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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://sh-yongzheng.com.cn 点击:

对于(yu)线(xian)(xian)切(qie)割(ge)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)余留(liu)部(bu)位(wei)(wei)(wei)切(qie)割(ge)的(de)(de)(de)多次(ci)加(jia)工(gong)(gong)(gong)(gong),首(shou)先必须解决(jue)被加(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)的(de)(de)(de)导(dao)电(dian)问题,因为在(zai)高精(jing)度线(xian)(xian)切(qie)割(ge)加(jia)工(gong)(gong)(gong)(gong)中,线(xian)(xian)电(dian)极的(de)(de)(de)行(xing)(xing)走(zou)路线(xian)(xian)可能需要沿加(jia)工(gong)(gong)(gong)(gong)轨迹往复(fu)行(xing)(xing)走(zou)多次(ci),才(cai)能保(bao)证被加(jia)工(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)具有较高表(biao)面(mian)粗糙度和(he)表(biao)面(mian)精(jing)度,这(zhei)时线(xian)(xian)切(qie)割(ge)加(jia)工(gong)(gong)(gong)(gong)是靠工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)余留(liu)部(bu)位(wei)(wei)(wei)起到导(dao)电(dian)作用(yong)以(yi)保(bao)障电(dian)加(jia)工(gong)(gong)(gong)(gong)正常进(jin)行(xing)(xing)。但在(zai)进(jin)行(xing)(xing)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)余留(liu)部(bu)位(wei)(wei)(wei)的(de)(de)(de)切(qie)割(ge)加(jia)工(gong)(gong)(gong)(gong)时,若第一次(ci)切(qie)割(ge)即切(qie)下工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)余留(liu)部(bu)位(wei)(wei)(wei),将会导(dao)致被切(qie)割(ge)部(bu)分与(yu)母体(ti)分离,以(yi)致导(dao)电(dian)回(hui)路中断,无(wu)法进(jin)行(xing)(xing)继续加(jia)工(gong)(gong)(gong)(gong),所以(yi)从线(xian)(xian)切(qie)割(ge)加(jia)工(gong)(gong)(gong)(gong)的(de)(de)(de)条件(jian)(jian)(jian)性(xing)和(he)延续性(xing)考虑,必须使(shi)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)余留(liu)部(bu)位(wei)(wei)(wei)即便在(zai)多次(ci)切(qie)割(ge)的(de)(de)(de)情(qing)况下也能保(bao)持与(yu)母体(ti)之间正常导(dao)电(dian)的(de)(de)(de)要求。

为了实现上述目的,操(cao)作工人力图营(ying)造人为环境和(he)条(tiao)件(jian)(jian)来(lai)满足导(dao)电要求,即当工作人员(yuan)在(zai)操(cao)作电火花(hua)(hua)线切(qie)割机(ji)遇到切(qie)割工件(jian)(jian)余留部位时,可采(cai)用(yong)在(zai)被切(qie)割部分和(he)母体(ti)之(zhi)间(jian)粘铜片(pian)和(he)在(zai)切(qie)割间(jian)隙中(zhong)塞铜片(pian)的处理方法来(lai)造成(cheng)人为的定位条(tiao)件(jian)(jian)和(he)导(dao)电条(tiao)件(jian)(jian),使(shi)是火花(hua)(hua)加工得以继续进行,其(qi)具(ju)体(ti)做法与技(ji)巧如下:

(1)在被切割(ge)(ge)部分与(yu)母体(ti)材(cai)料之间粘贴连接铜片。其目(mu)的(de)是使工(gong)(gong)件(jian)余留部分在切割(ge)(ge)时与(yu)母体(ti)材(cai)料相连固定(ding)(ding),保(bao)证线切割(ge)(ge)有(you)(you)良好的(de)定(ding)(ding)位条件(jian),从(cong)而(er)保(bao)障工(gong)(gong)件(jian)有(you)(you)优异的(de)加工(gong)(gong)质量,这可依照(zhao)以下步骤(zhou)进行:

①首先(xian)根据加工工件的大小(xiao)把薄铜片(厚度(du)根据线电极情况(kuang)和加工部(bu)(bu)位形状而定)剪(jian)成长条形,然后折(zhe)叠,井保证(zheng)折(zhe)叠部(bu)(bu)分一长一短。

②然后(hou)把铜片折叠的(de)弯曲(qu)部分用(yong)小手锤锤平,并用(yong)什锦锉修理成楔形;

③再把经以上(shang)处(chu)理(li)的铜片塞到线电极加工所形成的缝(feng)隙里,同(tong)时在(zai)工件(jian)该部(bu)分的表面滴上(shang)502胶水(即环氧(yang)树脂瞬时快干胶)。

