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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://sanhecar.cn 点击:

对于线(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)工(gong)(gong)(gong)(gong)件(jian)(jian)余(yu)留(liu)部(bu)位切(qie)(qie)(qie)割(ge)(ge)的(de)多次(ci)加(jia)(jia)工(gong)(gong)(gong)(gong),首先必须解(jie)决被加(jia)(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)(jian)的(de)导电问(wen)题(ti),因(yin)为(wei)在(zai)高精度线(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)(gong)中(zhong),线(xian)(xian)(xian)电极的(de)行(xing)走(zou)路线(xian)(xian)(xian)可能需要沿加(jia)(jia)工(gong)(gong)(gong)(gong)轨迹(ji)往(wang)复行(xing)走(zou)多次(ci),才能保(bao)证被加(jia)(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)(jian)具(ju)有较高表(biao)面(mian)粗糙度和表(biao)面(mian)精度,这(zhei)时线(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)(gong)是靠(kao)工(gong)(gong)(gong)(gong)件(jian)(jian)余(yu)留(liu)部(bu)位起(qi)到(dao)导电作用(yong)以(yi)保(bao)障电加(jia)(jia)工(gong)(gong)(gong)(gong)正常进(jin)行(xing)。但在(zai)进(jin)行(xing)工(gong)(gong)(gong)(gong)件(jian)(jian)余(yu)留(liu)部(bu)位的(de)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)(gong)时,若第一次(ci)切(qie)(qie)(qie)割(ge)(ge)即切(qie)(qie)(qie)下工(gong)(gong)(gong)(gong)件(jian)(jian)余(yu)留(liu)部(bu)位,将会导致被切(qie)(qie)(qie)割(ge)(ge)部(bu)分与(yu)母(mu)体分离,以(yi)致导电回路中(zhong)断(duan),无(wu)法进(jin)行(xing)继(ji)续(xu)加(jia)(jia)工(gong)(gong)(gong)(gong),所以(yi)从线(xian)(xian)(xian)切(qie)(qie)(qie)割(ge)(ge)加(jia)(jia)工(gong)(gong)(gong)(gong)的(de)条件(jian)(jian)性(xing)(xing)和延续(xu)性(xing)(xing)考虑(lv),必须使工(gong)(gong)(gong)(gong)件(jian)(jian)余(yu)留(liu)部(bu)位即便在(zai)多次(ci)切(qie)(qie)(qie)割(ge)(ge)的(de)情(qing)况下也能保(bao)持与(yu)母(mu)体之间正常导电的(de)要求。

为(wei)(wei)了实现上述目的,操作(zuo)工人力图营造(zao)人为(wei)(wei)环境和(he)条(tiao)(tiao)件来满足导电(dian)(dian)要求(qiu),即当(dang)工作(zuo)人员在操作(zuo)电(dian)(dian)火花线切(qie)割(ge)机遇到切(qie)割(ge)工件余留部(bu)位(wei)时,可采用在被切(qie)割(ge)部(bu)分和(he)母体之间粘铜(tong)片和(he)在切(qie)割(ge)间隙中塞铜(tong)片的处理方法(fa)来造(zao)成人为(wei)(wei)的定位(wei)条(tiao)(tiao)件和(he)导电(dian)(dian)条(tiao)(tiao)件,使是(shi)火花加工得以继(ji)续(xu)进行(xing),其具体做法(fa)与技巧如(ru)下:

(1)在被切割部(bu)分与(yu)母体材(cai)料(liao)(liao)之(zhi)间粘贴连(lian)(lian)接铜片(pian)。其目的(de)是使工件(jian)余留部(bu)分在切割时(shi)与(yu)母体材(cai)料(liao)(liao)相连(lian)(lian)固定,保(bao)证线(xian)切割有(you)良(liang)好的(de)定位条件(jian),从而(er)保(bao)障工件(jian)有(you)优异的(de)加工质量,这可依照以下(xia)步(bu)骤进行:

①首先(xian)根据加工工件的大小把薄铜片(厚度根据线(xian)电极(ji)情况(kuang)和(he)加工部(bu)位(wei)形状而定)剪(jian)成(cheng)长条形,然(ran)后折(zhe)(zhe)叠(die),井(jing)保证折(zhe)(zhe)叠(die)部(bu)分(fen)一长一短(duan)。

②然后把铜片折叠的弯曲部分用小手锤锤平,并用什锦锉(cuo)修理成楔形;

③再把经以上处(chu)理的(de)铜片塞到线电极加(jia)工(gong)所(suo)形成的(de)缝隙(xi)里,同时(shi)在(zai)工(gong)件该部分的(de)表面滴上502胶水(即环氧树脂瞬(shun)时(shi)快干(gan)胶)。

