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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://h1820.cn 点击:

对于(yu)线(xian)(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)工(gong)(gong)件(jian)余(yu)留(liu)部(bu)(bu)(bu)位(wei)切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)的(de)多次加(jia)(jia)工(gong)(gong),首先必须解(jie)决被(bei)加(jia)(jia)工(gong)(gong)工(gong)(gong)件(jian)的(de)导(dao)电问题,因为在(zai)高精度线(xian)(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)加(jia)(jia)工(gong)(gong)中(zhong),线(xian)(xian)(xian)(xian)电极的(de)行(xing)(xing)走(zou)(zou)路(lu)线(xian)(xian)(xian)(xian)可(ke)能需(xu)要沿加(jia)(jia)工(gong)(gong)轨迹往复行(xing)(xing)走(zou)(zou)多次,才(cai)能保证(zheng)被(bei)加(jia)(jia)工(gong)(gong)工(gong)(gong)件(jian)具(ju)有较高表面(mian)粗糙度和(he)(he)表面(mian)精度,这(zhei)时线(xian)(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)加(jia)(jia)工(gong)(gong)是靠(kao)工(gong)(gong)件(jian)余(yu)留(liu)部(bu)(bu)(bu)位(wei)起(qi)到导(dao)电作用以(yi)保障电加(jia)(jia)工(gong)(gong)正(zheng)常进(jin)行(xing)(xing)。但在(zai)进(jin)行(xing)(xing)工(gong)(gong)件(jian)余(yu)留(liu)部(bu)(bu)(bu)位(wei)的(de)切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)加(jia)(jia)工(gong)(gong)时,若第一次切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)即(ji)切(qie)(qie)(qie)下工(gong)(gong)件(jian)余(yu)留(liu)部(bu)(bu)(bu)位(wei),将会(hui)导(dao)致被(bei)切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)部(bu)(bu)(bu)分与母体分离,以(yi)致导(dao)电回(hui)路(lu)中(zhong)断,无法进(jin)行(xing)(xing)继续加(jia)(jia)工(gong)(gong),所以(yi)从线(xian)(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)加(jia)(jia)工(gong)(gong)的(de)条件(jian)性(xing)和(he)(he)延续性(xing)考虑(lv),必须使(shi)工(gong)(gong)件(jian)余(yu)留(liu)部(bu)(bu)(bu)位(wei)即(ji)便在(zai)多次切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)的(de)情(qing)况(kuang)下也能保持与母体之间正(zheng)常导(dao)电的(de)要求。

为(wei)了实(shi)现(xian)上述目的,操作(zuo)工(gong)人力(li)图营造(zao)人为(wei)环境和条(tiao)件来满(man)足导电要(yao)求,即当工(gong)作(zuo)人员在(zai)操作(zuo)电火花(hua)线切(qie)割机(ji)遇到切(qie)割工(gong)件余留部位(wei)时,可采(cai)用(yong)在(zai)被切(qie)割部分和母体(ti)之间粘铜片(pian)(pian)和在(zai)切(qie)割间隙中塞(sai)铜片(pian)(pian)的处(chu)理方法(fa)来造(zao)成人为(wei)的定位(wei)条(tiao)件和导电条(tiao)件,使是火花(hua)加工(gong)得以继续(xu)进(jin)行,其具体(ti)做法(fa)与技巧(qiao)如下:

(1)在被切割部(bu)分与(yu)母体(ti)材(cai)料(liao)之间粘贴连接铜片。其目的(de)是使工(gong)件(jian)余(yu)留部(bu)分在切割时(shi)与(yu)母体(ti)材(cai)料(liao)相连固定(ding),保(bao)证线切割有良好的(de)定(ding)位条件(jian),从而保(bao)障工(gong)件(jian)有优异的(de)加工(gong)质量(liang),这(zhei)可依(yi)照(zhao)以下步骤进行:

①首先根据加工工件的大小把薄铜片(厚度(du)根据线电极情况和(he)加工部位形(xing)状而定)剪(jian)成长条形(xing),然后(hou)折叠,井(jing)保证折叠部分(fen)一(yi)(yi)长一(yi)(yi)短。

②然后把铜片(pian)折(zhe)叠的(de)弯曲(qu)部分用小手锤锤平,并用什(shen)锦(jin)锉修理(li)成楔形;

③再把经以上(shang)处理(li)的铜片塞到线电极加(jia)工所(suo)形成的缝(feng)隙里,同时在工件该(gai)部分的表(biao)面滴上(shang)502胶(jiao)水(即环氧树脂瞬时快(kuai)干胶(jiao))。

