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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://mtxn.com.cn 点击:

对于线(xian)(xian)(xian)切(qie)(qie)(qie)(qie)割(ge)(ge)工(gong)(gong)(gong)件余(yu)(yu)留(liu)部(bu)位(wei)(wei)切(qie)(qie)(qie)(qie)割(ge)(ge)的(de)多(duo)次(ci)(ci)加(jia)(jia)工(gong)(gong)(gong),首先(xian)必须(xu)解决(jue)被(bei)(bei)加(jia)(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件的(de)导(dao)电(dian)(dian)问题,因(yin)为在高(gao)精(jing)度线(xian)(xian)(xian)切(qie)(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)中,线(xian)(xian)(xian)电(dian)(dian)极的(de)行(xing)走(zou)(zou)路(lu)线(xian)(xian)(xian)可能(neng)需(xu)要(yao)沿加(jia)(jia)工(gong)(gong)(gong)轨迹往复(fu)行(xing)走(zou)(zou)多(duo)次(ci)(ci),才能(neng)保(bao)证被(bei)(bei)加(jia)(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件具有较(jiao)高(gao)表面粗糙度和(he)表面精(jing)度,这(zhei)时(shi)线(xian)(xian)(xian)切(qie)(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)是靠工(gong)(gong)(gong)件余(yu)(yu)留(liu)部(bu)位(wei)(wei)起到导(dao)电(dian)(dian)作用以(yi)保(bao)障(zhang)电(dian)(dian)加(jia)(jia)工(gong)(gong)(gong)正常(chang)(chang)进(jin)行(xing)。但(dan)在进(jin)行(xing)工(gong)(gong)(gong)件余(yu)(yu)留(liu)部(bu)位(wei)(wei)的(de)切(qie)(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)时(shi),若第(di)一次(ci)(ci)切(qie)(qie)(qie)(qie)割(ge)(ge)即切(qie)(qie)(qie)(qie)下工(gong)(gong)(gong)件余(yu)(yu)留(liu)部(bu)位(wei)(wei),将会导(dao)致被(bei)(bei)切(qie)(qie)(qie)(qie)割(ge)(ge)部(bu)分与母(mu)体分离(li),以(yi)致导(dao)电(dian)(dian)回路(lu)中断,无法(fa)进(jin)行(xing)继续加(jia)(jia)工(gong)(gong)(gong),所以(yi)从线(xian)(xian)(xian)切(qie)(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)的(de)条(tiao)件性和(he)延续性考虑,必须(xu)使(shi)工(gong)(gong)(gong)件余(yu)(yu)留(liu)部(bu)位(wei)(wei)即便在多(duo)次(ci)(ci)切(qie)(qie)(qie)(qie)割(ge)(ge)的(de)情况下也能(neng)保(bao)持与母(mu)体之(zhi)间正常(chang)(chang)导(dao)电(dian)(dian)的(de)要(yao)求(qiu)。

为了实现上(shang)述目(mu)的,操(cao)作(zuo)工(gong)人(ren)力图营造(zao)人(ren)为环境和(he)(he)条(tiao)件(jian)来满足导电要求(qiu),即当工(gong)作(zuo)人(ren)员在(zai)操(cao)作(zuo)电火(huo)花(hua)线切割(ge)机(ji)遇到切割(ge)工(gong)件(jian)余留(liu)部(bu)位时(shi),可采用在(zai)被切割(ge)部(bu)分(fen)和(he)(he)母体(ti)之(zhi)间粘(zhan)铜片(pian)和(he)(he)在(zai)切割(ge)间隙中塞铜片(pian)的处理方法来造(zao)成(cheng)人(ren)为的定位条(tiao)件(jian)和(he)(he)导电条(tiao)件(jian),使是火(huo)花(hua)加(jia)工(gong)得(de)以继(ji)续(xu)进行,其具(ju)体(ti)做法与技巧如下:

(1)在(zai)被切(qie)割(ge)部分与母(mu)体材料之间粘(zhan)贴连接(jie)铜片。其目的(de)(de)是使工(gong)件余留部分在(zai)切(qie)割(ge)时与母(mu)体材料相连固定(ding),保(bao)证线切(qie)割(ge)有良好的(de)(de)定(ding)位条件,从而保(bao)障(zhang)工(gong)件有优(you)异(yi)的(de)(de)加工(gong)质量,这(zhei)可依照(zhao)以下步骤进行:

①首先根(gen)据加(jia)工工件(jian)的大小把薄铜片(厚度根(gen)据线电极(ji)情(qing)况(kuang)和加(jia)工部位形状而定)剪成长条形,然后(hou)折叠(die),井(jing)保(bao)证折叠(die)部分一长一短(duan)。

