模(mo)(mo)具(ju)(ju)鋼(gang)(gang)大(da)致可分為：冷軋模(mo)(mo)具(ju)(ju)鋼(gang)(gang)、熱軋模(mo)(mo)具(ju)(ju)鋼(gang)(gang)和(he)塑料模(mo)(mo)具(ju)(ju)鋼(gang)(gang)三類，用(yong)于鍛(duan)造(zao)、沖(chong)壓、切型、壓鑄等(deng)。由于各種模(mo)(mo)具(ju)(ju)用(yong)途(tu)不同，工(gong)作條(tiao)件復雜，因此對模(mo)(mo)具(ju)(ju)用(yong)鋼(gang)(gang)，按(an)其所制造(zao)模(mo)(mo)具(ju)(ju)的工(gong)作條(tiao)件……

1、深孔鉆概念
在機械制造業中，一般將孔(kong)(kong)(kong)(kong)深超(chao)過(guo)孔(kong)(kong)(kong)(kong)徑10倍的圓柱(zhu)孔(kong)(kong)(kong)(kong)稱為深孔(kong)(kong)(kong)(kong)。深孔(kong)(kong)(kong)(kong)按孔(kong)(kong)(kong)(kong)深與孔(kong)(kong)(kong)(kong)徑之比（L/D）的大小(xiao)通常可(ke)分為一般深孔(kong)(kong)(kong)(kong)、中等深孔(kong)(kong)(kong)(kong)及特(te)殊深孔(kong)(kong)(kong)(kong)三種。

按影響程度排序:
1:工件材質(硬度密度越大的磨削后粗糙度越低,即越光滑);
2:磨料材(cai)質(zhi)(粒度(du)(du)越小硬度(du)(du)越高磨削后(hou)粗糙(cao)度(du)(du)越低,即越光滑)……