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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://mjyj.com.cn 点击:

对于线(xian)(xian)切(qie)割(ge)(ge)工(gong)(gong)(gong)(gong)件(jian)余(yu)(yu)留(liu)部(bu)(bu)位(wei)切(qie)割(ge)(ge)的多次(ci)加(jia)工(gong)(gong)(gong)(gong),首先必(bi)(bi)须解决(jue)被加(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)的导(dao)(dao)电问题(ti),因(yin)为在(zai)高精度(du)线(xian)(xian)切(qie)割(ge)(ge)加(jia)工(gong)(gong)(gong)(gong)中,线(xian)(xian)电极(ji)的行(xing)走路(lu)线(xian)(xian)可能(neng)(neng)需(xu)要沿加(jia)工(gong)(gong)(gong)(gong)轨(gui)迹往复行(xing)走多次(ci),才(cai)能(neng)(neng)保证被加(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)具有较(jiao)高表面(mian)粗糙度(du)和(he)表面(mian)精度(du),这时线(xian)(xian)切(qie)割(ge)(ge)加(jia)工(gong)(gong)(gong)(gong)是靠工(gong)(gong)(gong)(gong)件(jian)余(yu)(yu)留(liu)部(bu)(bu)位(wei)起到导(dao)(dao)电作用(yong)以(yi)保障电加(jia)工(gong)(gong)(gong)(gong)正常进(jin)行(xing)。但(dan)在(zai)进(jin)行(xing)工(gong)(gong)(gong)(gong)件(jian)余(yu)(yu)留(liu)部(bu)(bu)位(wei)的切(qie)割(ge)(ge)加(jia)工(gong)(gong)(gong)(gong)时,若第一次(ci)切(qie)割(ge)(ge)即(ji)(ji)切(qie)下(xia)工(gong)(gong)(gong)(gong)件(jian)余(yu)(yu)留(liu)部(bu)(bu)位(wei),将(jiang)会导(dao)(dao)致被切(qie)割(ge)(ge)部(bu)(bu)分与母体分离,以(yi)致导(dao)(dao)电回路(lu)中断,无法(fa)进(jin)行(xing)继续(xu)加(jia)工(gong)(gong)(gong)(gong),所以(yi)从线(xian)(xian)切(qie)割(ge)(ge)加(jia)工(gong)(gong)(gong)(gong)的条(tiao)件(jian)性和(he)延(yan)续(xu)性考虑,必(bi)(bi)须使工(gong)(gong)(gong)(gong)件(jian)余(yu)(yu)留(liu)部(bu)(bu)位(wei)即(ji)(ji)便在(zai)多次(ci)切(qie)割(ge)(ge)的情况下(xia)也能(neng)(neng)保持(chi)与母体之间正常导(dao)(dao)电的要求。

为(wei)了实(shi)现上(shang)述目的(de),操作工(gong)(gong)人(ren)力图营造(zao)人(ren)为(wei)环境(jing)和条件(jian)来(lai)满(man)足导电要求(qiu),即当工(gong)(gong)作人(ren)员(yuan)在操作电火花线(xian)切割(ge)机遇到切割(ge)工(gong)(gong)件(jian)余留部(bu)位时(shi),可(ke)采用(yong)在被切割(ge)部(bu)分和母体(ti)之间(jian)粘铜片和在切割(ge)间(jian)隙中塞铜片的(de)处理方法来(lai)造(zao)成人(ren)为(wei)的(de)定位条件(jian)和导电条件(jian),使是火花加工(gong)(gong)得(de)以继续进行(xing),其具体(ti)做(zuo)法与(yu)技巧如下:

(1)在被切(qie)(qie)割(ge)部(bu)分(fen)与母(mu)体材料(liao)之(zhi)间粘贴连接铜(tong)片。其目的是使工件(jian)余(yu)留部(bu)分(fen)在切(qie)(qie)割(ge)时与母(mu)体材料(liao)相连固定,保证(zheng)线切(qie)(qie)割(ge)有良好的定位条件(jian),从而保障工件(jian)有优异的加工质量,这可依照以下步骤进行(xing):

①首先根据加工(gong)工(gong)件的大(da)小把薄铜片(厚度根据线电极情况和加工(gong)部(bu)位形(xing)状而定(ding))剪成长条形(xing),然(ran)后(hou)折叠,井(jing)保证折叠部(bu)分一(yi)长一(yi)短(duan)。

②然后把(ba)铜片(pian)折叠的(de)弯曲(qu)部分用小手锤锤平,并用什锦锉(cuo)修理成楔形;

③再把经以上(shang)处理的(de)铜片塞到线电极加工所(suo)形成的(de)缝隙(xi)里,同时(shi)在工件该(gai)部分的(de)表面滴上(shang)502胶(jiao)(jiao)水(即(ji)环氧树(shu)脂瞬时(shi)快干胶(jiao)(jiao))。

