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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://tg86.cn 点击:

对于线(xian)(xian)切(qie)割工(gong)(gong)(gong)(gong)件(jian)(jian)余留(liu)部(bu)位(wei)切(qie)割的(de)多次加(jia)(jia)工(gong)(gong)(gong)(gong),首(shou)先必(bi)须解决被(bei)加(jia)(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)(jian)的(de)导电(dian)(dian)问题,因为在高(gao)精度(du)线(xian)(xian)切(qie)割加(jia)(jia)工(gong)(gong)(gong)(gong)中,线(xian)(xian)电(dian)(dian)极的(de)行(xing)走(zou)路(lu)线(xian)(xian)可能(neng)需要(yao)沿加(jia)(jia)工(gong)(gong)(gong)(gong)轨迹往复(fu)行(xing)走(zou)多次,才(cai)能(neng)保(bao)证被(bei)加(jia)(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)(jian)具(ju)有(you)较高(gao)表面(mian)粗(cu)糙度(du)和(he)(he)表面(mian)精度(du),这时线(xian)(xian)切(qie)割加(jia)(jia)工(gong)(gong)(gong)(gong)是靠工(gong)(gong)(gong)(gong)件(jian)(jian)余留(liu)部(bu)位(wei)起到导电(dian)(dian)作用(yong)以(yi)保(bao)障(zhang)电(dian)(dian)加(jia)(jia)工(gong)(gong)(gong)(gong)正常进行(xing)。但(dan)在进行(xing)工(gong)(gong)(gong)(gong)件(jian)(jian)余留(liu)部(bu)位(wei)的(de)切(qie)割加(jia)(jia)工(gong)(gong)(gong)(gong)时,若第一(yi)次切(qie)割即(ji)切(qie)下工(gong)(gong)(gong)(gong)件(jian)(jian)余留(liu)部(bu)位(wei),将会(hui)导致(zhi)被(bei)切(qie)割部(bu)分与(yu)母体分离,以(yi)致(zhi)导电(dian)(dian)回路(lu)中断,无法进行(xing)继续(xu)加(jia)(jia)工(gong)(gong)(gong)(gong),所(suo)以(yi)从线(xian)(xian)切(qie)割加(jia)(jia)工(gong)(gong)(gong)(gong)的(de)条件(jian)(jian)性和(he)(he)延(yan)续(xu)性考虑,必(bi)须使工(gong)(gong)(gong)(gong)件(jian)(jian)余留(liu)部(bu)位(wei)即(ji)便在多次切(qie)割的(de)情况下也能(neng)保(bao)持(chi)与(yu)母体之间正常导电(dian)(dian)的(de)要(yao)求。

为(wei)了实现上述(shu)目的,操(cao)作工(gong)(gong)人(ren)力图(tu)营造人(ren)为(wei)环境(jing)和条件来满(man)足导电要(yao)求(qiu),即(ji)当(dang)工(gong)(gong)作人(ren)员在操(cao)作电火花(hua)线(xian)切割(ge)机(ji)遇到切割(ge)工(gong)(gong)件余留(liu)部位(wei)时,可采用在被切割(ge)部分和母(mu)体(ti)之(zhi)间(jian)粘铜片和在切割(ge)间(jian)隙中塞铜片的处(chu)理方法来造成人(ren)为(wei)的定位(wei)条件和导电条件,使是火花(hua)加(jia)工(gong)(gong)得以继续进行,其具体(ti)做法与技巧如下:

(1)在被切割部(bu)分(fen)与母(mu)体(ti)材(cai)(cai)料之(zhi)间粘贴连接铜(tong)片。其目(mu)的是使工(gong)件(jian)(jian)余留部(bu)分(fen)在切割时(shi)与母(mu)体(ti)材(cai)(cai)料相连固定(ding),保证线(xian)切割有良好的定(ding)位条件(jian)(jian),从而保障工(gong)件(jian)(jian)有优异的加工(gong)质量(liang),这可(ke)依照以(yi)下(xia)步骤进行(xing):

①首先(xian)根据加工工件的大小(xiao)把薄(bo)铜片(厚度根据线电极情况和加工部位(wei)形(xing)状而(er)定)剪成(cheng)长条形(xing),然后折叠(die),井(jing)保证折叠(die)部分一(yi)长一(yi)短。

②然后把铜(tong)片折叠的弯(wan)曲部分用(yong)小手锤锤平,并(bing)用(yong)什锦锉修理成楔形;

③再把经以上(shang)处理的铜片塞到(dao)线电(dian)极加工所形(xing)成(cheng)的缝隙里(li),同(tong)时在工件该部分的表面滴(di)上(shang)502胶(jiao)(jiao)水(即环氧(yang)树(shu)脂瞬时快干胶(jiao)(jiao))。

