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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://rxmgm.cn 点击:

对于(yu)线(xian)(xian)切(qie)割(ge)(ge)(ge)工(gong)(gong)(gong)件(jian)余(yu)留(liu)(liu)部(bu)(bu)位(wei)切(qie)割(ge)(ge)(ge)的(de)(de)(de)多(duo)(duo)次(ci)加(jia)(jia)工(gong)(gong)(gong),首(shou)先必须解(jie)决被加(jia)(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件(jian)的(de)(de)(de)导(dao)(dao)电(dian)(dian)问题,因为在高(gao)(gao)精(jing)度线(xian)(xian)切(qie)割(ge)(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)中,线(xian)(xian)电(dian)(dian)极(ji)的(de)(de)(de)行走路(lu)线(xian)(xian)可(ke)能(neng)需(xu)要(yao)(yao)沿(yan)加(jia)(jia)工(gong)(gong)(gong)轨迹(ji)往复行走多(duo)(duo)次(ci),才能(neng)保证被加(jia)(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件(jian)具有(you)较高(gao)(gao)表(biao)面(mian)粗糙度和表(biao)面(mian)精(jing)度,这(zhei)时(shi)线(xian)(xian)切(qie)割(ge)(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)是靠(kao)工(gong)(gong)(gong)件(jian)余(yu)留(liu)(liu)部(bu)(bu)位(wei)起到导(dao)(dao)电(dian)(dian)作用以(yi)(yi)保障电(dian)(dian)加(jia)(jia)工(gong)(gong)(gong)正常(chang)(chang)进行。但在进行工(gong)(gong)(gong)件(jian)余(yu)留(liu)(liu)部(bu)(bu)位(wei)的(de)(de)(de)切(qie)割(ge)(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)时(shi),若第一次(ci)切(qie)割(ge)(ge)(ge)即(ji)切(qie)下(xia)工(gong)(gong)(gong)件(jian)余(yu)留(liu)(liu)部(bu)(bu)位(wei),将会导(dao)(dao)致被切(qie)割(ge)(ge)(ge)部(bu)(bu)分(fen)(fen)与母体分(fen)(fen)离(li),以(yi)(yi)致导(dao)(dao)电(dian)(dian)回路(lu)中断,无法进行继续加(jia)(jia)工(gong)(gong)(gong),所以(yi)(yi)从线(xian)(xian)切(qie)割(ge)(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)的(de)(de)(de)条件(jian)性和延续性考(kao)虑,必须使(shi)工(gong)(gong)(gong)件(jian)余(yu)留(liu)(liu)部(bu)(bu)位(wei)即(ji)便在多(duo)(duo)次(ci)切(qie)割(ge)(ge)(ge)的(de)(de)(de)情况下(xia)也能(neng)保持与母体之间正常(chang)(chang)导(dao)(dao)电(dian)(dian)的(de)(de)(de)要(yao)(yao)求。

为(wei)了实(shi)现上述(shu)目的,操作(zuo)工人(ren)力图(tu)营造(zao)人(ren)为(wei)环境和条(tiao)件(jian)来满足导电(dian)要求,即当工作(zuo)人(ren)员(yuan)在操作(zuo)电(dian)火(huo)花线切割(ge)(ge)机(ji)遇到(dao)切割(ge)(ge)工件(jian)余(yu)留部位(wei)时(shi),可采用(yong)在被切割(ge)(ge)部分和母体(ti)之间粘铜(tong)片和在切割(ge)(ge)间隙(xi)中塞铜(tong)片的处(chu)理方法(fa)(fa)来造(zao)成人(ren)为(wei)的定(ding)位(wei)条(tiao)件(jian)和导电(dian)条(tiao)件(jian),使是火(huo)花加(jia)工得以继续进行,其具(ju)体(ti)做法(fa)(fa)与技(ji)巧如下(xia):

(1)在(zai)被切(qie)割部分与(yu)母体材料(liao)之间粘贴连接铜(tong)片。其目的(de)是使(shi)工件余留部分在(zai)切(qie)割时与(yu)母体材料(liao)相连固(gu)定,保(bao)证线切(qie)割有良好的(de)定位条件,从而保(bao)障(zhang)工件有优异(yi)的(de)加(jia)工质量,这可依照以下步骤进行:

①首先(xian)根据加工工件的大小把(ba)薄铜片(pian)(厚度根据线电极情况和(he)加工部位(wei)形状(zhuang)而定)剪(jian)成长条形,然后折叠(die),井保证折叠(die)部分一长一短。

