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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://njyiwen.com.cn 点击:

对(dui)于线(xian)(xian)(xian)切(qie)(qie)(qie)(qie)割(ge)(ge)工(gong)(gong)件(jian)余(yu)留部(bu)(bu)位(wei)(wei)切(qie)(qie)(qie)(qie)割(ge)(ge)的(de)多次加(jia)(jia)(jia)(jia)工(gong)(gong),首先必须(xu)解决(jue)被(bei)加(jia)(jia)(jia)(jia)工(gong)(gong)工(gong)(gong)件(jian)的(de)导(dao)(dao)电(dian)(dian)问题,因(yin)为在高精(jing)度线(xian)(xian)(xian)切(qie)(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)中(zhong),线(xian)(xian)(xian)电(dian)(dian)极(ji)的(de)行走(zou)路线(xian)(xian)(xian)可能需要沿加(jia)(jia)(jia)(jia)工(gong)(gong)轨迹往复行走(zou)多次,才能保证被(bei)加(jia)(jia)(jia)(jia)工(gong)(gong)工(gong)(gong)件(jian)具有(you)较(jiao)高表面(mian)粗糙度和表面(mian)精(jing)度,这时线(xian)(xian)(xian)切(qie)(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)是靠(kao)工(gong)(gong)件(jian)余(yu)留部(bu)(bu)位(wei)(wei)起(qi)到导(dao)(dao)电(dian)(dian)作用以保障(zhang)电(dian)(dian)加(jia)(jia)(jia)(jia)工(gong)(gong)正(zheng)常(chang)进行。但在进行工(gong)(gong)件(jian)余(yu)留部(bu)(bu)位(wei)(wei)的(de)切(qie)(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)时,若第一次切(qie)(qie)(qie)(qie)割(ge)(ge)即(ji)切(qie)(qie)(qie)(qie)下(xia)工(gong)(gong)件(jian)余(yu)留部(bu)(bu)位(wei)(wei),将会导(dao)(dao)致(zhi)被(bei)切(qie)(qie)(qie)(qie)割(ge)(ge)部(bu)(bu)分(fen)与母体(ti)分(fen)离(li),以致(zhi)导(dao)(dao)电(dian)(dian)回路中(zhong)断,无法进行继续加(jia)(jia)(jia)(jia)工(gong)(gong),所以从线(xian)(xian)(xian)切(qie)(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)(jia)(jia)工(gong)(gong)的(de)条件(jian)性和延续性考(kao)虑(lv),必须(xu)使工(gong)(gong)件(jian)余(yu)留部(bu)(bu)位(wei)(wei)即(ji)便在多次切(qie)(qie)(qie)(qie)割(ge)(ge)的(de)情况下(xia)也能保持(chi)与母体(ti)之间正(zheng)常(chang)导(dao)(dao)电(dian)(dian)的(de)要求。

为了实现(xian)上(shang)述(shu)目的(de)(de),操作(zuo)工人力图(tu)营(ying)造(zao)(zao)人为环(huan)境和(he)条(tiao)件来满足(zu)导电要求,即(ji)当工作(zuo)人员在操作(zuo)电火花线切割(ge)机遇到切割(ge)工件余(yu)留部(bu)位时(shi),可采用在被(bei)切割(ge)部(bu)分和(he)母体之间粘铜片和(he)在切割(ge)间隙(xi)中塞铜片的(de)(de)处理(li)方法(fa)来造(zao)(zao)成(cheng)人为的(de)(de)定(ding)位条(tiao)件和(he)导电条(tiao)件,使是火花加(jia)工得以继续进行,其具体做(zuo)法(fa)与(yu)技巧如下:

(1)在被切割部分与母体材料之间粘贴连接(jie)铜(tong)片。其目的是使工(gong)件(jian)余留部分在切割时与母体材料相连固定,保证(zheng)线切割有良好(hao)的定位条件(jian),从而保障工(gong)件(jian)有优(you)异的加工(gong)质(zhi)量,这可依照以下步骤进行:

①首先根据(ju)加(jia)工工件的(de)大(da)小把薄铜片(厚度根据(ju)线电极情况和加(jia)工部位形(xing)状而(er)定(ding))剪(jian)成长条形(xing),然后折叠,井保(bao)证(zheng)折叠部分一长一短。

②然后把铜片(pian)折叠的弯曲部分(fen)用小手锤(chui)锤(chui)平,并用什锦锉修理成楔形;

③再把经以上(shang)处(chu)理的铜片塞到线(xian)电极加(jia)工(gong)所形成的缝(feng)隙(xi)里(li),同时在工(gong)件该部分的表(biao)面滴(di)上(shang)502胶(jiao)水(即环氧树脂瞬时快干(gan)胶(jiao))。