由于切(qie)(qie)割(ge)(ge)时,电火花(hua)线切(qie)(qie)割(ge)(ge)机冲水(shui)使工(gong)件(jian)所(suo)受压(ya)力较大,若(ruo)单纯用铜(tong)片(pian)塞(sai)紧来保证(zheng)导电和固(gu)定(ding),容易产生以(yi)下问题:(a)铜(tong)片(pian)塞(sai)得太松,担心(xin)固(gu)定(ding)不可靠(kao)、导电不稳定(ding);(b)铜(tong)片(pian)塞(sai)得太紧,又担心(xin)损伤工(gong)件(jian)表面、破(po)坏形位公(gong)差(cha),所(suo)以(yi)采用502胶(jiao)水(shui)来保证(zheng)被切(qie)(qie)割(ge)(ge)部分与母体材料固(gu)定(ding);

④在(zai)将铜(tong)片(pian)塞(sai)进加(jia)(jia)工(gong)部位(wei)时(shi),应(ying)注意是(shi):用(yong)502胶水(shui)粘(zhan)贴连接(jie)铜(tong)片(pian)时(shi)应(ying)远离工(gong)件余(yu)(yu)留部件处(chu),以(yi)(yi)免502胶水(shui)渗到,造成绝缘。此外粘(zhan)贴连接(jie)铜(tong)片(pian)的(de)位(wei)置应(ying)考虑对称分布,且应(ying)保证同(tong)时(shi)塞(sai)紧,避免工(gong)件发生偏移(yi),以(yi)(yi)致(zhi)影响工(gong)件加(jia)(jia)工(gong)质量(liang)。保证被切割工(gong)件余(yu)(yu)留部位(wei)形状的(de)正确性和精度的(de)可(ke)靠性。

(2)在(zai)被切割部分与母体(ti)材料之间(jian)填(tian)充(chong)(chong)(chong)(chong)导(dao)(dao)电(dian)铜(tong)片(pian)(pian)(pian)。把经(jing)折叠、剪齐、锤(chui)平和(he)修(xiu)锉的(de)薄铜(tong)片(pian)(pian)(pian)填(tian)充(chong)(chong)(chong)(chong)在(zai)线电(dian)极(ji)加工形(xing)成的(de)缝隙里,并使铜(tong)片(pian)(pian)(pian)和(he)缝隙壁(bi)紧密贴合。填(tian)充(chong)(chong)(chong)(chong)此铜(tong)片(pian)(pian)(pian)的(de)目的(de)是为了(le)(le)导(dao)(dao)电(dian),因(yin)为前(qian)面粘(zhan)贴连接铜(tong)片(pian)(pian)(pian)时用了(le)(le)502胶(jiao)水,而(er)502胶(jiao)水是不(bu)导(dao)(dao)电(dian)的(de)。为了(le)(le)实(shi)现导(dao)(dao)电(dian)要(yao)求,故采用填(tian)充(chong)(chong)(chong)(chong)导(dao)(dao)电(dian)铜(tong)片(pian)(pian)(pian)的(de)方(fang)法(fa),填(tian)充(chong)(chong)(chong)(chong)导(dao)(dao)电(dian)铜(tong)片(pian)(pian)(pian)时同样应(ying)(ying)注意铜(tong)片(pian)(pian)(pian)的(de)对(dui)称布(bu)置以(yi)及铜(tong)片(pian)(pian)(pian)应(ying)(ying)同时加紧,并且不(bu)能塞得过紧以(yi)免(mian)划(hua)伤(shang)工件的(de)表面。不(bu)管是粘(zhan)贴连接铜(tong)片(pian)(pian)(pian)还是填(tian)充(chong)(chong)(chong)(chong)导(dao)(dao)电(dian)铜(tong)缝隙的(de)形(xing)状。都应(ying)(ying)该(gai)把小铜(tong)片(pian)(pian)(pian)制成圆弧形(xing),而(er)且还应(ying)(ying)该(gai)用金相砂(sha)布(bu)打磨被锤(chui)过的(de)铜(tong)片(pian)(pian)(pian)表面,以(yi)保(bao)证铜(tong)片(pian)(pian)(pian)表面光滑以(yi)避免(mian)划(hua)伤(shang)工件已(yi)加工过的(de)表面。

在采用(yong)电火花线(xian)切(qie)割机加(jia)(jia)工(gong)(gong)高硬度、高精(jing)(jing)度和高复(fu)杂度的(de)(de)小型工(gong)(gong)件(jian)时,按照上述方法(fa)和步骤(zhou)进行(xing)(xing)线(xian)切(qie)割加(jia)(jia)工(gong)(gong)中(zhong)工(gong)(gong)件(jian)余(yu)留(liu)部位(wei)的(de)(de)精(jing)(jing)密(mi)切(qie)割,是一种行(xing)(xing)之有效的(de)(de)方法(fa),它所(suo)提(ti)出(chu)的(de)(de)步骤(zhou)和技(ji)巧,经济简便、实用(yong)可行(xing)(xing),从而为(wei)改善和提(ti)高精(jing)(jing)密(mi)线(xian)切(qie)割加(jia)(jia)工(gong)(gong)的(de)(de)质量和效率探(tan)索出(chu)新的(de)(de)途径。


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