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燒結型金屬結合劑砂輪多以青銅等金屬作為結合劑,用高溫燒結法制造,其結合強度高,成型性好,耐高溫,導熱性和耐磨性好, 使用壽命長,可承受較大的負荷.因砂輪在燒結過程中不可避免地存在著收縮及變形,所以在使用前 須對砂輪進行整形,但砂輪修 整比較困難.目前生產中常用的砂輪對滾整形方法不僅在修整時費時費力,而且修整過程中金剛石顆粒的脫落較多,修整砂輪本身的消耗很大,整形精度較低.
近(jin)年(nian)來各國學者相(xiang)繼開展(zhan)了應用特種加(jia)工(gong)(gong)方法修(xiu)(xiu)(xiu)整(zheng)(zheng)(zheng)金(jin)屬結合(he)(he)劑金(jin)剛石(shi)砂輪的研究(jiu)工(gong)(gong)作,主要有電(dian)(dian)解(jie)修(xiu)(xiu)(xiu)整(zheng)(zheng)(zheng)法,電(dian)(dian)火花修(xiu)(xiu)(xiu)整(zheng)(zheng)(zheng)法 和復(fu)(fu)合(he)(he)修(xiu)(xiu)(xiu)整(zheng)(zheng)(zheng)法等.電(dian)(dian)解(jie)修(xiu)(xiu)(xiu)整(zheng)(zheng)(zheng)法速度(du)(du)快,整(zheng)(zheng)(zheng)形(xing)(xing)精度(du)(du)高(gao);電(dian)(dian)火花修(xiu)(xiu)(xiu)整(zheng)(zheng)(zheng)法整(zheng)(zheng)(zheng)形(xing)(xing)精度(du)(du)高(gao),既可整(zheng)(zheng)(zheng)形(xing)(xing)又可修(xiu)(xiu)(xiu)銳,但整(zheng)(zheng)(zheng)形(xing)(xing)速度(du)(du)較慢;復(fu)(fu)合(he)(he)修(xiu)(xiu)(xiu)整(zheng)(zheng)(zheng) 法有電(dian)(dian)解(jie)電(dian)(dian)火花復(fu)(fu)合(he)(he)修(xiu)(xiu)(xiu)整(zheng)(zheng)(zheng)法,機械化學復(fu)(fu)合(he)(he)修(xiu)(xiu)(xiu)整(zheng)(zheng)(zheng)法等,修(xiu)(xiu)(xiu)整(zheng)(zheng)(zheng)效(xiao)果較好,但系統較復(fu)(fu)雜,因此(ci)燒(shao)結型金(jin)剛石(shi)砂輪的修(xiu)(xiu)(xiu)整(zheng)(zheng)(zheng)問題仍然沒有得(de) 到很(hen)好的解(jie)決.此(ci)外,由于砂輪的制造工(gong)(gong)藝決定了其表(biao)面形(xing)(xing)貌是隨機的,各磨粒的幾何形(xing)(xing)狀,分布及切(qie)削(xue)(xue)刃(ren)所處的高(gao)度(du)(du)不一(yi)致,因此(ci) 磨削(xue)(xue)時只有少數較高(gao)的切(qie)削(xue)(xue)刃(ren)切(qie)到工(gong)(gong)件(jian),限制了磨削(xue)(xue)質量(liang)和磨削(xue)(xue)效(xiao)率的進一(yi)步提高(gao).