由于切(qie)割(ge)时,电火花线切(qie)割(ge)机冲水(shui)使工(gong)件所受压力(li)较(jiao)大,若单纯用铜(tong)片塞(sai)(sai)紧来保证导(dao)电和固(gu)定(ding),容易产生(sheng)以下问(wen)题:(a)铜(tong)片塞(sai)(sai)得太松(song),担心(xin)固(gu)定(ding)不可靠、导(dao)电不稳(wen)定(ding);(b)铜(tong)片塞(sai)(sai)得太紧,又担心(xin)损伤工(gong)件表面、破坏(huai)形(xing)位公差,所以采用502胶水(shui)来保证被切(qie)割(ge)部(bu)分与母体(ti)材料固(gu)定(ding);

④在将铜片塞(sai)进(jin)加工(gong)部(bu)(bu)位时(shi)(shi)(shi),应(ying)注意(yi)是:用502胶(jiao)水(shui)粘贴(tie)连接(jie)铜片时(shi)(shi)(shi)应(ying)远离(li)工(gong)件余(yu)留部(bu)(bu)件处,以(yi)免502胶(jiao)水(shui)渗到,造(zao)成绝缘。此(ci)外粘贴(tie)连接(jie)铜片的位置应(ying)考虑对称分布,且应(ying)保证同时(shi)(shi)(shi)塞(sai)紧,避免工(gong)件发生偏(pian)移(yi),以(yi)致影响工(gong)件加工(gong)质量。保证被切割工(gong)件余(yu)留部(bu)(bu)位形状的正确(que)性(xing)和(he)精(jing)度的可靠(kao)性(xing)。

(2)在被切割部分(fen)与母体(ti)材(cai)料之间填(tian)(tian)充(chong)(chong)导(dao)(dao)(dao)电(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)片。把(ba)经折叠、剪齐、锤平和(he)修锉的(de)(de)(de)薄(bo)铜(tong)(tong)(tong)(tong)(tong)片填(tian)(tian)充(chong)(chong)在线电(dian)(dian)极加(jia)工形(xing)(xing)(xing)成的(de)(de)(de)缝(feng)隙里,并使铜(tong)(tong)(tong)(tong)(tong)片和(he)缝(feng)隙壁紧密贴合。填(tian)(tian)充(chong)(chong)此铜(tong)(tong)(tong)(tong)(tong)片的(de)(de)(de)目的(de)(de)(de)是(shi)为了导(dao)(dao)(dao)电(dian)(dian),因为前面(mian)(mian)粘(zhan)贴连接铜(tong)(tong)(tong)(tong)(tong)片时用(yong)了502胶水,而(er)502胶水是(shi)不(bu)导(dao)(dao)(dao)电(dian)(dian)的(de)(de)(de)。为了实现(xian)导(dao)(dao)(dao)电(dian)(dian)要(yao)求,故(gu)采用(yong)填(tian)(tian)充(chong)(chong)导(dao)(dao)(dao)电(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)片的(de)(de)(de)方法,填(tian)(tian)充(chong)(chong)导(dao)(dao)(dao)电(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)片时同(tong)样应(ying)(ying)注意铜(tong)(tong)(tong)(tong)(tong)片的(de)(de)(de)对(dui)称布置以(yi)及铜(tong)(tong)(tong)(tong)(tong)片应(ying)(ying)同(tong)时加(jia)紧,并且(qie)(qie)不(bu)能塞得过(guo)(guo)紧以(yi)免划(hua)伤工件(jian)的(de)(de)(de)表(biao)(biao)面(mian)(mian)。不(bu)管是(shi)粘(zhan)贴连接铜(tong)(tong)(tong)(tong)(tong)片还(hai)是(shi)填(tian)(tian)充(chong)(chong)导(dao)(dao)(dao)电(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)缝(feng)隙的(de)(de)(de)形(xing)(xing)(xing)状。都应(ying)(ying)该把(ba)小铜(tong)(tong)(tong)(tong)(tong)片制(zhi)成圆弧形(xing)(xing)(xing),而(er)且(qie)(qie)还(hai)应(ying)(ying)该用(yong)金相砂布打磨(mo)被锤过(guo)(guo)的(de)(de)(de)铜(tong)(tong)(tong)(tong)(tong)片表(biao)(biao)面(mian)(mian),以(yi)保证铜(tong)(tong)(tong)(tong)(tong)片表(biao)(biao)面(mian)(mian)光滑以(yi)避免划(hua)伤工件(jian)已(yi)加(jia)工过(guo)(guo)的(de)(de)(de)表(biao)(biao)面(mian)(mian)。

在(zai)采(cai)用电(dian)火花线(xian)切(qie)割机加工(gong)高(gao)(gao)硬度(du)、高(gao)(gao)精(jing)度(du)和高(gao)(gao)复杂(za)度(du)的(de)小(xiao)型工(gong)件(jian)时,按照上(shang)述(shu)方法(fa)和步骤(zhou)进行(xing)线(xian)切(qie)割加工(gong)中工(gong)件(jian)余留部位的(de)精(jing)密切(qie)割,是一种行(xing)之有效的(de)方法(fa),它所提出的(de)步骤(zhou)和技(ji)巧,经济简便、实用可行(xing),从(cong)而为改善和提高(gao)(gao)精(jing)密线(xian)切(qie)割加工(gong)的(de)质(zhi)量和效率(lv)探索出新的(de)途(tu)径(jing)。


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