由于切割(ge)时,电火(huo)花线切割(ge)机(ji)冲水(shui)使工件(jian)所受(shou)压力较大(da),若单(dan)纯用(yong)铜片塞紧(jin)(jin)来保(bao)证(zheng)导电和固定(ding),容易产生以下问题:(a)铜片塞得太松(song),担心固定(ding)不可(ke)靠、导电不稳定(ding);(b)铜片塞得太紧(jin)(jin),又担心损伤(shang)工件(jian)表面、破坏形(xing)位(wei)公(gong)差,所以采用(yong)502胶水(shui)来保(bao)证(zheng)被切割(ge)部分(fen)与母体材(cai)料固定(ding);

④在将铜片(pian)塞(sai)进加(jia)工部(bu)位时,应(ying)注意是:用(yong)502胶水(shui)粘贴(tie)连接(jie)铜片(pian)时应(ying)远离工件余留部(bu)件处,以(yi)免502胶水(shui)渗到(dao),造(zao)成(cheng)绝缘(yuan)。此外粘贴(tie)连接(jie)铜片(pian)的位置应(ying)考虑对称分(fen)布(bu),且应(ying)保证(zheng)同时塞(sai)紧,避免工件发生偏移,以(yi)致影响工件加(jia)工质量。保证(zheng)被切(qie)割工件余留部(bu)位形(xing)状(zhuang)的正确性和精度的可靠性。

(2)在被切割部分与母体(ti)材(cai)料之间填(tian)充(chong)(chong)(chong)导(dao)电(dian)铜(tong)片。把经折(zhe)叠、剪齐、锤平和修锉的(de)(de)(de)(de)薄铜(tong)片填(tian)充(chong)(chong)(chong)在线电(dian)极加(jia)工形(xing)成(cheng)的(de)(de)(de)(de)缝(feng)隙里,并使铜(tong)片和缝(feng)隙壁紧密贴合。填(tian)充(chong)(chong)(chong)此铜(tong)片的(de)(de)(de)(de)目的(de)(de)(de)(de)是(shi)为了导(dao)电(dian),因为前面(mian)(mian)粘贴连接铜(tong)片时用(yong)了502胶(jiao)水,而502胶(jiao)水是(shi)不导(dao)电(dian)的(de)(de)(de)(de)。为了实现导(dao)电(dian)要求,故采用(yong)填(tian)充(chong)(chong)(chong)导(dao)电(dian)铜(tong)片的(de)(de)(de)(de)方法,填(tian)充(chong)(chong)(chong)导(dao)电(dian)铜(tong)片时同样应注意(yi)铜(tong)片的(de)(de)(de)(de)对称布置以(yi)及铜(tong)片应同时加(jia)紧,并且不能塞得过(guo)紧以(yi)免划伤工件的(de)(de)(de)(de)表(biao)面(mian)(mian)。不管是(shi)粘贴连接铜(tong)片还(hai)(hai)是(shi)填(tian)充(chong)(chong)(chong)导(dao)电(dian)铜(tong)缝(feng)隙的(de)(de)(de)(de)形(xing)状(zhuang)。都(dou)应该把小铜(tong)片制成(cheng)圆弧形(xing),而且还(hai)(hai)应该用(yong)金相(xiang)砂布打磨被锤过(guo)的(de)(de)(de)(de)铜(tong)片表(biao)面(mian)(mian),以(yi)保证铜(tong)片表(biao)面(mian)(mian)光滑以(yi)避免划伤工件已加(jia)工过(guo)的(de)(de)(de)(de)表(biao)面(mian)(mian)。

在(zai)采用(yong)电火花线切割(ge)机(ji)加工(gong)(gong)(gong)高硬度、高精度和(he)(he)高复杂度的(de)(de)(de)小型(xing)工(gong)(gong)(gong)件时,按照上述方(fang)法和(he)(he)步(bu)骤进行线切割(ge)加工(gong)(gong)(gong)中(zhong)工(gong)(gong)(gong)件余留部位的(de)(de)(de)精密(mi)切割(ge),是(shi)一种行之有效(xiao)的(de)(de)(de)方(fang)法,它所提出(chu)的(de)(de)(de)步(bu)骤和(he)(he)技巧,经济简便、实用(yong)可行,从(cong)而为改善(shan)和(he)(he)提高精密(mi)线切割(ge)加工(gong)(gong)(gong)的(de)(de)(de)质量和(he)(he)效(xiao)率探索出(chu)新的(de)(de)(de)途径(jing)。


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