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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://bennee.cn 点击:

对(dui)于线(xian)切(qie)割(ge)(ge)工(gong)(gong)(gong)(gong)件(jian)(jian)余(yu)留部(bu)位(wei)(wei)切(qie)割(ge)(ge)的(de)多(duo)次(ci)加(jia)工(gong)(gong)(gong)(gong),首(shou)先必须解决被(bei)加(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)(jian)的(de)导(dao)(dao)电(dian)问题(ti),因为在(zai)高精度(du)线(xian)切(qie)割(ge)(ge)加(jia)工(gong)(gong)(gong)(gong)中(zhong),线(xian)电(dian)极的(de)行走路(lu)线(xian)可能需要沿加(jia)工(gong)(gong)(gong)(gong)轨迹(ji)往复行走多(duo)次(ci),才能保(bao)证被(bei)加(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)(jian)具有较高表面粗糙度(du)和表面精度(du),这时线(xian)切(qie)割(ge)(ge)加(jia)工(gong)(gong)(gong)(gong)是靠工(gong)(gong)(gong)(gong)件(jian)(jian)余(yu)留部(bu)位(wei)(wei)起到(dao)导(dao)(dao)电(dian)作用以保(bao)障电(dian)加(jia)工(gong)(gong)(gong)(gong)正常(chang)进(jin)行。但在(zai)进(jin)行工(gong)(gong)(gong)(gong)件(jian)(jian)余(yu)留部(bu)位(wei)(wei)的(de)切(qie)割(ge)(ge)加(jia)工(gong)(gong)(gong)(gong)时,若(ruo)第一次(ci)切(qie)割(ge)(ge)即切(qie)下(xia)工(gong)(gong)(gong)(gong)件(jian)(jian)余(yu)留部(bu)位(wei)(wei),将会导(dao)(dao)致被(bei)切(qie)割(ge)(ge)部(bu)分与(yu)母(mu)(mu)体(ti)分离(li),以致导(dao)(dao)电(dian)回路(lu)中(zhong)断,无法进(jin)行继续(xu)加(jia)工(gong)(gong)(gong)(gong),所以从线(xian)切(qie)割(ge)(ge)加(jia)工(gong)(gong)(gong)(gong)的(de)条件(jian)(jian)性和延续(xu)性考虑,必须使工(gong)(gong)(gong)(gong)件(jian)(jian)余(yu)留部(bu)位(wei)(wei)即便在(zai)多(duo)次(ci)切(qie)割(ge)(ge)的(de)情况下(xia)也能保(bao)持与(yu)母(mu)(mu)体(ti)之间正常(chang)导(dao)(dao)电(dian)的(de)要求。

为(wei)了实现上述(shu)目的(de),操(cao)作(zuo)工(gong)(gong)人力图营(ying)造(zao)人为(wei)环境和条(tiao)件(jian)(jian)来满足导电(dian)(dian)要求,即当工(gong)(gong)作(zuo)人员在操(cao)作(zuo)电(dian)(dian)火花(hua)线切割(ge)(ge)机遇到切割(ge)(ge)工(gong)(gong)件(jian)(jian)余(yu)留(liu)部位时(shi),可采用在被切割(ge)(ge)部分和母体之间粘铜(tong)片和在切割(ge)(ge)间隙中塞(sai)铜(tong)片的(de)处理(li)方(fang)法来造(zao)成(cheng)人为(wei)的(de)定位条(tiao)件(jian)(jian)和导电(dian)(dian)条(tiao)件(jian)(jian),使是火花(hua)加工(gong)(gong)得以继续进(jin)行,其(qi)具体做法与技巧如下:

(1)在(zai)被(bei)切(qie)割(ge)部(bu)分与(yu)母(mu)体(ti)材料(liao)之间粘贴连接(jie)铜片。其目的是使工件(jian)(jian)余留部(bu)分在(zai)切(qie)割(ge)时与(yu)母(mu)体(ti)材料(liao)相连固(gu)定,保证线切(qie)割(ge)有良好的定位(wei)条(tiao)件(jian)(jian),从而保障工件(jian)(jian)有优异的加(jia)工质量,这可(ke)依照以下步骤进行:

①首先(xian)根据加工(gong)工(gong)件的(de)大小把薄铜(tong)片(厚(hou)度根据线(xian)电(dian)极情况(kuang)和加工(gong)部(bu)(bu)位形状而定)剪(jian)成长条(tiao)形,然后折(zhe)叠(die),井(jing)保证折(zhe)叠(die)部(bu)(bu)分一(yi)长一(yi)短。

②然后(hou)把(ba)铜片(pian)折叠的弯(wan)曲部分用小(xiao)手(shou)锤锤平(ping),并用什锦(jin)锉修理成楔形;

③再把经以上处理的(de)铜片(pian)塞到线电极加工所(suo)形(xing)成的(de)缝隙里,同时在工件该部分的(de)表面滴(di)上502胶(jiao)水(即(ji)环(huan)氧树脂瞬时快干胶(jiao))。

