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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://young-lady.cn 点击:

对(dui)于线切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)工(gong)(gong)(gong)件(jian)余(yu)留(liu)(liu)部(bu)位切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)的(de)(de)(de)多(duo)次(ci)(ci)加(jia)工(gong)(gong)(gong),首(shou)先必须解决被加(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件(jian)的(de)(de)(de)导(dao)电(dian)问题,因为在高精(jing)度(du)线切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)加(jia)工(gong)(gong)(gong)中,线电(dian)极的(de)(de)(de)行(xing)走(zou)路线可能需要沿(yan)加(jia)工(gong)(gong)(gong)轨迹往复(fu)行(xing)走(zou)多(duo)次(ci)(ci),才(cai)能保证被加(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件(jian)具有(you)较高表面粗糙度(du)和表面精(jing)度(du),这时线切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)加(jia)工(gong)(gong)(gong)是靠工(gong)(gong)(gong)件(jian)余(yu)留(liu)(liu)部(bu)位起(qi)到(dao)导(dao)电(dian)作用(yong)以(yi)保障(zhang)电(dian)加(jia)工(gong)(gong)(gong)正(zheng)常(chang)进(jin)行(xing)。但在进(jin)行(xing)工(gong)(gong)(gong)件(jian)余(yu)留(liu)(liu)部(bu)位的(de)(de)(de)切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)加(jia)工(gong)(gong)(gong)时,若(ruo)第一(yi)次(ci)(ci)切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)即切(qie)(qie)(qie)下(xia)工(gong)(gong)(gong)件(jian)余(yu)留(liu)(liu)部(bu)位,将会导(dao)致被切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)部(bu)分与(yu)母体分离,以(yi)致导(dao)电(dian)回路中断,无法进(jin)行(xing)继续(xu)加(jia)工(gong)(gong)(gong),所以(yi)从(cong)线切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)加(jia)工(gong)(gong)(gong)的(de)(de)(de)条件(jian)性和延续(xu)性考虑,必须使(shi)工(gong)(gong)(gong)件(jian)余(yu)留(liu)(liu)部(bu)位即便在多(duo)次(ci)(ci)切(qie)(qie)(qie)割(ge)(ge)(ge)(ge)的(de)(de)(de)情(qing)况下(xia)也能保持与(yu)母体之间正(zheng)常(chang)导(dao)电(dian)的(de)(de)(de)要求。

为(wei)了实(shi)现上述目的(de),操(cao)作工(gong)(gong)人力图营造(zao)人为(wei)环境和(he)(he)条件(jian)(jian)来满足导电要(yao)求,即(ji)当工(gong)(gong)作人员在(zai)操(cao)作电火(huo)花线切(qie)(qie)割(ge)(ge)机遇到(dao)切(qie)(qie)割(ge)(ge)工(gong)(gong)件(jian)(jian)余留部位时(shi),可采用在(zai)被(bei)切(qie)(qie)割(ge)(ge)部分和(he)(he)母体(ti)之间(jian)粘铜片(pian)和(he)(he)在(zai)切(qie)(qie)割(ge)(ge)间(jian)隙(xi)中塞铜片(pian)的(de)处理方法来造(zao)成人为(wei)的(de)定位条件(jian)(jian)和(he)(he)导电条件(jian)(jian),使是火(huo)花加工(gong)(gong)得以继续(xu)进行,其具体(ti)做法与(yu)技巧如(ru)下:

(1)在被切(qie)割(ge)部分(fen)与母(mu)体材(cai)料之间粘贴(tie)连接铜片。其目(mu)的(de)(de)是使(shi)工件余留部分(fen)在切(qie)割(ge)时与母(mu)体材(cai)料相(xiang)连固定,保证线切(qie)割(ge)有良好(hao)的(de)(de)定位条件,从而保障工件有优异的(de)(de)加工质量,这可依照以下步骤进行:

①首先根(gen)(gen)据(ju)加工工件(jian)的大小把薄铜(tong)片(厚度根(gen)(gen)据(ju)线电极情况和加工部位(wei)形状(zhuang)而定)剪成长条形,然后折(zhe)叠,井保证折(zhe)叠部分一(yi)长一(yi)短。

②然后把(ba)铜(tong)片折叠的弯曲(qu)部分用(yong)小手锤锤平(ping),并用(yong)什锦锉修理成楔(xie)形;

③再把经(jing)以上处理的(de)铜片塞(sai)到线电(dian)极加工所(suo)形成的(de)缝(feng)隙里,同(tong)时在工件该部分的(de)表面滴上502胶(jiao)水(即(ji)环(huan)氧树脂瞬时快干胶(jiao))。

