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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://33339999.cn 点击:

对(dui)于(yu)线切(qie)(qie)(qie)割(ge)(ge)工(gong)(gong)(gong)(gong)件(jian)余留(liu)部位(wei)(wei)切(qie)(qie)(qie)割(ge)(ge)的多次加工(gong)(gong)(gong)(gong),首先(xian)必须(xu)解决被(bei)(bei)加工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)的导电问题,因为在(zai)(zai)高(gao)精度(du)线切(qie)(qie)(qie)割(ge)(ge)加工(gong)(gong)(gong)(gong)中,线电极(ji)的行(xing)走路(lu)线可能需要(yao)沿(yan)加工(gong)(gong)(gong)(gong)轨迹(ji)往复行(xing)走多次,才能保(bao)证(zheng)被(bei)(bei)加工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)具有较高(gao)表(biao)面粗糙度(du)和表(biao)面精度(du),这(zhei)时线切(qie)(qie)(qie)割(ge)(ge)加工(gong)(gong)(gong)(gong)是靠工(gong)(gong)(gong)(gong)件(jian)余留(liu)部位(wei)(wei)起到导电作用以保(bao)障(zhang)电加工(gong)(gong)(gong)(gong)正常进(jin)(jin)行(xing)。但在(zai)(zai)进(jin)(jin)行(xing)工(gong)(gong)(gong)(gong)件(jian)余留(liu)部位(wei)(wei)的切(qie)(qie)(qie)割(ge)(ge)加工(gong)(gong)(gong)(gong)时,若第一次切(qie)(qie)(qie)割(ge)(ge)即切(qie)(qie)(qie)下工(gong)(gong)(gong)(gong)件(jian)余留(liu)部位(wei)(wei),将会导致(zhi)被(bei)(bei)切(qie)(qie)(qie)割(ge)(ge)部分与母体分离(li),以致(zhi)导电回(hui)路(lu)中断,无法进(jin)(jin)行(xing)继续加工(gong)(gong)(gong)(gong),所以从线切(qie)(qie)(qie)割(ge)(ge)加工(gong)(gong)(gong)(gong)的条(tiao)件(jian)性和延(yan)续性考虑(lv),必须(xu)使工(gong)(gong)(gong)(gong)件(jian)余留(liu)部位(wei)(wei)即便在(zai)(zai)多次切(qie)(qie)(qie)割(ge)(ge)的情况下也能保(bao)持与母体之(zhi)间正常导电的要(yao)求(qiu)。

为了实现上述目的,操作(zuo)工人(ren)力图(tu)营造人(ren)为环境和条(tiao)件(jian)来满足(zu)导电(dian)(dian)要求,即当(dang)工作(zuo)人(ren)员在操作(zuo)电(dian)(dian)火花线切(qie)割机遇到切(qie)割工件(jian)余留部位时(shi),可采(cai)用(yong)在被(bei)切(qie)割部分(fen)和母体之间(jian)粘铜片(pian)和在切(qie)割间(jian)隙(xi)中塞铜片(pian)的处理方法来造成人(ren)为的定位条(tiao)件(jian)和导电(dian)(dian)条(tiao)件(jian),使是火花加工得以(yi)继续进行,其具体做法与(yu)技(ji)巧如(ru)下(xia):

(1)在(zai)被切割(ge)部分与母体材料(liao)之间(jian)粘(zhan)贴连接(jie)铜片。其目(mu)的是使工件(jian)余留(liu)部分在(zai)切割(ge)时与母体材料(liao)相(xiang)连固(gu)定,保证(zheng)线切割(ge)有良好的定位条件(jian),从而保障工件(jian)有优异的加(jia)工质量,这可(ke)依照以(yi)下(xia)步骤进行:

①首先根(gen)据加(jia)工(gong)工(gong)件(jian)的(de)大(da)小把薄铜片(厚度根(gen)据线(xian)电极情(qing)况和加(jia)工(gong)部(bu)位形(xing)状而定)剪(jian)成(cheng)长(zhang)条形(xing),然后(hou)折叠,井(jing)保证折叠部(bu)分一长(zhang)一短。

②然后(hou)把铜片折叠的弯曲部(bu)分用(yong)小手(shou)锤(chui)锤(chui)平,并(bing)用(yong)什锦锉修理成楔形;

③再把经(jing)以上处理的(de)铜(tong)片塞到线电极加(jia)工(gong)所形成的(de)缝隙里,同时(shi)(shi)在(zai)工(gong)件(jian)该部分的(de)表(biao)面滴上502胶(jiao)水(即环氧树脂瞬时(shi)(shi)快干胶(jiao))。

由于切割(ge)时,电火花线(xian)切割(ge)机冲(chong)水使工件(jian)所受压(ya)力较大,若(ruo)单(dan)纯用(yong)铜片(pian)(pian)(pian)塞紧(jin)来(lai)保证(zheng)导电和固(gu)定(ding),容(rong)易产生(sheng)以(yi)下问(wen)题:(a)铜片(pian)(pian)(pian)塞得(de)太(tai)松,担心(xin)固(gu)定(ding)不可靠(kao)、导电不稳定(ding);(b)铜片(pian)(pian)(pian)塞得(de)太(tai)紧(jin),又担心(xin)损伤工件(jian)表面(mian)、破坏形位公(gong)差,所以(yi)采用(yong)502胶水来(lai)保证(zheng)被切割(ge)部分与(yu)母体材料固(gu)定(ding);