由于切(qie)割时,电(dian)火花线切(qie)割机(ji)冲水使工(gong)件所受压力较大,若(ruo)单纯(chun)用(yong)铜片塞(sai)紧来保(bao)证(zheng)导电(dian)和固定(ding),容易产生以下问(wen)题:(a)铜片塞(sai)得太松,担心(xin)固定(ding)不可靠(kao)、导电(dian)不稳定(ding);(b)铜片塞(sai)得太紧,又担心(xin)损伤(shang)工(gong)件表面、破坏形位公差,所以采(cai)用(yong)502胶水来保(bao)证(zheng)被切(qie)割部分与母体材(cai)料(liao)固定(ding);

④在将(jiang)铜(tong)片(pian)(pian)塞(sai)进加工部(bu)(bu)位(wei)时(shi),应注意是(shi):用502胶水粘(zhan)贴(tie)(tie)连(lian)接铜(tong)片(pian)(pian)时(shi)应远离工件(jian)余留部(bu)(bu)件(jian)处,以免502胶水渗到,造成(cheng)绝(jue)缘。此外粘(zhan)贴(tie)(tie)连(lian)接铜(tong)片(pian)(pian)的(de)(de)位(wei)置应考虑(lv)对(dui)称分布,且应保证同时(shi)塞(sai)紧,避免工件(jian)发(fa)生偏移,以致影响工件(jian)加工质量(liang)。保证被切割工件(jian)余留部(bu)(bu)位(wei)形状的(de)(de)正确性(xing)和精度的(de)(de)可靠(kao)性(xing)。

(2)在(zai)被(bei)切割部分与母体材(cai)料之(zhi)间(jian)填(tian)充(chong)导(dao)(dao)(dao)电铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)。把经(jing)折叠、剪齐、锤(chui)平(ping)和修锉的(de)薄铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)填(tian)充(chong)在(zai)线(xian)电极加工(gong)形(xing)(xing)成(cheng)的(de)缝隙(xi)里,并(bing)使(shi)铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)和缝隙(xi)壁紧(jin)密贴合。填(tian)充(chong)此铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)的(de)目的(de)是为(wei)了导(dao)(dao)(dao)电,因为(wei)前面(mian)(mian)(mian)粘贴连接(jie)铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)时(shi)用了502胶(jiao)水(shui),而502胶(jiao)水(shui)是不(bu)导(dao)(dao)(dao)电的(de)。为(wei)了实现(xian)导(dao)(dao)(dao)电要(yao)求(qiu),故采用填(tian)充(chong)导(dao)(dao)(dao)电铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)的(de)方(fang)法(fa),填(tian)充(chong)导(dao)(dao)(dao)电铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)时(shi)同样应(ying)(ying)(ying)注意(yi)铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)的(de)对(dui)称布置(zhi)以及铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)应(ying)(ying)(ying)同时(shi)加紧(jin),并(bing)且不(bu)能塞得过(guo)紧(jin)以免划伤工(gong)件的(de)表(biao)面(mian)(mian)(mian)。不(bu)管是粘贴连接(jie)铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)还是填(tian)充(chong)导(dao)(dao)(dao)电铜(tong)(tong)(tong)(tong)缝隙(xi)的(de)形(xing)(xing)状。都应(ying)(ying)(ying)该(gai)把小铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)制成(cheng)圆弧形(xing)(xing),而且还应(ying)(ying)(ying)该(gai)用金相砂布打磨被(bei)锤(chui)过(guo)的(de)铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)表(biao)面(mian)(mian)(mian),以保证铜(tong)(tong)(tong)(tong)片(pian)(pian)(pian)表(biao)面(mian)(mian)(mian)光滑以避(bi)免划伤工(gong)件已加工(gong)过(guo)的(de)表(biao)面(mian)(mian)(mian)。

在采(cai)用电火花线切(qie)(qie)(qie)割(ge)机(ji)加工(gong)高(gao)硬度(du)、高(gao)精(jing)度(du)和(he)高(gao)复杂度(du)的(de)小型工(gong)件(jian)时(shi),按照上述方法(fa)和(he)步(bu)骤(zhou)进行线切(qie)(qie)(qie)割(ge)加工(gong)中(zhong)工(gong)件(jian)余留(liu)部位的(de)精(jing)密切(qie)(qie)(qie)割(ge),是一(yi)种(zhong)行之有(you)效(xiao)的(de)方法(fa),它所提出的(de)步(bu)骤(zhou)和(he)技巧,经(jing)济简便、实(shi)用可(ke)行,从(cong)而(er)为改善和(he)提高(gao)精(jing)密线切(qie)(qie)(qie)割(ge)加工(gong)的(de)质量和(he)效(xiao)率探索出新(xin)的(de)途(tu)径。


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