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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://meinaif.com.cn 点击:

对于线(xian)切(qie)(qie)(qie)割(ge)(ge)工(gong)(gong)(gong)件(jian)余(yu)(yu)留部位(wei)(wei)(wei)切(qie)(qie)(qie)割(ge)(ge)的(de)多次加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong),首(shou)先必须(xu)(xu)解决(jue)被(bei)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件(jian)的(de)导电问题,因(yin)为在高(gao)精度(du)线(xian)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)中(zhong),线(xian)电极的(de)行(xing)(xing)走路线(xian)可能(neng)需要沿加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)轨(gui)迹(ji)往复行(xing)(xing)走多次,才能(neng)保证被(bei)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件(jian)具有较高(gao)表(biao)面粗(cu)糙度(du)和表(biao)面精度(du),这时线(xian)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)是靠工(gong)(gong)(gong)件(jian)余(yu)(yu)留部位(wei)(wei)(wei)起到导电作用(yong)以(yi)保障(zhang)电加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)正(zheng)常进(jin)行(xing)(xing)。但(dan)在进(jin)行(xing)(xing)工(gong)(gong)(gong)件(jian)余(yu)(yu)留部位(wei)(wei)(wei)的(de)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)时,若第一次切(qie)(qie)(qie)割(ge)(ge)即(ji)切(qie)(qie)(qie)下工(gong)(gong)(gong)件(jian)余(yu)(yu)留部位(wei)(wei)(wei),将会导致(zhi)(zhi)被(bei)切(qie)(qie)(qie)割(ge)(ge)部分与母(mu)体分离,以(yi)致(zhi)(zhi)导电回路中(zhong)断,无法进(jin)行(xing)(xing)继续加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong),所(suo)以(yi)从(cong)线(xian)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)(jia)(jia)工(gong)(gong)(gong)的(de)条件(jian)性和延续性考虑,必须(xu)(xu)使工(gong)(gong)(gong)件(jian)余(yu)(yu)留部位(wei)(wei)(wei)即(ji)便在多次切(qie)(qie)(qie)割(ge)(ge)的(de)情况下也能(neng)保持与母(mu)体之间正(zheng)常导电的(de)要求。

为(wei)了实现上述目的(de),操作工人力图营造人为(wei)环境(jing)和条(tiao)件来(lai)满足导(dao)电要求,即当工作人员在(zai)操作电火花线(xian)切(qie)割(ge)机遇到(dao)切(qie)割(ge)工件余留部位时,可采用在(zai)被切(qie)割(ge)部分(fen)和母体(ti)之间(jian)粘铜(tong)片和在(zai)切(qie)割(ge)间(jian)隙中塞(sai)铜(tong)片的(de)处理方法来(lai)造成人为(wei)的(de)定位条(tiao)件和导(dao)电条(tiao)件,使是火花加工得(de)以(yi)继续进行,其(qi)具体(ti)做法与技巧如下:

(1)在被切割部分(fen)与(yu)(yu)母(mu)体材(cai)(cai)料(liao)之间(jian)粘贴连接铜片。其目的是使工(gong)件余(yu)留部分(fen)在切割时与(yu)(yu)母(mu)体材(cai)(cai)料(liao)相连固(gu)定(ding),保(bao)证线切割有良好(hao)的定(ding)位(wei)条件,从(cong)而保(bao)障工(gong)件有优异的加(jia)工(gong)质(zhi)量,这可依(yi)照(zhao)以下步骤进行:

①首(shou)先根据加工工件的大(da)小(xiao)把(ba)薄铜片(厚度根据线电极情况和加工部位(wei)形状而定(ding))剪成长条形,然后折叠(die),井保证(zheng)折叠(die)部分(fen)一长一短。

②然后(hou)把铜片(pian)折叠(die)的弯曲部(bu)分用(yong)小手锤锤平,并(bing)用(yong)什锦锉修理(li)成楔形;

③再把经以上处理的铜片(pian)塞到线电极加工所形成的缝隙里(li),同时(shi)在工件该部分的表面滴上502胶水(shui)(即(ji)环氧树脂瞬时(shi)快干胶)。

由于切(qie)割(ge)时,电火花(hua)线切(qie)割(ge)机冲水使(shi)工(gong)件所受压力较大,若单(dan)纯用铜(tong)片(pian)塞紧来保(bao)证导电和固定,容易产生(sheng)以下问(wen)题:(a)铜(tong)片(pian)塞得(de)太(tai)松(song),担(dan)心固定不可靠、导电不稳定;(b)铜(tong)片(pian)塞得(de)太(tai)紧,又担(dan)心损伤工(gong)件表面(mian)、破坏形位公差,所以采用502胶水来保(bao)证被切(qie)割(ge)部分与母体材料固定;

