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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://lvzhouhai.cn 点击:

对于线(xian)切(qie)割(ge)(ge)工(gong)(gong)件(jian)(jian)(jian)(jian)余留(liu)(liu)部(bu)(bu)(bu)位(wei)切(qie)割(ge)(ge)的多次加(jia)(jia)(jia)工(gong)(gong),首先必须解(jie)决被加(jia)(jia)(jia)工(gong)(gong)工(gong)(gong)件(jian)(jian)(jian)(jian)的导(dao)电(dian)问(wen)题,因为在(zai)高(gao)精度线(xian)切(qie)割(ge)(ge)加(jia)(jia)(jia)工(gong)(gong)中,线(xian)电(dian)极的行走路线(xian)可能需要(yao)(yao)沿加(jia)(jia)(jia)工(gong)(gong)轨迹往复行走多次,才能保(bao)证被加(jia)(jia)(jia)工(gong)(gong)工(gong)(gong)件(jian)(jian)(jian)(jian)具有较(jiao)高(gao)表(biao)面粗糙度和(he)表(biao)面精度,这时线(xian)切(qie)割(ge)(ge)加(jia)(jia)(jia)工(gong)(gong)是靠工(gong)(gong)件(jian)(jian)(jian)(jian)余留(liu)(liu)部(bu)(bu)(bu)位(wei)起(qi)到导(dao)电(dian)作用以保(bao)障电(dian)加(jia)(jia)(jia)工(gong)(gong)正常(chang)进行。但在(zai)进行工(gong)(gong)件(jian)(jian)(jian)(jian)余留(liu)(liu)部(bu)(bu)(bu)位(wei)的切(qie)割(ge)(ge)加(jia)(jia)(jia)工(gong)(gong)时,若(ruo)第一次切(qie)割(ge)(ge)即切(qie)下工(gong)(gong)件(jian)(jian)(jian)(jian)余留(liu)(liu)部(bu)(bu)(bu)位(wei),将会(hui)导(dao)致被切(qie)割(ge)(ge)部(bu)(bu)(bu)分与(yu)母体分离(li),以致导(dao)电(dian)回路中断,无法(fa)进行继续加(jia)(jia)(jia)工(gong)(gong),所以从线(xian)切(qie)割(ge)(ge)加(jia)(jia)(jia)工(gong)(gong)的条(tiao)件(jian)(jian)(jian)(jian)性(xing)和(he)延续性(xing)考虑,必须使工(gong)(gong)件(jian)(jian)(jian)(jian)余留(liu)(liu)部(bu)(bu)(bu)位(wei)即便在(zai)多次切(qie)割(ge)(ge)的情况下也能保(bao)持与(yu)母体之间正常(chang)导(dao)电(dian)的要(yao)(yao)求。

为了实现上述目的,操(cao)(cao)作工人(ren)力图营造人(ren)为环境和条件来满足导电要求,即当工作人(ren)员在(zai)操(cao)(cao)作电火(huo)花(hua)线切(qie)割(ge)机遇到切(qie)割(ge)工件余留(liu)部(bu)位时,可采用在(zai)被切(qie)割(ge)部(bu)分(fen)和母体(ti)之间(jian)粘铜(tong)片(pian)(pian)和在(zai)切(qie)割(ge)间(jian)隙(xi)中塞(sai)铜(tong)片(pian)(pian)的处理方法来造成人(ren)为的定位条件和导电条件,使是火(huo)花(hua)加工得以继续进行(xing),其具体(ti)做法与技巧如下:

(1)在(zai)被切割(ge)部分(fen)(fen)与(yu)母体材(cai)料之(zhi)间粘贴连(lian)接铜片(pian)。其目(mu)的是使工件余留部分(fen)(fen)在(zai)切割(ge)时与(yu)母体材(cai)料相连(lian)固定(ding),保证线切割(ge)有良好的定(ding)位条件,从(cong)而保障工件有优异(yi)的加工质量,这可依(yi)照以下步骤进行:

①首先根(gen)据加(jia)工(gong)工(gong)件的大小把薄铜片(厚度根(gen)据线(xian)电极情况和加(jia)工(gong)部(bu)位(wei)形状而定)剪成长条形,然后折叠,井保证折叠部(bu)分一长一短。

②然后把(ba)铜片(pian)折叠(die)的弯曲部分用(yong)小手(shou)锤锤平,并(bing)用(yong)什锦锉修理成楔形(xing);

③再把经(jing)以上处理(li)的铜(tong)片塞到线电极加工所形成的缝隙里,同时(shi)在工件该(gai)部分的表面滴上502胶水(即环氧树脂瞬(shun)时(shi)快干(gan)胶)。