②然(ran)后把铜(tong)片折叠(die)的弯曲部分用小手锤(chui)(chui)锤(chui)(chui)平(ping),并用什锦锉修(xiu)理成楔形;

③再把(ba)经以上处(chu)理的(de)铜(tong)片塞(sai)到线电极加工所形成(cheng)的(de)缝隙里,同时在工件(jian)该部分的(de)表(biao)面滴(di)上502胶水(即(ji)环氧(yang)树脂瞬时快干胶)。

由于切(qie)割时,电火花线切(qie)割机冲水使工(gong)件所(suo)受压力较大,若单纯用铜片(pian)塞(sai)紧来保证(zheng)导电和固定(ding),容易产生以下问题(ti):(a)铜片(pian)塞(sai)得太松,担心(xin)固定(ding)不(bu)可靠、导电不(bu)稳(wen)定(ding);(b)铜片(pian)塞(sai)得太紧,又(you)担心(xin)损伤工(gong)件表(biao)面、破坏(huai)形位公差,所(suo)以采用502胶水来保证(zheng)被切(qie)割部(bu)分与母体材料(liao)固定(ding);

④在(zai)将铜片塞进加(jia)(jia)工部位时,应(ying)注意是:用502胶(jiao)水粘贴(tie)连接(jie)铜片时应(ying)远离工件(jian)余留部件(jian)处,以免502胶(jiao)水渗到,造成绝缘。此(ci)外粘贴(tie)连接(jie)铜片的(de)位置应(ying)考虑(lv)对称分布,且应(ying)保证(zheng)同时塞紧(jin),避免工件(jian)发生偏移,以致影响工件(jian)加(jia)(jia)工质(zhi)量(liang)。保证(zheng)被切割工件(jian)余留部位形状的(de)正(zheng)确性和(he)精度的(de)可靠性。

(2)在被切(qie)割(ge)部(bu)分与母体(ti)材料之间填充(chong)导(dao)(dao)电(dian)铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)。把(ba)经(jing)折叠、剪(jian)齐、锤(chui)平(ping)和修锉的(de)(de)(de)薄铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)填充(chong)在线电(dian)极(ji)加工形(xing)成(cheng)的(de)(de)(de)缝隙(xi)里,并使铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)和缝隙(xi)壁紧密(mi)贴合。填充(chong)此铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)的(de)(de)(de)目(mu)的(de)(de)(de)是为(wei)(wei)了(le)导(dao)(dao)电(dian),因为(wei)(wei)前面(mian)粘贴连接铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)时(shi)用了(le)502胶水(shui),而502胶水(shui)是不(bu)导(dao)(dao)电(dian)的(de)(de)(de)。为(wei)(wei)了(le)实现导(dao)(dao)电(dian)要求,故采用填充(chong)导(dao)(dao)电(dian)铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)的(de)(de)(de)方法,填充(chong)导(dao)(dao)电(dian)铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)时(shi)同样应注(zhu)意铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)的(de)(de)(de)对称布(bu)置以(yi)及铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)应同时(shi)加紧,并且(qie)不(bu)能塞得过紧以(yi)免划(hua)伤工件的(de)(de)(de)表面(mian)。不(bu)管是粘贴连接铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)还是填充(chong)导(dao)(dao)电(dian)铜(tong)(tong)(tong)缝隙(xi)的(de)(de)(de)形(xing)状。都(dou)应该(gai)把(ba)小铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)制成(cheng)圆(yuan)弧形(xing),而且(qie)还应该(gai)用金相砂布(bu)打磨被锤(chui)过的(de)(de)(de)铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)表面(mian),以(yi)保证铜(tong)(tong)(tong)片(pian)(pian)(pian)(pian)(pian)表面(mian)光滑以(yi)避免划(hua)伤工件已加工过的(de)(de)(de)表面(mian)。

在采(cai)用(yong)电(dian)火花线切(qie)割(ge)机加(jia)工(gong)高(gao)硬度(du)、高(gao)精度(du)和(he)高(gao)复杂度(du)的小型工(gong)件时,按(an)照(zhao)上述方法(fa)和(he)步(bu)(bu)骤(zhou)进行(xing)线切(qie)割(ge)加(jia)工(gong)中工(gong)件余留部位(wei)的精密切(qie)割(ge),是一种行(xing)之有效的方法(fa),它所提(ti)出的步(bu)(bu)骤(zhou)和(he)技巧(qiao),经(jing)济简便、实用(yong)可行(xing),从而(er)为改(gai)善和(he)提(ti)高(gao)精密线切(qie)割(ge)加(jia)工(gong)的质量和(he)效率探索出新的途径。


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