④在将铜(tong)片塞进(jin)加工部位(wei)时(shi),应注(zhu)意(yi)是:用502胶水(shui)粘(zhan)贴连接铜(tong)片时(shi)应远离(li)工件(jian)余留部件(jian)处,以免(mian)502胶水(shui)渗到(dao),造(zao)成(cheng)绝缘。此外粘(zhan)贴连接铜(tong)片的(de)位(wei)置应考(kao)虑对称分布,且(qie)应保(bao)证(zheng)同(tong)时(shi)塞紧,避免(mian)工件(jian)发生(sheng)偏移(yi),以致(zhi)影(ying)响工件(jian)加工质量。保(bao)证(zheng)被切割工件(jian)余留部位(wei)形状的(de)正确性(xing)和精度的(de)可靠性(xing)。

(2)在(zai)被(bei)切(qie)割部分与(yu)母体材料之间(jian)填(tian)充(chong)导(dao)(dao)电(dian)(dian)铜(tong)(tong)片(pian)(pian)。把经(jing)折(zhe)叠、剪齐、锤(chui)平和修锉的(de)(de)薄铜(tong)(tong)片(pian)(pian)填(tian)充(chong)在(zai)线(xian)电(dian)(dian)极(ji)加工(gong)形成的(de)(de)缝隙(xi)里,并使(shi)铜(tong)(tong)片(pian)(pian)和缝隙(xi)壁(bi)紧(jin)(jin)密贴(tie)合。填(tian)充(chong)此(ci)铜(tong)(tong)片(pian)(pian)的(de)(de)目的(de)(de)是(shi)为了导(dao)(dao)电(dian)(dian),因为前面(mian)粘(zhan)贴(tie)连接铜(tong)(tong)片(pian)(pian)时(shi)用(yong)了502胶水(shui)(shui),而502胶水(shui)(shui)是(shi)不(bu)导(dao)(dao)电(dian)(dian)的(de)(de)。为了实现导(dao)(dao)电(dian)(dian)要求,故采用(yong)填(tian)充(chong)导(dao)(dao)电(dian)(dian)铜(tong)(tong)片(pian)(pian)的(de)(de)方法(fa),填(tian)充(chong)导(dao)(dao)电(dian)(dian)铜(tong)(tong)片(pian)(pian)时(shi)同样应注意铜(tong)(tong)片(pian)(pian)的(de)(de)对称布置以(yi)及(ji)铜(tong)(tong)片(pian)(pian)应同时(shi)加紧(jin)(jin),并且(qie)不(bu)能塞得过紧(jin)(jin)以(yi)免(mian)划伤(shang)工(gong)件的(de)(de)表(biao)面(mian)。不(bu)管是(shi)粘(zhan)贴(tie)连接铜(tong)(tong)片(pian)(pian)还(hai)是(shi)填(tian)充(chong)导(dao)(dao)电(dian)(dian)铜(tong)(tong)缝隙(xi)的(de)(de)形状。都应该(gai)把小铜(tong)(tong)片(pian)(pian)制成圆弧形,而且(qie)还(hai)应该(gai)用(yong)金相砂布打磨被(bei)锤(chui)过的(de)(de)铜(tong)(tong)片(pian)(pian)表(biao)面(mian),以(yi)保证(zheng)铜(tong)(tong)片(pian)(pian)表(biao)面(mian)光滑以(yi)避(bi)免(mian)划伤(shang)工(gong)件已加工(gong)过的(de)(de)表(biao)面(mian)。

在采(cai)用电火花线(xian)切割(ge)机(ji)加工高(gao)(gao)硬度(du)、高(gao)(gao)精(jing)度(du)和高(gao)(gao)复杂(za)度(du)的(de)(de)小型工件时(shi),按照(zhao)上述方(fang)法和步(bu)骤(zhou)进行(xing)线(xian)切割(ge)加工中工件余留(liu)部位的(de)(de)精(jing)密切割(ge),是一(yi)种行(xing)之有效的(de)(de)方(fang)法,它所(suo)提(ti)(ti)出的(de)(de)步(bu)骤(zhou)和技巧(qiao),经济简(jian)便、实用可行(xing),从而为改善和提(ti)(ti)高(gao)(gao)精(jing)密线(xian)切割(ge)加工的(de)(de)质量和效率(lv)探索出新(xin)的(de)(de)途(tu)径(jing)。


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