龍門刨床身主要(yao)用于刨削大型工件(jian)，也(ye)可(ke)在工作臺上裝夾(jia)多個零件(jian)同時加工，是工業(ye)的母機。龍(long)門刨床的工作臺帶著工件(jian)通(tong)過門式(shi)框(kuang)架作直線往(wang)復運(yun)動，空(kong)行程速度(du)大于工作行程速度(du)。橫梁上一(yi)般(ban)裝有兩個垂直刀(dao)架，刀(dao)架滑座可(ke)在垂直面(mian)內回(hui)轉一(yi)個角度(du)，并可(ke)沿橫梁作橫向進給(gei)運(yun)動。

龍(long)(long)門(men)刨(bao)床(chuang)具(ju)有(you)門(men)式(shi)框架和(he)臥式(shi)長(chang)床(chuang)身的(de)(de)刨(bao)床(chuang)。龍(long)(long)門(men)刨(bao)床(chuang)主(zhu)要用(yong)(yong)于(yu)刨(bao)削(xue)大(da)型工(gong)(gong)(gong)(gong)件(jian)，也可(ke)(ke)(ke)在(zai)(zai)工(gong)(gong)(gong)(gong)作(zuo)臺(tai)(tai)上(shang)裝夾多(duo)個(ge)(ge)(ge)零件(jian)同時(shi)加(jia)工(gong)(gong)(gong)(gong)，是工(gong)(gong)(gong)(gong)業的(de)(de)母機。龍(long)(long)門(men)刨(bao)床(chuang)的(de)(de)工(gong)(gong)(gong)(gong)作(zuo)臺(tai)(tai)帶著(zhu)工(gong)(gong)(gong)(gong)件(jian)通(tong)過門(men)式(shi)框架作(zuo)直(zhi)(zhi)線往復(fu)運(yun)(yun)動(dong)(dong)，空行程(cheng)速(su)(su)度(du)大(da)于(yu)工(gong)(gong)(gong)(gong)作(zuo)行程(cheng)速(su)(su)度(du)。橫(heng)(heng)梁(liang)上(shang)一(yi)(yi)般裝有(you)兩個(ge)(ge)(ge)垂直(zhi)(zhi)刀(dao)(dao)架，刀(dao)(dao)架滑座可(ke)(ke)(ke)在(zai)(zai)垂直(zhi)(zhi)面內回(hui)轉一(yi)(yi)個(ge)(ge)(ge)角(jiao)度(du)，并可(ke)(ke)(ke)沿橫(heng)(heng)梁(liang)作(zuo)橫(heng)(heng)向進(jin)(jin)(jin)給運(yun)(yun)動(dong)(dong)；刨(bao)刀(dao)(dao)可(ke)(ke)(ke)在(zai)(zai)刀(dao)(dao)架上(shang)作(zuo)垂直(zhi)(zhi)或斜(xie)向進(jin)(jin)(jin)給運(yun)(yun)動(dong)(dong)；橫(heng)(heng)梁(liang)可(ke)(ke)(ke)在(zai)(zai)兩立柱上(shang)作(zuo)上(shang)下調整(zheng)。一(yi)(yi)般在(zai)(zai)兩個(ge)(ge)(ge)立柱上(shang)還安裝可(ke)(ke)(ke)沿立柱上(shang)下移動(dong)(dong)的(de)(de)側刀(dao)(dao)架，以擴大(da)加(jia)工(gong)(gong)(gong)(gong)范圍(wei)工(gong)(gong)(gong)(gong)作(zuo)臺(tai)(tai)回(hui)程(cheng)時(shi)能機動(dong)(dong)抬(tai)刀(dao)(dao)，以免(mian)劃傷工(gong)(gong)(gong)(gong)件(jian)表(biao)面。機床(chuang)工(gong)(gong)(gong)(gong)作(zuo)臺(tai)(tai)的(de)(de)驅動(dong)(dong)可(ke)(ke)(ke)用(yong)(yong)發(fa)電機－電動(dong)(dong)機組(zu)或用(yong)(yong)可(ke)(ke)(ke)控(kong)硅直(zhi)(zhi)流調速(su)(su)方式(shi)，調速(su)(su)范圍(wei)較(jiao)大(da)，在(zai)(zai)低速(su)(su)時(shi)也能獲(huo)得較(jiao)大(da)的(de)(de)驅動(dong)(dong)力。有(you)的(de)(de)龍(long)(long)門(men)刨(bao)床(chuang)還附有(you)銑(xian)頭和(he)磨(mo)頭，變型為龍(long)(long)門(men)刨(bao)銑(xian)床(chuang)和(he)龍(long)(long)門(men)刨(bao)銑(xian)磨(mo)床(chuang)，工(gong)(gong)(gong)(gong)作(zuo)臺(tai)(tai)既(ji)可(ke)(ke)(ke)作(zuo)的(de)(de)主(zhu)運(yun)(yun)動(dong)(dong)，也可(ke)(ke)(ke)作(zuo)慢速(su)(su)的(de)(de)進(jin)(jin)(jin)給運(yun)(yun)動(dong)(dong)，主(zhu)要用(yong)(yong)于(yu)重型工(gong)(gong)(gong)(gong)件(jian)在(zai)(zai)一(yi)(yi)次(ci)安裝中進(jin)(jin)(jin)行刨(bao)削(xue)、銑(xian)削(xue)和(he)磨(mo)削(xue)平面等加(jia)工(gong)(gong)(gong)(gong)。