臥式(shi)(shi)鏜床(chuang)(chuang)是(shi)鏜床(chuang)(chuang)中應用(yong)廣(guang)泛(fan)的(de)種(zhong)。它主(zhu)要是(shi)孔(kong)加工(gong)(gong)(gong)(gong)，鏜孔(kong)精度(du)可達IT7，除擴大工(gong)(gong)(gong)(gong)件(jian)上已鑄(zhu)出(chu)或已加工(gong)(gong)(gong)(gong)的(de)孔(kong)外，臥式(shi)(shi)鏜床(chuang)(chuang)還能銑削平面、鉆削、加工(gong)(gong)(gong)(gong)面和凸緣(yuan)的(de)外圓(yuan)，以及切螺紋(wen)等，主(zhu)要用(yong)在單件(jian)小批量生(sheng)產和修(xiu)理車間，加工(gong)(gong)(gong)(gong)孔(kong)的(de)圓(yuan)度(du)誤差不(bu)超過 5微米，表(biao)面粗(cu)糙(cao)度(du)為(wei)Ra0.63～1.25微米。臥式(shi)(shi)鏜床(chuang)(chuang)的(de)主(zhu)參數為(wei)主(zhu)軸直(zhi)徑。
結構組成
 主軸水平(ping)布置、主軸箱能沿前(qian)立柱導軌(gui)垂直(zhi)移動的鏜床）。使用臥式鏜床加(jia)工時(shi)，刀具裝在主軸、鏜桿或(huo)平(ping)旋(xuan)盤上，通過主軸箱可獲得需要的各(ge)種(zhong)轉速(su)和進給量，同(tong)時(shi)可隨著主軸箱沿前(qian)立柱的導軌(gui)上下移動。
工(gong)(gong)件安(an)裝在(zai)工(gong)(gong)作(zuo)臺(tai)上，工(gong)(gong)作(zuo)臺(tai)可隨下滑座(zuo)(zuo)和上滑座(zuo)(zuo)作(zuo)縱橫(heng)向移動，還可繞上滑座(zuo)(zuo)的圓導(dao)(dao)軌回轉(zhuan)至(zhi)所需要(yao)的角度(du)，以適應各(ge)種加(jia)工(gong)(gong)情況。當鏜桿較長時，可用后立柱上的尾架來支承其，以增加(jia)剛度(du)。 為了加(jia)工(gong)(gong)大孔距工(gong)(gong)件或長箱體(ti)，有的臥式(shi)鏜床把工(gong)(gong)作(zuo)臺(tai)橫(heng)向行程加(jia)大兩倍左右(you)，采用加(jia)大床身主導(dao)(dao)軌寬度(du)和帶輔助導(dao)(dao)軌的方法增加(jia)下滑座(zuo)(zuo)剛度(du)。
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