塑(su)胶模具加工(gong)方法(fa)是多种(zhong)多样(yang)的(de),下(xia)面(mian)我(wo)们来(lai)分析一下(xia)有关电(dian)(dian)火花成(cheng)形加工(gong)方法(fa)知识(shi)。电(dian)(dian)火花成(cheng)形加工(gong)主(zhu)要(yao)是利用在工(gong)具和工(gong)件(正、负(fu)电(dian)(dian)极)之间产生(sheng)脉冲性火花放(fang)电(dian)(dian)时的(de)电(dian)(dian)腐蚀现象来(lai)蚀除多余的(de)金(jin)属,以达到零件技术要(yao)求(qiu)所规定(ding)的(de)尺寸、形状及(ji)表面(mian)质量。

1、塑(su)胶模具(ju)电火花成形(xing)加工方法必(bi)须(xu)满(man)足三大条(tiao)件:

①必(bi)(bi)须(xu)(xu)使工(gong)具(ju)(ju)电(dian)(dian)(dian)极和工(gong)件被加工(gong)表(biao)面(mian)之间(jian)(jian)保持一定的间(jian)(jian)隙,因(yin)此在(zai)电(dian)(dian)(dian)火(huo)花加工(gong)中必(bi)(bi)须(xu)(xu)具(ju)(ju)有工(gong)具(ju)(ju)电(dian)(dian)(dian)极的自动进给和调(diao)节装(zhuang)置;

②火(huo)花放电(dian)必(bi)须是瞬(shun)时的(de)脉(mai)冲(chong)性放电(dian),为此电(dian)火(huo)花加(jia)工必(bi)须使用脉(mai)冲(chong)电(dian)源;

③火花放(fang)电必须(xu)在(zai)有一定绝缘性能的液(ye)体(ti)介(jie)质中进行。

2、影响(xiang)电(dian)火花成形蚀除(chu)速率(lv)的因素:电(dian)规准、极性效(xiao)应、金属材料的热学常数、工(gong)作(zuo)液、排(pai)屑(xie)条件。

3、影(ying)响电(dian)火花成(cheng)形(xing)加工(gong)(gong)精度的(de)因素:机床本身的(de)各种误差、工(gong)(gong)具电(dian)极制造精度、工(gong)(gong)件和电(dian)极的(de)定位及安装(zhuang)误差、放电(dian)间(jian)隙的(de)大小和一致性(xing)、工(gong)(gong)件电(dian)极的(de)损耗及其加工(gong)(gong)稳定性(xing)。

4、电火花加(jia)工(gong)(gong)的(de)电极材(cai)料(liao)要求(qiu):损耗小(xiao)、加(jia)工(gong)(gong)过程稳定(ding)、生产率高、机(ji)械加(jia)工(gong)(gong)性能好(hao)、价格(ge)低廉。常用材(cai)料(liao):紫铜、石墨(mo)、铸铁、钢、黄铜、同钨(wu)合金、银钨(wu)合金。结构形(xing)式:①整体式电(dian)极(ji)②镶拼式(shi)电极③组(zu)合电极(ji)。

5、电火花成形(xing)加工型腔模的方法(fa):①单电(dian)极平动法②多电极更换法③分解电极法。