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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://zzcxm.cn 点击:

对于线(xian)切(qie)割(ge)工件(jian)(jian)余(yu)(yu)留(liu)部(bu)(bu)位切(qie)割(ge)的(de)多(duo)次(ci)加(jia)(jia)工,首先必须解决被(bei)加(jia)(jia)工工件(jian)(jian)的(de)导(dao)电(dian)问(wen)题,因(yin)为在(zai)高精(jing)度线(xian)切(qie)割(ge)加(jia)(jia)工中,线(xian)电(dian)极的(de)行走(zou)路线(xian)可能需要(yao)沿加(jia)(jia)工轨(gui)迹往复行走(zou)多(duo)次(ci),才能保(bao)证被(bei)加(jia)(jia)工工件(jian)(jian)具(ju)有较高表(biao)面(mian)粗糙度和(he)表(biao)面(mian)精(jing)度,这时(shi)线(xian)切(qie)割(ge)加(jia)(jia)工是(shi)靠工件(jian)(jian)余(yu)(yu)留(liu)部(bu)(bu)位起到导(dao)电(dian)作(zuo)用(yong)以(yi)保(bao)障电(dian)加(jia)(jia)工正常进(jin)行。但在(zai)进(jin)行工件(jian)(jian)余(yu)(yu)留(liu)部(bu)(bu)位的(de)切(qie)割(ge)加(jia)(jia)工时(shi),若第一次(ci)切(qie)割(ge)即切(qie)下(xia)工件(jian)(jian)余(yu)(yu)留(liu)部(bu)(bu)位,将会导(dao)致(zhi)被(bei)切(qie)割(ge)部(bu)(bu)分(fen)与母(mu)(mu)体分(fen)离,以(yi)致(zhi)导(dao)电(dian)回(hui)路中断,无法进(jin)行继续(xu)(xu)加(jia)(jia)工,所以(yi)从线(xian)切(qie)割(ge)加(jia)(jia)工的(de)条件(jian)(jian)性和(he)延续(xu)(xu)性考虑(lv),必须使工件(jian)(jian)余(yu)(yu)留(liu)部(bu)(bu)位即便在(zai)多(duo)次(ci)切(qie)割(ge)的(de)情况下(xia)也能保(bao)持(chi)与母(mu)(mu)体之间正常导(dao)电(dian)的(de)要(yao)求。

为了实现上述目的,操(cao)作工(gong)人(ren)力图营(ying)造(zao)人(ren)为环境和(he)条件来满足(zu)导(dao)电(dian)要求,即当工(gong)作人(ren)员(yuan)在操(cao)作电(dian)火(huo)花(hua)线切(qie)割(ge)(ge)(ge)机(ji)遇到切(qie)割(ge)(ge)(ge)工(gong)件余留部位时(shi),可采用(yong)在被切(qie)割(ge)(ge)(ge)部分(fen)和(he)母体之间粘(zhan)铜片(pian)(pian)和(he)在切(qie)割(ge)(ge)(ge)间隙中塞铜片(pian)(pian)的处理方法(fa)来造(zao)成(cheng)人(ren)为的定位条件和(he)导(dao)电(dian)条件,使是(shi)火(huo)花(hua)加工(gong)得以继(ji)续进行,其具(ju)体做法(fa)与技巧(qiao)如下:

(1)在被(bei)切割(ge)部分(fen)与母体(ti)材料之(zhi)间(jian)粘贴连(lian)接(jie)铜片。其目(mu)的是使工件(jian)(jian)余留部分(fen)在切割(ge)时与母体(ti)材料相连(lian)固(gu)定,保证线切割(ge)有良好的定位条件(jian)(jian),从而保障(zhang)工件(jian)(jian)有优(you)异的加工质量,这(zhei)可依照以下(xia)步(bu)骤进行:

①首先(xian)根据加工工件的(de)大小(xiao)把薄铜片(厚度根据线电极情况(kuang)和加工部位形状而(er)定)剪成长条(tiao)形,然后折叠,井保证折叠部分一(yi)长一(yi)短。

②然后(hou)把(ba)铜片折叠(die)的弯(wan)曲部(bu)分用小手锤锤平,并用什锦锉(cuo)修理成楔(xie)形;

③再把经以上处理的(de)铜片塞到线电(dian)极(ji)加工所(suo)形(xing)成(cheng)的(de)缝隙(xi)里,同时在(zai)工件该部分的(de)表面滴上502胶水(即环氧(yang)树(shu)脂瞬时快干胶)。

