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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://lamtech.com.cn 点击:

对(dui)于线切(qie)(qie)(qie)割(ge)工(gong)(gong)(gong)(gong)件(jian)(jian)余留部(bu)位切(qie)(qie)(qie)割(ge)的(de)(de)多(duo)次加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong),首先必须解决(jue)被加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)(jian)的(de)(de)导电(dian)(dian)问题,因为在高精(jing)(jing)度线切(qie)(qie)(qie)割(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)中(zhong),线电(dian)(dian)极的(de)(de)行(xing)(xing)走路(lu)线可能(neng)需要(yao)沿加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)轨迹往复(fu)行(xing)(xing)走多(duo)次,才能(neng)保证被加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)(jian)具有较高表面(mian)粗糙度和(he)表面(mian)精(jing)(jing)度,这时线切(qie)(qie)(qie)割(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)是靠工(gong)(gong)(gong)(gong)件(jian)(jian)余留部(bu)位起到导电(dian)(dian)作用以保障电(dian)(dian)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)正常进行(xing)(xing)。但在进行(xing)(xing)工(gong)(gong)(gong)(gong)件(jian)(jian)余留部(bu)位的(de)(de)切(qie)(qie)(qie)割(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)时,若第一次切(qie)(qie)(qie)割(ge)即(ji)切(qie)(qie)(qie)下工(gong)(gong)(gong)(gong)件(jian)(jian)余留部(bu)位,将会导致被切(qie)(qie)(qie)割(ge)部(bu)分与母(mu)(mu)体分离,以致导电(dian)(dian)回路(lu)中(zhong)断,无法进行(xing)(xing)继续(xu)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong),所以从线切(qie)(qie)(qie)割(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)的(de)(de)条件(jian)(jian)性(xing)和(he)延(yan)续(xu)性(xing)考虑,必须使(shi)工(gong)(gong)(gong)(gong)件(jian)(jian)余留部(bu)位即(ji)便在多(duo)次切(qie)(qie)(qie)割(ge)的(de)(de)情(qing)况下也能(neng)保持与母(mu)(mu)体之间正常导电(dian)(dian)的(de)(de)要(yao)求。

为了实现上(shang)述目(mu)的(de),操(cao)作(zuo)工人(ren)(ren)力图(tu)营造人(ren)(ren)为环境和(he)条(tiao)件来满(man)足导电要(yao)求,即当(dang)工作(zuo)人(ren)(ren)员在操(cao)作(zuo)电火花(hua)线切(qie)割(ge)(ge)(ge)机遇(yu)到切(qie)割(ge)(ge)(ge)工件余留部位时,可采(cai)用在被切(qie)割(ge)(ge)(ge)部分和(he)母体(ti)之间粘(zhan)铜片(pian)和(he)在切(qie)割(ge)(ge)(ge)间隙中塞铜片(pian)的(de)处理方法(fa)来造成人(ren)(ren)为的(de)定位条(tiao)件和(he)导电条(tiao)件,使是火花(hua)加工得(de)以继(ji)续进行,其具体(ti)做法(fa)与技巧(qiao)如下:

(1)在(zai)被切(qie)割部(bu)分与(yu)母体材料之间粘(zhan)贴(tie)连接铜(tong)片(pian)。其目的(de)是使工(gong)件(jian)余留部(bu)分在(zai)切(qie)割时与(yu)母体材料相连固定(ding),保证(zheng)线切(qie)割有良好的(de)定(ding)位(wei)条件(jian),从而保障工(gong)件(jian)有优(you)异的(de)加工(gong)质量,这可依照以下(xia)步骤进行:

①首先根(gen)据(ju)加工(gong)工(gong)件(jian)的大(da)小把薄铜(tong)片(厚度根(gen)据(ju)线电极情况和加工(gong)部(bu)位形(xing)状(zhuang)而定)剪成长(zhang)条形(xing),然(ran)后(hou)折(zhe)叠,井保(bao)证折(zhe)叠部(bu)分(fen)一(yi)长(zhang)一(yi)短。

②然(ran)后(hou)把铜片折(zhe)叠的(de)弯(wan)曲(qu)部分用小(xiao)手锤(chui)(chui)锤(chui)(chui)平,并用什锦(jin)锉(cuo)修理成(cheng)楔形(xing);

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

由于切(qie)(qie)割时,电火(huo)花(hua)线切(qie)(qie)割机冲水使(shi)工(gong)件所受压力较大,若(ruo)单纯用铜(tong)(tong)片塞(sai)紧(jin)来保证(zheng)导电和固(gu)定(ding),容易产(chan)生以下问题:(a)铜(tong)(tong)片塞(sai)得太(tai)松,担心(xin)固(gu)定(ding)不(bu)(bu)可(ke)靠、导电不(bu)(bu)稳定(ding);(b)铜(tong)(tong)片塞(sai)得太(tai)紧(jin),又(you)担心(xin)损伤工(gong)件表面、破坏形(xing)位(wei)公(gong)差,所以采用502胶(jiao)水来保证(zheng)被切(qie)(qie)割部分与(yu)母体材料固(gu)定(ding);

