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中走丝处理方法

中走丝处理方法

发布日期:2016-04-21 00:00 来源:http://zktime.com.cn 点击:

对(dui)于线切(qie)割(ge)(ge)(ge)(ge)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)件余(yu)(yu)留(liu)(liu)(liu)部(bu)位(wei)切(qie)割(ge)(ge)(ge)(ge)的(de)多(duo)次(ci)(ci)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong),首(shou)先(xian)必(bi)须解决被加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)件的(de)导(dao)电问题,因为在(zai)高精度(du)线切(qie)割(ge)(ge)(ge)(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)中(zhong),线电极的(de)行走路线可能(neng)需(xu)要沿加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)轨(gui)迹往复行走多(duo)次(ci)(ci),才(cai)能(neng)保(bao)证(zheng)被加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)件具有较高表面粗(cu)糙度(du)和表面精度(du),这(zhei)时线切(qie)割(ge)(ge)(ge)(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)是(shi)靠工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)件余(yu)(yu)留(liu)(liu)(liu)部(bu)位(wei)起(qi)到导(dao)电作用以(yi)保(bao)障电加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)正(zheng)常进行。但在(zai)进行工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)件余(yu)(yu)留(liu)(liu)(liu)部(bu)位(wei)的(de)切(qie)割(ge)(ge)(ge)(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)时,若(ruo)第(di)一(yi)次(ci)(ci)切(qie)割(ge)(ge)(ge)(ge)即(ji)(ji)切(qie)下(xia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)件余(yu)(yu)留(liu)(liu)(liu)部(bu)位(wei),将会导(dao)致被切(qie)割(ge)(ge)(ge)(ge)部(bu)分与(yu)母体(ti)(ti)分离,以(yi)致导(dao)电回(hui)路中(zhong)断,无法进行继续加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong),所以(yi)从线切(qie)割(ge)(ge)(ge)(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)的(de)条件性和延(yan)续性考虑(lv),必(bi)须使(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)件余(yu)(yu)留(liu)(liu)(liu)部(bu)位(wei)即(ji)(ji)便在(zai)多(duo)次(ci)(ci)切(qie)割(ge)(ge)(ge)(ge)的(de)情况下(xia)也能(neng)保(bao)持与(yu)母体(ti)(ti)之间正(zheng)常导(dao)电的(de)要求。

为了实(shi)现上述目的,操作(zuo)工(gong)人(ren)力图营造(zao)人(ren)为环境和条(tiao)(tiao)件(jian)来满(man)足导电(dian)要求,即当工(gong)作(zuo)人(ren)员(yuan)在(zai)操作(zuo)电(dian)火花线切(qie)割(ge)机(ji)遇到切(qie)割(ge)工(gong)件(jian)余留部位时,可(ke)采用在(zai)被切(qie)割(ge)部分和母体之(zhi)间粘(zhan)铜片和在(zai)切(qie)割(ge)间隙(xi)中塞铜片的处理(li)方法(fa)来造(zao)成人(ren)为的定位条(tiao)(tiao)件(jian)和导电(dian)条(tiao)(tiao)件(jian),使是(shi)火花加工(gong)得以继续进(jin)行,其具体做法(fa)与(yu)技巧(qiao)如下:

(1)在(zai)被切割部分与母体(ti)(ti)材料之间粘贴连接铜片(pian)。其目的(de)是使工件余留部分在(zai)切割时与母体(ti)(ti)材料相连固(gu)定(ding),保证(zheng)线切割有良(liang)好(hao)的(de)定(ding)位(wei)条件,从而保障工件有优异的(de)加工质(zhi)量,这可依(yi)照以下步(bu)骤进行:

①首先(xian)根据加(jia)工(gong)工(gong)件的大小把薄铜片(厚度根据线电极情况和加(jia)工(gong)部位形状而定(ding))剪成长条形,然(ran)后折(zhe)叠,井保证折(zhe)叠部分(fen)一长一短。

②然(ran)后(hou)把铜片折(zhe)叠的弯曲(qu)部分(fen)用(yong)(yong)小手锤锤平,并用(yong)(yong)什(shen)锦(jin)锉修理成楔形;

③再把经以上处理的铜片塞到线电极加(jia)工(gong)所形成的缝隙(xi)里(li),同时(shi)在工(gong)件该(gai)部分的表面滴上502胶水(即环氧(yang)树(shu)脂瞬(shun)时(shi)快干胶)。