由于切(qie)(qie)割(ge)时,电火花线(xian)切(qie)(qie)割(ge)机冲水使(shi)工(gong)件所(suo)受压力(li)较大,若(ruo)单纯用铜(tong)片塞紧来(lai)保证导电和固定(ding),容易(yi)产生以下(xia)问题:(a)铜(tong)片塞得(de)太(tai)松,担(dan)(dan)心固定(ding)不(bu)(bu)可(ke)靠、导电不(bu)(bu)稳定(ding);(b)铜(tong)片塞得(de)太(tai)紧,又担(dan)(dan)心损伤工(gong)件表面(mian)、破坏形位公(gong)差,所(suo)以采用502胶水来(lai)保证被切(qie)(qie)割(ge)部分与母体材料固定(ding);

④在将(jiang)铜(tong)片(pian)塞(sai)进加(jia)工部位(wei)时,应(ying)注意是:用502胶水(shui)粘(zhan)贴连(lian)接(jie)铜(tong)片(pian)时应(ying)远离工件(jian)(jian)余(yu)留部件(jian)(jian)处,以免502胶水(shui)渗到,造成绝(jue)缘。此外粘(zhan)贴连(lian)接(jie)铜(tong)片(pian)的位(wei)置应(ying)考(kao)虑(lv)对称分布,且应(ying)保证(zheng)同时塞(sai)紧,避免工件(jian)(jian)发(fa)生偏移,以致影响(xiang)工件(jian)(jian)加(jia)工质量。保证(zheng)被切割(ge)工件(jian)(jian)余(yu)留部位(wei)形(xing)状的正确性和精度的可(ke)靠性。

(2)在被切割部分与母体(ti)材料之(zhi)间填(tian)(tian)(tian)(tian)充(chong)(chong)(chong)导(dao)(dao)电(dian)铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)。把经折(zhe)叠、剪齐、锤平和修锉的(de)(de)薄铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)填(tian)(tian)(tian)(tian)充(chong)(chong)(chong)在线电(dian)极加(jia)工形(xing)成的(de)(de)缝隙里,并(bing)(bing)使铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)和缝隙壁紧密贴(tie)(tie)合。填(tian)(tian)(tian)(tian)充(chong)(chong)(chong)此铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)的(de)(de)目的(de)(de)是为了导(dao)(dao)电(dian),因为前面(mian)粘(zhan)贴(tie)(tie)连(lian)(lian)接(jie)铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)时用(yong)了502胶水(shui),而(er)(er)502胶水(shui)是不导(dao)(dao)电(dian)的(de)(de)。为了实现(xian)导(dao)(dao)电(dian)要求,故采用(yong)填(tian)(tian)(tian)(tian)充(chong)(chong)(chong)导(dao)(dao)电(dian)铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)的(de)(de)方法,填(tian)(tian)(tian)(tian)充(chong)(chong)(chong)导(dao)(dao)电(dian)铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)时同样应注意(yi)铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)的(de)(de)对(dui)称布置(zhi)以及铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)应同时加(jia)紧,并(bing)(bing)且不能塞得过紧以免划(hua)伤工件的(de)(de)表面(mian)。不管(guan)是粘(zhan)贴(tie)(tie)连(lian)(lian)接(jie)铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)还(hai)是填(tian)(tian)(tian)(tian)充(chong)(chong)(chong)导(dao)(dao)电(dian)铜(tong)(tong)(tong)(tong)(tong)缝隙的(de)(de)形(xing)状。都应该把小铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)制成圆弧形(xing),而(er)(er)且还(hai)应该用(yong)金相砂布打磨被锤过的(de)(de)铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)表面(mian),以保证铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)表面(mian)光滑以避免划(hua)伤工件已加(jia)工过的(de)(de)表面(mian)。

在(zai)采用电(dian)火花线切割机加工(gong)高硬度、高精(jing)度和高复杂度的(de)小型工(gong)件时,按照上述(shu)方法和步骤进行(xing)线切割加工(gong)中(zhong)工(gong)件余留部位的(de)精(jing)密切割,是一种(zhong)行(xing)之有效的(de)方法,它所提出(chu)的(de)步骤和技巧(qiao),经济简便、实用可行(xing),从而为(wei)改善和提高精(jing)密线切割加工(gong)的(de)质(zhi)量(liang)和效率探索出(chu)新的(de)途径。


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