④在将铜(tong)(tong)片塞进加(jia)工部位(wei)时(shi),应(ying)注意是:用502胶水粘贴(tie)连(lian)接铜(tong)(tong)片时(shi)应(ying)远离工件(jian)余(yu)留部件(jian)处,以(yi)免(mian)502胶水渗(shen)到,造成(cheng)绝缘。此外粘贴(tie)连(lian)接铜(tong)(tong)片的(de)位(wei)置应(ying)考虑(lv)对称分布(bu),且(qie)应(ying)保(bao)证同(tong)时(shi)塞紧,避(bi)免(mian)工件(jian)发生偏移,以(yi)致(zhi)影响工件(jian)加(jia)工质量。保(bao)证被切割工件(jian)余(yu)留部位(wei)形状的(de)正确性(xing)和精度的(de)可靠性(xing)。

(2)在(zai)被切割部分与母体(ti)材料之(zhi)间填(tian)充(chong)导(dao)电(dian)(dian)铜(tong)片(pian)(pian)(pian)。把(ba)经折叠、剪齐(qi)、锤(chui)平和修锉的(de)(de)(de)薄铜(tong)片(pian)(pian)(pian)填(tian)充(chong)在(zai)线电(dian)(dian)极(ji)加(jia)工形成的(de)(de)(de)缝隙(xi)(xi)里,并使铜(tong)片(pian)(pian)(pian)和缝隙(xi)(xi)壁(bi)紧密贴(tie)合。填(tian)充(chong)此(ci)铜(tong)片(pian)(pian)(pian)的(de)(de)(de)目的(de)(de)(de)是(shi)为(wei)了导(dao)电(dian)(dian),因为(wei)前(qian)面(mian)(mian)粘(zhan)(zhan)贴(tie)连接铜(tong)片(pian)(pian)(pian)时(shi)用了502胶水,而502胶水是(shi)不导(dao)电(dian)(dian)的(de)(de)(de)。为(wei)了实(shi)现导(dao)电(dian)(dian)要求,故采用填(tian)充(chong)导(dao)电(dian)(dian)铜(tong)片(pian)(pian)(pian)的(de)(de)(de)方法,填(tian)充(chong)导(dao)电(dian)(dian)铜(tong)片(pian)(pian)(pian)时(shi)同样应(ying)注意铜(tong)片(pian)(pian)(pian)的(de)(de)(de)对称(cheng)布置以及铜(tong)片(pian)(pian)(pian)应(ying)同时(shi)加(jia)紧,并且不能塞得(de)过紧以免(mian)(mian)划(hua)伤工件的(de)(de)(de)表(biao)面(mian)(mian)。不管是(shi)粘(zhan)(zhan)贴(tie)连接铜(tong)片(pian)(pian)(pian)还是(shi)填(tian)充(chong)导(dao)电(dian)(dian)铜(tong)缝隙(xi)(xi)的(de)(de)(de)形状。都应(ying)该(gai)把(ba)小铜(tong)片(pian)(pian)(pian)制(zhi)成圆(yuan)弧形,而且还应(ying)该(gai)用金相(xiang)砂布打磨被锤(chui)过的(de)(de)(de)铜(tong)片(pian)(pian)(pian)表(biao)面(mian)(mian),以保(bao)证铜(tong)片(pian)(pian)(pian)表(biao)面(mian)(mian)光滑以避免(mian)(mian)划(hua)伤工件已加(jia)工过的(de)(de)(de)表(biao)面(mian)(mian)。

在采用电火花线切割机加(jia)(jia)工(gong)高(gao)(gao)硬度(du)、高(gao)(gao)精度(du)和(he)高(gao)(gao)复杂度(du)的(de)小型工(gong)件(jian)时,按(an)照上(shang)述方法和(he)步(bu)骤进(jin)行(xing)(xing)线切割加(jia)(jia)工(gong)中工(gong)件(jian)余留(liu)部(bu)位的(de)精密切割,是(shi)一种行(xing)(xing)之有效的(de)方法,它所(suo)提出的(de)步(bu)骤和(he)技巧,经济简便、实用可行(xing)(xing),从而为改善和(he)提高(gao)(gao)精密线切割加(jia)(jia)工(gong)的(de)质(zhi)量和(he)效率探索出新的(de)途(tu)径。


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