由于(yu)切割(ge)(ge)(ge)时,电(dian)(dian)火花线切割(ge)(ge)(ge)机(ji)冲水(shui)使工(gong)件所受压(ya)力较大,若单(dan)纯用铜片塞紧来保(bao)(bao)证(zheng)导电(dian)(dian)和固(gu)定,容易产生(sheng)以(yi)下问题:(a)铜片塞得(de)太(tai)松,担(dan)心固(gu)定不可靠(kao)、导电(dian)(dian)不稳定;(b)铜片塞得(de)太(tai)紧,又担(dan)心损伤(shang)工(gong)件表(biao)面、破坏(huai)形位公(gong)差,所以(yi)采用502胶水(shui)来保(bao)(bao)证(zheng)被切割(ge)(ge)(ge)部分(fen)与母体(ti)材料固(gu)定;

④在将铜(tong)片塞进加工部(bu)位(wei)时(shi),应注意是(shi):用(yong)502胶水粘贴(tie)连接铜(tong)片时(shi)应远离(li)工件余(yu)留部(bu)件处,以免(mian)502胶水渗到(dao),造成绝(jue)缘。此(ci)外粘贴(tie)连接铜(tong)片的(de)(de)位(wei)置应考虑对称分布,且应保证同(tong)时(shi)塞紧,避免(mian)工件发生偏移,以致(zhi)影响工件加工质量(liang)。保证被(bei)切割(ge)工件余(yu)留部(bu)位(wei)形状的(de)(de)正确性(xing)和精度的(de)(de)可靠性(xing)。

(2)在被切割部分与母体材料之(zhi)间填(tian)充(chong)(chong)导(dao)电(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)。把(ba)经折叠、剪齐、锤(chui)平和(he)修锉(cuo)的(de)(de)(de)(de)薄铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)填(tian)充(chong)(chong)在线(xian)电(dian)(dian)极加工(gong)形成(cheng)的(de)(de)(de)(de)缝隙(xi)(xi)里,并使(shi)铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)和(he)缝隙(xi)(xi)壁(bi)紧(jin)密贴合。填(tian)充(chong)(chong)此铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)的(de)(de)(de)(de)目(mu)的(de)(de)(de)(de)是(shi)为了(le)(le)导(dao)电(dian)(dian),因为前面(mian)粘贴连(lian)接铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)时(shi)用了(le)(le)502胶(jiao)水(shui),而502胶(jiao)水(shui)是(shi)不导(dao)电(dian)(dian)的(de)(de)(de)(de)。为了(le)(le)实现导(dao)电(dian)(dian)要求,故采用填(tian)充(chong)(chong)导(dao)电(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)的(de)(de)(de)(de)方法(fa),填(tian)充(chong)(chong)导(dao)电(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)时(shi)同样应(ying)(ying)注(zhu)意(yi)铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)的(de)(de)(de)(de)对称布置以(yi)(yi)及铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)应(ying)(ying)同时(shi)加紧(jin),并且不能塞(sai)得过(guo)(guo)紧(jin)以(yi)(yi)免(mian)划(hua)伤工(gong)件的(de)(de)(de)(de)表面(mian)。不管(guan)是(shi)粘贴连(lian)接铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)还是(shi)填(tian)充(chong)(chong)导(dao)电(dian)(dian)铜(tong)(tong)(tong)(tong)(tong)(tong)缝隙(xi)(xi)的(de)(de)(de)(de)形状。都(dou)应(ying)(ying)该(gai)把(ba)小铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)制成(cheng)圆弧形,而且还应(ying)(ying)该(gai)用金(jin)相(xiang)砂布打(da)磨被锤(chui)过(guo)(guo)的(de)(de)(de)(de)铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)表面(mian),以(yi)(yi)保证(zheng)铜(tong)(tong)(tong)(tong)(tong)(tong)片(pian)(pian)表面(mian)光滑以(yi)(yi)避免(mian)划(hua)伤工(gong)件已加工(gong)过(guo)(guo)的(de)(de)(de)(de)表面(mian)。

在采用电火(huo)花线切割(ge)机加(jia)工(gong)(gong)高(gao)硬度(du)、高(gao)精度(du)和高(gao)复(fu)杂度(du)的小(xiao)型工(gong)(gong)件时,按照上(shang)述方法和步骤(zhou)进行线切割(ge)加(jia)工(gong)(gong)中工(gong)(gong)件余(yu)留部位(wei)的精密切割(ge),是一种行之有效的方法,它(ta)所(suo)提(ti)出(chu)的步骤(zhou)和技巧,经济简(jian)便、实(shi)用可行,从而为改善(shan)和提(ti)高(gao)精密线切割(ge)加(jia)工(gong)(gong)的质量和效率探索(suo)出(chu)新的途径。


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