由于切割(ge)(ge)时,电(dian)(dian)火花线切割(ge)(ge)机(ji)冲水(shui)使工件所受压(ya)力较大,若单纯用铜(tong)(tong)片(pian)(pian)塞(sai)紧来(lai)保(bao)证(zheng)导电(dian)(dian)和固定(ding),容(rong)易(yi)产生以下(xia)问题:(a)铜(tong)(tong)片(pian)(pian)塞(sai)得太松,担心固定(ding)不(bu)可靠、导电(dian)(dian)不(bu)稳定(ding);(b)铜(tong)(tong)片(pian)(pian)塞(sai)得太紧,又(you)担心损(sun)伤工件表面、破坏形位公(gong)差,所以采用502胶水(shui)来(lai)保(bao)证(zheng)被切割(ge)(ge)部分(fen)与母(mu)体材料(liao)固定(ding);

④在将铜片(pian)塞进(jin)加工(gong)部(bu)(bu)位(wei)时,应注意是(shi):用502胶(jiao)水(shui)粘贴连接(jie)铜片(pian)时应远离(li)工(gong)件(jian)(jian)余留(liu)部(bu)(bu)件(jian)(jian)处,以(yi)免(mian)502胶(jiao)水(shui)渗到(dao),造成绝缘。此(ci)外(wai)粘贴连接(jie)铜片(pian)的位(wei)置应考虑对称分(fen)布,且应保证同时塞紧,避免(mian)工(gong)件(jian)(jian)发生偏移(yi),以(yi)致影响(xiang)工(gong)件(jian)(jian)加工(gong)质量(liang)。保证被(bei)切割工(gong)件(jian)(jian)余留(liu)部(bu)(bu)位(wei)形状的正确性和精度的可靠(kao)性。

(2)在(zai)被切(qie)割(ge)部(bu)分(fen)与母体(ti)材料之(zhi)间填(tian)(tian)充导电(dian)(dian)铜(tong)片(pian)(pian)。把经折叠、剪齐(qi)、锤(chui)平和修锉的(de)薄(bo)铜(tong)片(pian)(pian)填(tian)(tian)充在(zai)线电(dian)(dian)极加工(gong)形成的(de)缝隙(xi)里,并使铜(tong)片(pian)(pian)和缝隙(xi)壁紧(jin)密贴合。填(tian)(tian)充此铜(tong)片(pian)(pian)的(de)目的(de)是为(wei)了(le)导电(dian)(dian),因为(wei)前(qian)面粘贴连(lian)接(jie)铜(tong)片(pian)(pian)时(shi)(shi)用了(le)502胶水,而502胶水是不(bu)导电(dian)(dian)的(de)。为(wei)了(le)实(shi)现导电(dian)(dian)要求,故采用填(tian)(tian)充导电(dian)(dian)铜(tong)片(pian)(pian)的(de)方法,填(tian)(tian)充导电(dian)(dian)铜(tong)片(pian)(pian)时(shi)(shi)同样应注意铜(tong)片(pian)(pian)的(de)对称布置以(yi)及铜(tong)片(pian)(pian)应同时(shi)(shi)加紧(jin),并且不(bu)能塞得过(guo)紧(jin)以(yi)免(mian)划(hua)伤工(gong)件的(de)表(biao)面。不(bu)管是粘贴连(lian)接(jie)铜(tong)片(pian)(pian)还是填(tian)(tian)充导电(dian)(dian)铜(tong)缝隙(xi)的(de)形状。都(dou)应该把小铜(tong)片(pian)(pian)制(zhi)成圆弧形,而且还应该用金相砂布打磨被锤(chui)过(guo)的(de)铜(tong)片(pian)(pian)表(biao)面,以(yi)保证铜(tong)片(pian)(pian)表(biao)面光滑以(yi)避免(mian)划(hua)伤工(gong)件已加工(gong)过(guo)的(de)表(biao)面。

在采用(yong)(yong)电火花线(xian)(xian)切(qie)(qie)割(ge)机加工(gong)(gong)高(gao)(gao)硬度、高(gao)(gao)精(jing)度和(he)高(gao)(gao)复杂(za)度的(de)小型(xing)工(gong)(gong)件时,按照上(shang)述方(fang)法(fa)(fa)和(he)步(bu)(bu)骤进行(xing)线(xian)(xian)切(qie)(qie)割(ge)加工(gong)(gong)中工(gong)(gong)件余留部位的(de)精(jing)密切(qie)(qie)割(ge),是一种行(xing)之有效(xiao)的(de)方(fang)法(fa)(fa),它(ta)所(suo)提出(chu)(chu)的(de)步(bu)(bu)骤和(he)技巧,经(jing)济简便、实(shi)用(yong)(yong)可行(xing),从(cong)而(er)为改善和(he)提高(gao)(gao)精(jing)密线(xian)(xian)切(qie)(qie)割(ge)加工(gong)(gong)的(de)质(zhi)量(liang)和(he)效(xiao)率探索出(chu)(chu)新的(de)途(tu)径(jing)。


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