由于切(qie)割(ge)时,电火花线切(qie)割(ge)机冲水(shui)使工(gong)(gong)件所(suo)受压力较(jiao)大,若单纯用铜(tong)片塞紧来保(bao)证导(dao)电和固定,容易(yi)产生以下问(wen)题(ti):(a)铜(tong)片塞得太松,担心固定不可靠、导(dao)电不稳定;(b)铜(tong)片塞得太紧,又担心损伤工(gong)(gong)件表面、破坏形(xing)位公差,所(suo)以采(cai)用502胶水(shui)来保(bao)证被(bei)切(qie)割(ge)部分与母体材料固定;

④在将(jiang)铜片(pian)塞进加工(gong)部位(wei)(wei)时(shi),应(ying)注意(yi)是:用502胶水粘贴(tie)(tie)连(lian)接(jie)铜片(pian)时(shi)应(ying)远离工(gong)件余留部件处,以(yi)(yi)免502胶水渗到,造成绝缘(yuan)。此外粘贴(tie)(tie)连(lian)接(jie)铜片(pian)的(de)位(wei)(wei)置应(ying)考虑(lv)对称(cheng)分布,且应(ying)保(bao)(bao)证同(tong)时(shi)塞紧(jin),避免工(gong)件发生偏移(yi),以(yi)(yi)致影(ying)响工(gong)件加工(gong)质量。保(bao)(bao)证被切割工(gong)件余留部位(wei)(wei)形状的(de)正确性和精度的(de)可(ke)靠性。

(2)在被切割(ge)部分与(yu)母体材(cai)料之间(jian)填充(chong)导(dao)(dao)电(dian)(dian)(dian)(dian)铜(tong)(tong)(tong)(tong)片(pian)。把经折叠、剪齐、锤平(ping)和修锉(cuo)的(de)薄铜(tong)(tong)(tong)(tong)片(pian)填充(chong)在线电(dian)(dian)(dian)(dian)极加工(gong)形成的(de)缝隙里,并使铜(tong)(tong)(tong)(tong)片(pian)和缝隙壁紧密贴合。填充(chong)此铜(tong)(tong)(tong)(tong)片(pian)的(de)目的(de)是(shi)(shi)为了(le)导(dao)(dao)电(dian)(dian)(dian)(dian),因(yin)为前面(mian)(mian)(mian)粘(zhan)贴连接铜(tong)(tong)(tong)(tong)片(pian)时(shi)用了(le)502胶(jiao)水(shui)(shui),而502胶(jiao)水(shui)(shui)是(shi)(shi)不导(dao)(dao)电(dian)(dian)(dian)(dian)的(de)。为了(le)实现导(dao)(dao)电(dian)(dian)(dian)(dian)要求,故采用填充(chong)导(dao)(dao)电(dian)(dian)(dian)(dian)铜(tong)(tong)(tong)(tong)片(pian)的(de)方法,填充(chong)导(dao)(dao)电(dian)(dian)(dian)(dian)铜(tong)(tong)(tong)(tong)片(pian)时(shi)同(tong)样(yang)应(ying)(ying)注意铜(tong)(tong)(tong)(tong)片(pian)的(de)对称布(bu)置以及铜(tong)(tong)(tong)(tong)片(pian)应(ying)(ying)同(tong)时(shi)加紧,并且不能塞得过(guo)紧以免(mian)划伤工(gong)件的(de)表(biao)(biao)面(mian)(mian)(mian)。不管是(shi)(shi)粘(zhan)贴连接铜(tong)(tong)(tong)(tong)片(pian)还是(shi)(shi)填充(chong)导(dao)(dao)电(dian)(dian)(dian)(dian)铜(tong)(tong)(tong)(tong)缝隙的(de)形状。都应(ying)(ying)该把小铜(tong)(tong)(tong)(tong)片(pian)制(zhi)成圆(yuan)弧形,而且还应(ying)(ying)该用金相砂(sha)布(bu)打磨(mo)被锤过(guo)的(de)铜(tong)(tong)(tong)(tong)片(pian)表(biao)(biao)面(mian)(mian)(mian),以保证铜(tong)(tong)(tong)(tong)片(pian)表(biao)(biao)面(mian)(mian)(mian)光(guang)滑以避免(mian)划伤工(gong)件已加工(gong)过(guo)的(de)表(biao)(biao)面(mian)(mian)(mian)。

在(zai)采用电火花线(xian)切割机加工(gong)(gong)高(gao)硬度(du)、高(gao)精(jing)度(du)和高(gao)复杂度(du)的(de)(de)小(xiao)型工(gong)(gong)件(jian)时,按照上述方(fang)法和步(bu)骤进行线(xian)切割加工(gong)(gong)中工(gong)(gong)件(jian)余留部位的(de)(de)精(jing)密(mi)切割,是一种行之有效(xiao)的(de)(de)方(fang)法,它所(suo)提(ti)出(chu)的(de)(de)步(bu)骤和技巧,经济(ji)简便、实用可行,从而(er)为改善和提(ti)高(gao)精(jing)密(mi)线(xian)切割加工(gong)(gong)的(de)(de)质量(liang)和效(xiao)率(lv)探索(suo)出(chu)新(xin)的(de)(de)途(tu)径。


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