④在将铜(tong)片塞进(jin)加工(gong)部(bu)位(wei)时,应(ying)注(zhu)意是:用502胶水粘(zhan)(zhan)贴(tie)连(lian)接铜(tong)片时应(ying)远离工(gong)件余留(liu)部(bu)件处(chu),以(yi)免502胶水渗(shen)到,造成(cheng)绝缘(yuan)。此外粘(zhan)(zhan)贴(tie)连(lian)接铜(tong)片的(de)位(wei)置(zhi)应(ying)考虑对称分布,且应(ying)保(bao)证同时塞紧(jin),避免工(gong)件发生偏移,以(yi)致影响工(gong)件加工(gong)质量。保(bao)证被(bei)切割工(gong)件余留(liu)部(bu)位(wei)形状的(de)正确性和(he)精度的(de)可靠(kao)性。

(2)在被切割(ge)部分(fen)与母(mu)体(ti)材料之间填(tian)(tian)充(chong)(chong)导(dao)电铜(tong)片(pian)(pian)(pian)(pian)(pian)。把(ba)经折叠、剪齐(qi)、锤(chui)平和修(xiu)锉的(de)(de)(de)(de)(de)薄(bo)铜(tong)片(pian)(pian)(pian)(pian)(pian)填(tian)(tian)充(chong)(chong)在线(xian)电极加(jia)工形(xing)成的(de)(de)(de)(de)(de)缝(feng)隙(xi)里,并(bing)使铜(tong)片(pian)(pian)(pian)(pian)(pian)和缝(feng)隙(xi)壁紧密贴(tie)合(he)。填(tian)(tian)充(chong)(chong)此铜(tong)片(pian)(pian)(pian)(pian)(pian)的(de)(de)(de)(de)(de)目的(de)(de)(de)(de)(de)是为(wei)了导(dao)电,因为(wei)前面(mian)粘贴(tie)连(lian)接(jie)铜(tong)片(pian)(pian)(pian)(pian)(pian)时(shi)用(yong)(yong)(yong)了502胶(jiao)水,而502胶(jiao)水是不(bu)导(dao)电的(de)(de)(de)(de)(de)。为(wei)了实现导(dao)电要求,故(gu)采用(yong)(yong)(yong)填(tian)(tian)充(chong)(chong)导(dao)电铜(tong)片(pian)(pian)(pian)(pian)(pian)的(de)(de)(de)(de)(de)方(fang)法(fa),填(tian)(tian)充(chong)(chong)导(dao)电铜(tong)片(pian)(pian)(pian)(pian)(pian)时(shi)同样应注意铜(tong)片(pian)(pian)(pian)(pian)(pian)的(de)(de)(de)(de)(de)对称布置以及(ji)铜(tong)片(pian)(pian)(pian)(pian)(pian)应同时(shi)加(jia)紧,并(bing)且不(bu)能塞得过(guo)紧以免(mian)划伤(shang)(shang)工件的(de)(de)(de)(de)(de)表(biao)面(mian)。不(bu)管是粘贴(tie)连(lian)接(jie)铜(tong)片(pian)(pian)(pian)(pian)(pian)还(hai)是填(tian)(tian)充(chong)(chong)导(dao)电铜(tong)缝(feng)隙(xi)的(de)(de)(de)(de)(de)形(xing)状。都应该把(ba)小(xiao)铜(tong)片(pian)(pian)(pian)(pian)(pian)制成圆(yuan)弧形(xing),而且还(hai)应该用(yong)(yong)(yong)金相砂布打磨(mo)被锤(chui)过(guo)的(de)(de)(de)(de)(de)铜(tong)片(pian)(pian)(pian)(pian)(pian)表(biao)面(mian),以保证铜(tong)片(pian)(pian)(pian)(pian)(pian)表(biao)面(mian)光滑(hua)以避(bi)免(mian)划伤(shang)(shang)工件已加(jia)工过(guo)的(de)(de)(de)(de)(de)表(biao)面(mian)。

在采用(yong)(yong)电火花(hua)线(xian)切(qie)割(ge)机加(jia)(jia)工(gong)高硬度、高精度和高复杂度的(de)小型工(gong)件(jian)时,按照上述(shu)方(fang)法(fa)(fa)和步(bu)(bu)骤进行线(xian)切(qie)割(ge)加(jia)(jia)工(gong)中工(gong)件(jian)余(yu)留部位(wei)的(de)精密切(qie)割(ge),是一种行之(zhi)有效的(de)方(fang)法(fa)(fa),它所提(ti)出的(de)步(bu)(bu)骤和技巧,经济简便、实用(yong)(yong)可行,从而为(wei)改善(shan)和提(ti)高精密线(xian)切(qie)割(ge)加(jia)(jia)工(gong)的(de)质量和效率探(tan)索出新的(de)途径。


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