粉末(mo)注射成形(xing)加工原(yuan)理

金属粉未注(zhu)射成型(xing)(xing)技(ji)术(Metal Powder IniectionMolding Technology，简称MIM)是将(jiang)现代塑(su)料注(zhu)射成型(xing)(xing)技(ji)术引入粉末(mo)(mo)治金领(ling)域而(er)形(xing)(xing)成的一门(men)新型(xing)(xing)粉末(mo)(mo)治金近净(jing)形(xing)(xing)成型(xing)(xing)技(ji)术

其基本(ben)工艺过程是:首先将固体粉末与(yu)有(you)机粘结剂均匀混练，经制粒后在加(jia)热塑(su)化状态下(~150C)用注射成(cheng)形机注入模腔内固化成(cheng)形，然后用化学或(huo)热分解的方(fang)法(fa)将成(cheng)形还(hai)中的粘结剂脱(tuo)除，最后经烧结致密(mi)化得到最终(zhong)。

粉末注射成(cheng)形(xing)加工技术特(te)点

粉(fen)(fen)末注(zhu)(zhu)射(she)成(cheng)(cheng)(cheng)型技(ji)术(shu)是集(ji)塑料(liao)(liao)成(cheng)(cheng)(cheng)型工(gong)(gong)(gong)(gong)艺(yi)(yi)学(xue)(xue)(xue)、高(gao)(gao)分子化学(xue)(xue)(xue)、粉(fen)(fen)末冶(ye)金工(gong)(gong)(gong)(gong)艺(yi)(yi)学(xue)(xue)(xue)和金属材(cai)料(liao)(liao)学(xue)(xue)(xue)等多(duo)(duo)学(xue)(xue)(xue)科透与交叉(cha)的(de)(de)(de)产物，利用模具(ju)(ju)(ju)可注(zhu)(zhu)射(she)成(cheng)(cheng)(cheng)型坯(pi)件(jian)并通过(guo)烧结快速制(zhi)造高(gao)(gao)密度、高(gao)(gao)精(jing)度、三维复杂(za)形状的(de)(de)(de)结构(gou)零件(jian)，能(neng)够快速准确地将设计思想物化为具(ju)(ju)(ju)有一定结构(gou)、功(gong)能(neng)特性(xing)(xing)的(de)(de)(de)制(zhi)品(pin)，并可直接批量生产出零件(jian)，是制(zhi)造技(ji)术(shu)行业一次新(xin)的(de)(de)(de)变革(ge)。该工(gong)(gong)(gong)(gong)艺(yi)(yi)技(ji)术(shu)不仅具(ju)(ju)(ju)有常规粉(fen)(fen)末冶(ye)金工(gong)(gong)(gong)(gong)艺(yi)(yi)工(gong)(gong)(gong)(gong)序少、无切削(xue)或少切削(xue)、经济(ji)效益(yi)高(gao)(gao)等优点，而且克服了传统粉(fen)(fen)末冶(ye)金工(gong)(gong)(gong)(gong)艺(yi)(yi)制(zhi)品(pin)、材(cai)质(zhi)不均(jun)匀、机械性(xing)(xing)能(neng)低、不易成(cheng)(cheng)(cheng)型薄壁、复杂(za)结构(gou)的(de)(de)(de)缺点，特别适合于大批量生产小型、复杂(za)以及具(ju)(ju)(ju)有特殊(shu)(shu)要求(qiu)的(de)(de)(de)金属零件(jian)。工(gong)(gong)(gong)(gong)艺(yi)(yi)流程粘(zhan)结剂+ 混(hun)炼+注(zhu)(zhu)射(she)成(cheng)(cheng)(cheng)形+脱脂(zhi)+烧结+后处理该技(ji)术(shu)还可以将多(duo)(duo)种金属和非(fei)金属材(cai)料(liao)(liao)混(hun)合成(cheng)(cheng)(cheng)形，烧制(zhi)出具(ju)(ju)(ju)有特殊(shu)(shu)功(gong)能(neng)的(de)(de)(de)复合材(cai)料(liao)(liao)零件(jian)。