由于切割(ge)(ge)时,电火花(hua)线切割(ge)(ge)机冲水(shui)使工(gong)(gong)件(jian)所受(shou)压(ya)力(li)较(jiao)大,若单(dan)纯用铜片塞(sai)紧(jin)来(lai)保证导电和固(gu)定(ding)(ding),容易产生(sheng)以(yi)下问题:(a)铜片塞(sai)得(de)太(tai)松,担心固(gu)定(ding)(ding)不(bu)可(ke)靠(kao)、导电不(bu)稳定(ding)(ding);(b)铜片塞(sai)得(de)太(tai)紧(jin),又担心损伤工(gong)(gong)件(jian)表面、破坏(huai)形位公(gong)差,所以(yi)采用502胶水(shui)来(lai)保证被切割(ge)(ge)部分(fen)与母体材(cai)料(liao)固(gu)定(ding)(ding);

④在将铜(tong)片(pian)塞进加工部(bu)位时(shi),应注意是:用502胶(jiao)水(shui)粘贴连接铜(tong)片(pian)时(shi)应远(yuan)离工件余留部(bu)件处,以免502胶(jiao)水(shui)渗到,造成绝(jue)缘。此外(wai)粘贴连接铜(tong)片(pian)的(de)位置应考虑(lv)对(dui)称分布(bu),且应保证(zheng)同(tong)时(shi)塞紧,避免工件发生(sheng)偏移,以致影响工件加工质量。保证(zheng)被(bei)切(qie)割(ge)工件余留部(bu)位形状(zhuang)的(de)正(zheng)确性(xing)(xing)和精度的(de)可(ke)靠(kao)性(xing)(xing)。

(2)在(zai)被切割部分(fen)与母(mu)体材料之间填(tian)(tian)(tian)充(chong)导(dao)电(dian)(dian)(dian)(dian)铜片(pian)。把经折叠、剪(jian)齐、锤平和修(xiu)锉(cuo)的(de)薄铜片(pian)填(tian)(tian)(tian)充(chong)在(zai)线电(dian)(dian)(dian)(dian)极(ji)加(jia)工(gong)(gong)形成的(de)缝(feng)隙里,并使铜片(pian)和缝(feng)隙壁紧(jin)(jin)密贴(tie)合。填(tian)(tian)(tian)充(chong)此(ci)铜片(pian)的(de)目(mu)的(de)是(shi)为(wei)了(le)导(dao)电(dian)(dian)(dian)(dian),因为(wei)前面粘贴(tie)连(lian)接(jie)铜片(pian)时用了(le)502胶水(shui),而(er)502胶水(shui)是(shi)不(bu)导(dao)电(dian)(dian)(dian)(dian)的(de)。为(wei)了(le)实现(xian)导(dao)电(dian)(dian)(dian)(dian)要求,故(gu)采用填(tian)(tian)(tian)充(chong)导(dao)电(dian)(dian)(dian)(dian)铜片(pian)的(de)方法,填(tian)(tian)(tian)充(chong)导(dao)电(dian)(dian)(dian)(dian)铜片(pian)时同(tong)(tong)样(yang)应(ying)注(zhu)意铜片(pian)的(de)对称(cheng)布置以(yi)及铜片(pian)应(ying)同(tong)(tong)时加(jia)紧(jin)(jin),并且不(bu)能塞得过紧(jin)(jin)以(yi)免划伤工(gong)(gong)件(jian)的(de)表(biao)面。不(bu)管是(shi)粘贴(tie)连(lian)接(jie)铜片(pian)还是(shi)填(tian)(tian)(tian)充(chong)导(dao)电(dian)(dian)(dian)(dian)铜缝(feng)隙的(de)形状。都(dou)应(ying)该把小铜片(pian)制(zhi)成圆弧(hu)形,而(er)且还应(ying)该用金相砂布打磨(mo)被锤过的(de)铜片(pian)表(biao)面,以(yi)保证铜片(pian)表(biao)面光滑(hua)以(yi)避免划伤工(gong)(gong)件(jian)已加(jia)工(gong)(gong)过的(de)表(biao)面。

在采用(yong)电火花线切(qie)割(ge)机加工高(gao)硬度、高(gao)精度和高(gao)复杂度的(de)(de)(de)(de)小型工件时(shi),按(an)照上述方法和步骤进行线切(qie)割(ge)加工中工件余留部(bu)位的(de)(de)(de)(de)精密切(qie)割(ge),是(shi)一种行之有(you)效(xiao)的(de)(de)(de)(de)方法,它所提出的(de)(de)(de)(de)步骤和技巧,经济(ji)简(jian)便、实(shi)用(yong)可行,从而为改善(shan)和提高(gao)精密线切(qie)割(ge)加工的(de)(de)(de)(de)质(zhi)量和效(xiao)率(lv)探索(suo)出新的(de)(de)(de)(de)途径。


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