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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://niushirt.cn 点击:

对于线(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)工(gong)(gong)件(jian)(jian)余留部位(wei)切(qie)(qie)(qie)割(ge)(ge)的(de)(de)(de)(de)多次加(jia)(jia)(jia)工(gong)(gong),首先必(bi)须解(jie)决被加(jia)(jia)(jia)工(gong)(gong)工(gong)(gong)件(jian)(jian)的(de)(de)(de)(de)导(dao)(dao)电(dian)(dian)(dian)问题,因为在(zai)(zai)高(gao)精度线(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)工(gong)(gong)中,线(xian)(xian)电(dian)(dian)(dian)极的(de)(de)(de)(de)行(xing)走(zou)(zou)路线(xian)(xian)可能需要沿加(jia)(jia)(jia)工(gong)(gong)轨迹往复行(xing)走(zou)(zou)多次,才能保(bao)证被加(jia)(jia)(jia)工(gong)(gong)工(gong)(gong)件(jian)(jian)具有较(jiao)高(gao)表面粗糙度和(he)表面精度,这时线(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)工(gong)(gong)是靠工(gong)(gong)件(jian)(jian)余留部位(wei)起到导(dao)(dao)电(dian)(dian)(dian)作(zuo)用(yong)以(yi)保(bao)障(zhang)电(dian)(dian)(dian)加(jia)(jia)(jia)工(gong)(gong)正(zheng)常进(jin)行(xing)。但在(zai)(zai)进(jin)行(xing)工(gong)(gong)件(jian)(jian)余留部位(wei)的(de)(de)(de)(de)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)工(gong)(gong)时,若第一次切(qie)(qie)(qie)割(ge)(ge)即切(qie)(qie)(qie)下(xia)工(gong)(gong)件(jian)(jian)余留部位(wei),将会导(dao)(dao)致被切(qie)(qie)(qie)割(ge)(ge)部分与(yu)母(mu)体(ti)分离,以(yi)致导(dao)(dao)电(dian)(dian)(dian)回路中断,无法(fa)进(jin)行(xing)继续(xu)加(jia)(jia)(jia)工(gong)(gong),所以(yi)从(cong)线(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)工(gong)(gong)的(de)(de)(de)(de)条件(jian)(jian)性(xing)和(he)延续(xu)性(xing)考虑,必(bi)须使工(gong)(gong)件(jian)(jian)余留部位(wei)即便在(zai)(zai)多次切(qie)(qie)(qie)割(ge)(ge)的(de)(de)(de)(de)情况(kuang)下(xia)也能保(bao)持与(yu)母(mu)体(ti)之(zhi)间正(zheng)常导(dao)(dao)电(dian)(dian)(dian)的(de)(de)(de)(de)要求(qiu)。

为(wei)了实现上述目的(de),操(cao)作(zuo)工(gong)人力图营(ying)造人为(wei)环(huan)境和(he)(he)条件(jian)来(lai)满足(zu)导电(dian)要求,即(ji)当工(gong)作(zuo)人员在操(cao)作(zuo)电(dian)火花线(xian)切割(ge)(ge)机遇到切割(ge)(ge)工(gong)件(jian)余留部位(wei)时,可采用在被切割(ge)(ge)部分和(he)(he)母(mu)体之间(jian)粘铜片(pian)和(he)(he)在切割(ge)(ge)间(jian)隙中塞铜片(pian)的(de)处理方法(fa)来(lai)造成人为(wei)的(de)定(ding)位(wei)条件(jian)和(he)(he)导电(dian)条件(jian),使是火花加工(gong)得以继续进行(xing),其具体做(zuo)法(fa)与技巧如下:

(1)在被切割部分(fen)与母体材(cai)料之间粘贴连接铜片。其目的(de)是使工件余留部分(fen)在切割时与母体材(cai)料相连固定,保证线(xian)切割有良好的(de)定位条件,从而保障工件有优异的(de)加(jia)工质量,这可依照(zhao)以下步(bu)骤进(jin)行:

①首先根(gen)据(ju)(ju)加工工件的大小(xiao)把薄铜片(厚(hou)度(du)根(gen)据(ju)(ju)线电(dian)极情况和加工部位形状而定)剪成长条形,然后(hou)折叠,井保证折叠部分(fen)一长一短。

②然后把铜片折(zhe)叠的弯曲(qu)部分用小手锤(chui)锤(chui)平,并用什(shen)锦锉修理成楔形;

③再把经以上(shang)处(chu)理的铜片塞到线电极(ji)加工(gong)所形成的缝(feng)隙(xi)里,同(tong)时在(zai)工(gong)件该(gai)部分的表面(mian)滴上(shang)502胶水(即环氧树脂瞬时快干(gan)胶)。