由于切(qie)割(ge)时,电(dian)火花(hua)线切(qie)割(ge)机(ji)冲水使工件(jian)所(suo)受压力较(jiao)大,若单纯用铜片塞(sai)紧来(lai)保(bao)证导电(dian)和固(gu)定,容(rong)易产(chan)生以下问题:(a)铜片塞(sai)得太松,担(dan)心固(gu)定不可(ke)靠、导电(dian)不稳定;(b)铜片塞(sai)得太紧,又(you)担(dan)心损伤工件(jian)表面(mian)、破(po)坏(huai)形位公差,所(suo)以采(cai)用502胶(jiao)水来(lai)保(bao)证被切(qie)割(ge)部(bu)分与母体材(cai)料固(gu)定;

④在将(jiang)铜(tong)片(pian)(pian)塞进加工(gong)部位时(shi),应(ying)注(zhu)意是(shi):用502胶(jiao)水粘贴连(lian)接(jie)铜(tong)片(pian)(pian)时(shi)应(ying)远离工(gong)件(jian)(jian)(jian)余留(liu)部件(jian)(jian)(jian)处,以免(mian)502胶(jiao)水渗到,造成绝缘(yuan)。此外粘贴连(lian)接(jie)铜(tong)片(pian)(pian)的(de)(de)位置应(ying)考虑对称(cheng)分布,且应(ying)保证同(tong)时(shi)塞紧,避免(mian)工(gong)件(jian)(jian)(jian)发生偏移,以致影响工(gong)件(jian)(jian)(jian)加工(gong)质量。保证被切割工(gong)件(jian)(jian)(jian)余留(liu)部位形状的(de)(de)正确性和精度的(de)(de)可靠性。

(2)在被(bei)切割部分与母体材料(liao)之(zhi)间填(tian)充(chong)(chong)(chong)导(dao)(dao)电(dian)(dian)(dian)铜(tong)(tong)(tong)片(pian)(pian)(pian)。把(ba)经折叠、剪齐、锤平和修锉的(de)(de)(de)薄铜(tong)(tong)(tong)片(pian)(pian)(pian)填(tian)充(chong)(chong)(chong)在线电(dian)(dian)(dian)极(ji)加工(gong)(gong)形(xing)成的(de)(de)(de)缝隙里,并使(shi)铜(tong)(tong)(tong)片(pian)(pian)(pian)和缝隙壁紧(jin)(jin)密贴(tie)合(he)。填(tian)充(chong)(chong)(chong)此铜(tong)(tong)(tong)片(pian)(pian)(pian)的(de)(de)(de)目的(de)(de)(de)是(shi)为了导(dao)(dao)电(dian)(dian)(dian),因为前面(mian)粘(zhan)贴(tie)连(lian)接铜(tong)(tong)(tong)片(pian)(pian)(pian)时用(yong)了502胶水,而502胶水是(shi)不(bu)导(dao)(dao)电(dian)(dian)(dian)的(de)(de)(de)。为了实现(xian)导(dao)(dao)电(dian)(dian)(dian)要求,故采用(yong)填(tian)充(chong)(chong)(chong)导(dao)(dao)电(dian)(dian)(dian)铜(tong)(tong)(tong)片(pian)(pian)(pian)的(de)(de)(de)方法,填(tian)充(chong)(chong)(chong)导(dao)(dao)电(dian)(dian)(dian)铜(tong)(tong)(tong)片(pian)(pian)(pian)时同样(yang)应(ying)(ying)(ying)注意铜(tong)(tong)(tong)片(pian)(pian)(pian)的(de)(de)(de)对称(cheng)布置以(yi)及铜(tong)(tong)(tong)片(pian)(pian)(pian)应(ying)(ying)(ying)同时加紧(jin)(jin),并且(qie)不(bu)能塞得过紧(jin)(jin)以(yi)免划(hua)伤(shang)工(gong)(gong)件的(de)(de)(de)表面(mian)。不(bu)管是(shi)粘(zhan)贴(tie)连(lian)接铜(tong)(tong)(tong)片(pian)(pian)(pian)还是(shi)填(tian)充(chong)(chong)(chong)导(dao)(dao)电(dian)(dian)(dian)铜(tong)(tong)(tong)缝隙的(de)(de)(de)形(xing)状。都应(ying)(ying)(ying)该把(ba)小铜(tong)(tong)(tong)片(pian)(pian)(pian)制成圆弧形(xing),而且(qie)还应(ying)(ying)(ying)该用(yong)金相砂布打磨被(bei)锤过的(de)(de)(de)铜(tong)(tong)(tong)片(pian)(pian)(pian)表面(mian),以(yi)保证(zheng)铜(tong)(tong)(tong)片(pian)(pian)(pian)表面(mian)光滑以(yi)避免划(hua)伤(shang)工(gong)(gong)件已加工(gong)(gong)过的(de)(de)(de)表面(mian)。

在采用(yong)电火花线切割(ge)(ge)机(ji)加工(gong)高(gao)(gao)硬度(du)、高(gao)(gao)精(jing)(jing)度(du)和高(gao)(gao)复杂度(du)的小型工(gong)件(jian)时,按照上述方法和步(bu)骤(zhou)进行(xing)线切割(ge)(ge)加工(gong)中工(gong)件(jian)余留部位(wei)的精(jing)(jing)密切割(ge)(ge),是一种行(xing)之有(you)效(xiao)的方法,它(ta)所提(ti)出的步(bu)骤(zhou)和技巧,经济简便(bian)、实(shi)用(yong)可(ke)行(xing),从(cong)而为改善和提(ti)高(gao)(gao)精(jing)(jing)密线切割(ge)(ge)加工(gong)的质量和效(xiao)率探索出新的途径(jing)。


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