由于切割时(shi),电(dian)(dian)火(huo)花(hua)线切割机(ji)冲(chong)水(shui)(shui)使工(gong)件(jian)所(suo)受压力较(jiao)大,若(ruo)单纯(chun)用(yong)铜(tong)片塞紧(jin)来(lai)保证导电(dian)(dian)和固定(ding),容(rong)易(yi)产生以下问题:(a)铜(tong)片塞得太松,担心固定(ding)不可靠、导电(dian)(dian)不稳定(ding);(b)铜(tong)片塞得太紧(jin),又担心损伤工(gong)件(jian)表面、破坏形位公差(cha),所(suo)以采用(yong)502胶水(shui)(shui)来(lai)保证被切割部分(fen)与母体材料(liao)固定(ding);

④在将铜片(pian)塞进(jin)加工(gong)部(bu)位(wei)(wei)时(shi)(shi),应(ying)(ying)注意(yi)是:用(yong)502胶水(shui)粘贴连接铜片(pian)时(shi)(shi)应(ying)(ying)远离工(gong)件余留部(bu)件处,以免502胶水(shui)渗到,造成绝(jue)缘。此外粘贴连接铜片(pian)的位(wei)(wei)置(zhi)应(ying)(ying)考虑(lv)对(dui)称分布,且应(ying)(ying)保证同(tong)时(shi)(shi)塞紧,避免工(gong)件发生偏移,以致影响(xiang)工(gong)件加工(gong)质(zhi)量。保证被切割工(gong)件余留部(bu)位(wei)(wei)形状的正确(que)性和(he)精(jing)度的可靠(kao)性。

(2)在被切割部分(fen)与母体(ti)材料之间填(tian)(tian)(tian)充导电(dian)(dian)(dian)(dian)铜(tong)片(pian)(pian)。把经折叠、剪齐、锤(chui)平和(he)修锉的(de)(de)(de)(de)薄铜(tong)片(pian)(pian)填(tian)(tian)(tian)充在线电(dian)(dian)(dian)(dian)极加(jia)工形成的(de)(de)(de)(de)缝隙里,并使铜(tong)片(pian)(pian)和(he)缝隙壁(bi)紧(jin)密贴合。填(tian)(tian)(tian)充此铜(tong)片(pian)(pian)的(de)(de)(de)(de)目的(de)(de)(de)(de)是(shi)(shi)为了(le)导电(dian)(dian)(dian)(dian),因为前面粘贴连接(jie)铜(tong)片(pian)(pian)时(shi)用(yong)了(le)502胶水,而502胶水是(shi)(shi)不(bu)导电(dian)(dian)(dian)(dian)的(de)(de)(de)(de)。为了(le)实现导电(dian)(dian)(dian)(dian)要求,故(gu)采(cai)用(yong)填(tian)(tian)(tian)充导电(dian)(dian)(dian)(dian)铜(tong)片(pian)(pian)的(de)(de)(de)(de)方(fang)法,填(tian)(tian)(tian)充导电(dian)(dian)(dian)(dian)铜(tong)片(pian)(pian)时(shi)同(tong)样应注意(yi)铜(tong)片(pian)(pian)的(de)(de)(de)(de)对称布(bu)置以(yi)及铜(tong)片(pian)(pian)应同(tong)时(shi)加(jia)紧(jin),并且不(bu)能塞得过紧(jin)以(yi)免划伤(shang)工件(jian)(jian)的(de)(de)(de)(de)表面。不(bu)管是(shi)(shi)粘贴连接(jie)铜(tong)片(pian)(pian)还(hai)是(shi)(shi)填(tian)(tian)(tian)充导电(dian)(dian)(dian)(dian)铜(tong)缝隙的(de)(de)(de)(de)形状。都应该把小铜(tong)片(pian)(pian)制成圆弧形,而且还(hai)应该用(yong)金相砂布(bu)打磨被锤(chui)过的(de)(de)(de)(de)铜(tong)片(pian)(pian)表面,以(yi)保证铜(tong)片(pian)(pian)表面光滑以(yi)避免划伤(shang)工件(jian)(jian)已加(jia)工过的(de)(de)(de)(de)表面。

在采用电(dian)火花线切(qie)(qie)割(ge)机加工高(gao)硬(ying)度(du)、高(gao)精(jing)度(du)和(he)(he)高(gao)复(fu)杂度(du)的(de)小型工件(jian)时,按照上(shang)述方(fang)法(fa)和(he)(he)步骤(zhou)进行线切(qie)(qie)割(ge)加工中工件(jian)余留部位的(de)精(jing)密切(qie)(qie)割(ge),是一种行之有效的(de)方(fang)法(fa),它所(suo)提(ti)出的(de)步骤(zhou)和(he)(he)技(ji)巧,经济简便(bian)、实用可行,从而为改善和(he)(he)提(ti)高(gao)精(jing)密线切(qie)(qie)割(ge)加工的(de)质量(liang)和(he)(he)效率探索出新的(de)途径。


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