连固定(ding),保证线切割(ge)有良好的定(ding)位(wei)条件(jian)(jian),从而保障工件(jian)(jian)有优异的加工质(zhi)量(liang),这可依(yi)照以下步骤(zhou)进行(xing):

①首先根据加(jia)工(gong)工(gong)件的大小把薄铜片(厚度根据线电极情况和加(jia)工(gong)部(bu)位形(xing)状而(er)定(ding))剪成(cheng)长条形(xing),然后折(zhe)叠,井保(bao)证折(zhe)叠部(bu)分一(yi)长一(yi)短。

②然(ran)后把铜片折叠(die)的弯曲(qu)部(bu)分用小手(shou)锤(chui)锤(chui)平,并用什锦锉修理成楔形;

③再把(ba)经以上处理的(de)(de)铜片塞到线电(dian)极加工所形(xing)成的(de)(de)缝隙(xi)里,同时(shi)在工件该部分的(de)(de)表面滴上502胶(jiao)水(即环氧树(shu)脂瞬时(shi)快干胶(jiao))。

由(you)于切(qie)割时,电(dian)火(huo)花线切(qie)割机冲水(shui)使(shi)工件(jian)所受压(ya)力较大(da),若单纯用(yong)铜(tong)片塞(sai)紧来保(bao)证导电(dian)和固定,容(rong)易产生以下问题:(a)铜(tong)片塞(sai)得太松,担心固定不可(ke)靠、导电(dian)不稳定;(b)铜(tong)片塞(sai)得太紧,又担心损伤(shang)工件(jian)表面、破坏形(xing)位公差,所以采用(yong)502胶水(shui)来保(bao)证被切(qie)割部分与母(mu)体(ti)材料(liao)固定;

④在将铜(tong)片塞(sai)进加(jia)工部位(wei)(wei)时(shi),应注意是:用502胶水粘(zhan)贴连接铜(tong)片时(shi)应远离工件(jian)余留部件(jian)处(chu),以免(mian)502胶水渗到,造成绝缘(yuan)。此外粘(zhan)贴连接铜(tong)片的(de)位(wei)(wei)置(zhi)应考(kao)虑(lv)对称分布,且应保(bao)证同(tong)时(shi)塞(sai)紧,避免(mian)工件(jian)发生偏移,以致影响工件(jian)加(jia)工质量。保(bao)证被(bei)切割工件(jian)余留部位(wei)(wei)形状的(de)正确性和(he)精度的(de)可靠性。

(2)在(zai)被(bei)切割部分与母体材料之间填充(chong)(chong)导(dao)电(dian)(dian)铜(tong)(tong)片(pian)(pian)(pian)。把经(jing)折叠(die)、剪齐、锤平和修锉的(de)(de)(de)(de)薄铜(tong)(tong)片(pian)(pian)(pian)填充(chong)(chong)在(zai)线电(dian)(dian)极加工(gong)形(xing)成的(de)(de)(de)(de)缝隙(xi)里,并使铜(tong)(tong)片(pian)(pian)(pian)和缝隙(xi)壁紧密贴(tie)合(he)。填充(chong)(chong)此铜(tong)(tong)片(pian)(pian)(pian)的(de)(de)(de)(de)目的(de)(de)(de)(de)是为了(le)导(dao)电(dian)(dian),因为前面(mian)粘贴(tie)连(lian)接(jie)铜(tong)(tong)片(pian)(pian)(pian)时用了(le)502胶水(shui),而502胶水(shui)是不(bu)(bu)导(dao)电(dian)(dian)的(de)(de)(de)(de)。为了(le)实现(xian)导(dao)电(dian)(dian)要求,故采(cai)用填充(chong)(chong)导(dao)电(dian)(dian)铜(tong)(tong)片(pian)(pian)(pian)的(de)(de)(de)(de)方法,填充(chong)(chong)导(dao)电(dian)(dian)铜(tong)(tong)片(pian)(pian)(pian)时同样应(ying)注意铜(tong)(tong)片(pian)(pian)(pian)的(de)(de)(de)(de)对称(cheng)布(bu)置以(yi)及铜(tong)(tong)片(pian)(pian)(pian)应(ying)同时加紧,并且不(bu)(bu)能塞得过紧以(yi)免划伤(shang)工(gong)件的(de)(de)(de)(de)表(biao)面(mian)。不(bu)(bu)管是粘贴(tie)连(lian)接(jie)铜(tong)(tong)片(pian)(pian)(pian)还是填充(chong)(chong)导(dao)电(dian)(dian)铜(tong)(tong)缝隙(xi)的(de)(de)(de)(de)形(xing)状(zhuang)。都应(ying)该(gai)(gai)把小铜(tong)(tong)片(pian)(pian)(pian)制成圆弧形(xing),而且还应(ying)该(gai)(gai)用金相砂布(bu)打磨被(bei)锤过的(de)(de)(de)(de)铜(tong)(tong)片(pian)(pian)(pian)表(biao)面(mian),以(yi)保证铜(tong)(tong)片(pian)(pian)(pian)表(biao)面(mian)光滑以(yi)避免划伤(shang)工(gong)件已加工(gong)过的(de)(de)(de)(de)表(biao)面(mian)。

在采用电(dian)火花线切(qie)割(ge)(ge)机加工(gong)(gong)高硬度(du)(du)、高精(jing)度(du)(du)和(he)高复杂度(du)(du)的小型工(gong)(gong)件(jian)(jian)时,按照上述方法和(he)步(bu)骤进行线切(qie)割(ge)(ge)加工(gong)(gong)中工(gong)(gong)件(jian)(jian)余留部位(wei)的精(jing)密(mi)切(qie)割(ge)(ge),是一种(zhong)行之有效(xiao)的方法,它所(suo)提出(chu)的步(bu)骤和(he)技巧,经济简(jian)便、实用可行,从而为改善和(he)提高精(jing)密(mi)线切(qie)割(ge)(ge)加工(gong)(gong)的质量(liang)和(he)效(xiao)率探索出(chu)新的途径(jing)。


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