②然后把铜片(pian)折叠的弯曲部分用(yong)小(xiao)手锤锤平,并用(yong)什锦锉修(xiu)理成楔形;

③再把经(jing)以(yi)上处(chu)理的(de)铜片塞到(dao)线电极加工所形成(cheng)的(de)缝隙(xi)里,同(tong)时在工件该部分的(de)表面滴上502胶(jiao)水(即环氧树脂瞬时快干胶(jiao))。

由于切割时,电(dian)火花线切割机冲水使(shi)工件所受压力(li)较(jiao)大,若单纯(chun)用(yong)铜(tong)(tong)(tong)片塞(sai)紧(jin)(jin)来保证导电(dian)和固(gu)定,容易产生以下问题:(a)铜(tong)(tong)(tong)片塞(sai)得太(tai)松,担(dan)心(xin)固(gu)定不可靠、导电(dian)不稳(wen)定;(b)铜(tong)(tong)(tong)片塞(sai)得太(tai)紧(jin)(jin),又担(dan)心(xin)损伤工件表面、破坏形位公差,所以采用(yong)502胶水来保证被切割部分与(yu)母(mu)体材料(liao)固(gu)定;

④在将铜(tong)(tong)片塞进加工(gong)(gong)部位(wei)时(shi),应注意是:用502胶水粘(zhan)贴连(lian)接铜(tong)(tong)片时(shi)应远离(li)工(gong)(gong)件(jian)余留部件(jian)处,以免502胶水渗到,造成绝缘。此外粘(zhan)贴连(lian)接铜(tong)(tong)片的位(wei)置(zhi)应考虑对称(cheng)分布,且应保(bao)证同时(shi)塞紧(jin),避免工(gong)(gong)件(jian)发生偏移,以致(zhi)影响工(gong)(gong)件(jian)加工(gong)(gong)质量。保(bao)证被切割工(gong)(gong)件(jian)余留部位(wei)形状(zhuang)的正确性和精(jing)度的可(ke)靠性。

(2)在(zai)被切割部分与母体材料之间填(tian)充(chong)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)。把经折叠、剪齐、锤(chui)平(ping)和(he)修锉的(de)(de)(de)薄铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)填(tian)充(chong)在(zai)线电(dian)(dian)(dian)(dian)(dian)极加(jia)工(gong)形(xing)(xing)(xing)成的(de)(de)(de)缝隙(xi)里,并(bing)(bing)使铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)和(he)缝隙(xi)壁紧密贴合。填(tian)充(chong)此铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)的(de)(de)(de)目的(de)(de)(de)是(shi)为(wei)了导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)(dian)(dian),因为(wei)前面粘贴连(lian)接铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)时用了502胶水,而502胶水是(shi)不(bu)(bu)(bu)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)。为(wei)了实现(xian)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)(dian)(dian)要求,故采用填(tian)充(chong)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)的(de)(de)(de)方(fang)法,填(tian)充(chong)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)时同样(yang)应(ying)注意铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)的(de)(de)(de)对称(cheng)布置以及铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)应(ying)同时加(jia)紧,并(bing)(bing)且不(bu)(bu)(bu)能塞得过紧以免划伤(shang)工(gong)件(jian)的(de)(de)(de)表面。不(bu)(bu)(bu)管是(shi)粘贴连(lian)接铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)还(hai)是(shi)填(tian)充(chong)导(dao)(dao)(dao)(dao)电(dian)(dian)(dian)(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)缝隙(xi)的(de)(de)(de)形(xing)(xing)(xing)状。都应(ying)该把小铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)制(zhi)成圆弧形(xing)(xing)(xing),而且还(hai)应(ying)该用金相砂布打磨被锤(chui)过的(de)(de)(de)铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)表面,以保(bao)证铜(tong)(tong)(tong)(tong)(tong)片(pian)(pian)表面光滑以避免划伤(shang)工(gong)件(jian)已加(jia)工(gong)过的(de)(de)(de)表面。

在(zai)采用电火花线(xian)切割(ge)机(ji)加工高(gao)硬度(du)、高(gao)精(jing)度(du)和高(gao)复(fu)杂度(du)的(de)小型工件时,按照上述方(fang)法(fa)和步骤进(jin)行(xing)线(xian)切割(ge)加工中工件余留部位的(de)精(jing)密切割(ge),是一种行(xing)之有效的(de)方(fang)法(fa),它所提出的(de)步骤和技巧,经济简便、实(shi)用可行(xing),从而为改善和提高(gao)精(jing)密线(xian)切割(ge)加工的(de)质量和效率探索出新的(de)途径。


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