由于切割时,电(dian)火花(hua)线切割机(ji)冲水(shui)使(shi)工件所(suo)(suo)受压力较大,若单纯用(yong)铜(tong)片塞紧来保证导(dao)电(dian)和固定(ding),容易产生以下问题:(a)铜(tong)片塞得(de)太松,担心(xin)(xin)固定(ding)不(bu)(bu)可(ke)靠、导(dao)电(dian)不(bu)(bu)稳定(ding);(b)铜(tong)片塞得(de)太紧,又担心(xin)(xin)损(sun)伤(shang)工件表面、破(po)坏形位(wei)公(gong)差,所(suo)(suo)以采用(yong)502胶(jiao)水(shui)来保证被切割部分与母体材(cai)料固定(ding);

④在将铜片塞进(jin)加工部位(wei)时(shi),应注(zhu)意是:用502胶水(shui)粘贴连接铜片时(shi)应远离工件(jian)余留(liu)部件(jian)处,以免502胶水(shui)渗到,造成绝缘(yuan)。此外粘贴连接铜片的位(wei)置应考虑(lv)对称分布,且应保(bao)(bao)证(zheng)同时(shi)塞紧,避(bi)免工件(jian)发生偏移(yi),以致影响工件(jian)加工质量。保(bao)(bao)证(zheng)被切割工件(jian)余留(liu)部位(wei)形(xing)状的正确性和精(jing)度的可靠性。

(2)在被切割(ge)部分与母体材料之间填(tian)(tian)充(chong)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)铜片(pian)(pian)。把经(jing)折叠、剪齐、锤平和修锉的(de)(de)薄铜片(pian)(pian)填(tian)(tian)充(chong)在线(xian)电(dian)(dian)(dian)极加工(gong)(gong)形(xing)成的(de)(de)缝(feng)隙里,并使铜片(pian)(pian)和缝(feng)隙壁紧密贴(tie)合。填(tian)(tian)充(chong)此铜片(pian)(pian)的(de)(de)目的(de)(de)是(shi)为了(le)(le)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian),因为前(qian)面(mian)粘贴(tie)连接(jie)铜片(pian)(pian)时(shi)用了(le)(le)502胶水(shui),而502胶水(shui)是(shi)不(bu)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)的(de)(de)。为了(le)(le)实现导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)要求,故采用填(tian)(tian)充(chong)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)铜片(pian)(pian)的(de)(de)方法,填(tian)(tian)充(chong)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)铜片(pian)(pian)时(shi)同样应(ying)注意铜片(pian)(pian)的(de)(de)对称(cheng)布(bu)置以(yi)(yi)(yi)及铜片(pian)(pian)应(ying)同时(shi)加紧,并且不(bu)能塞得过(guo)紧以(yi)(yi)(yi)免划伤(shang)工(gong)(gong)件的(de)(de)表(biao)面(mian)。不(bu)管是(shi)粘贴(tie)连接(jie)铜片(pian)(pian)还(hai)是(shi)填(tian)(tian)充(chong)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)铜缝(feng)隙的(de)(de)形(xing)状。都应(ying)该(gai)把小铜片(pian)(pian)制成圆弧形(xing),而且还(hai)应(ying)该(gai)用金相砂布(bu)打磨被锤过(guo)的(de)(de)铜片(pian)(pian)表(biao)面(mian),以(yi)(yi)(yi)保证铜片(pian)(pian)表(biao)面(mian)光滑以(yi)(yi)(yi)避免划伤(shang)工(gong)(gong)件已加工(gong)(gong)过(guo)的(de)(de)表(biao)面(mian)。

在(zai)采用(yong)电火花线(xian)切(qie)(qie)割机加(jia)(jia)工高(gao)(gao)硬度、高(gao)(gao)精度和(he)(he)高(gao)(gao)复杂度的(de)(de)小型工件(jian)时,按照上述方法和(he)(he)步骤进行线(xian)切(qie)(qie)割加(jia)(jia)工中工件(jian)余(yu)留部位的(de)(de)精密(mi)切(qie)(qie)割,是(shi)一种(zhong)行之有效(xiao)的(de)(de)方法,它所提出的(de)(de)步骤和(he)(he)技(ji)巧,经(jing)济简便、实用(yong)可行,从而(er)为(wei)改善和(he)(he)提高(gao)(gao)精密(mi)线(xian)切(qie)(qie)割加(jia)(jia)工的(de)(de)质量和(he)(he)效(xiao)率探索出新的(de)(de)途径。


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