龍門銑床包(bao)括有床身、架(jia)(jia)設(she)在(zai)該床身上(shang)的(de)工作(zuo)臺及(ji)數控(kong)電(dian)路控(kong)制系統。工作(zuo)臺上(shang)方活動跨越架(jia)(jia)設(she)有龍門架(jia)(jia)，龍門架(jia)(jia)還(huan)包(bao)括有：龍門架(jia)(jia)拖(tuo)(tuo)板，龍門架(jia)(jia)拖(tuo)(tuo)板活動夾持于(yu)該X軸(zhou)(zhou)(zhou)導(dao)軌(gui)上(shang)。Z軸(zhou)(zhou)(zhou)導(dao)軌(gui)，裝設(she)于(yu)龍門架(jia)(jia)上(shang)。橫(heng)梁(liang)，該橫(heng)梁(liang)裝設(she)有一Z軸(zhou)(zhou)(zhou)拖(tuo)(tuo)板，橫(heng)梁(liang)通過該Z軸(zhou)(zhou)(zhou)拖(tuo)(tuo)板而活動夾持于(yu)該Z軸(zhou)(zhou)(zhou)導(dao)軌(gui)上(shang)，橫(heng)梁(liang)上(shang)還(huan)裝設(she)有Y軸(zhou)(zhou)(zhou)導(dao)軌(gui)。

銑(xian)削裝(zhuang)(zhuang)置(zhi)，龍(long)(long)門銑(xian)床(chuang)銑(xian)削裝(zhuang)(zhuang)置(zhi)活動裝(zhuang)(zhuang)設于(yu)該Y軸導軌(gui)上，使該龍(long)(long)門架在數控電路控制(zhi)系統的控制(zhi)下，作(zuo)X、Y、Z三軸的立體空間銑(xian)削加工。該數控龍(long)(long)門銑(xian)床(chuang)具(ju)有(you)高精度的銑(xian)、鉆、鏜、削等操作(zuo)。 

龍門銑(xian)(xian)床(chuang)是美(mei)國(guo)人(ren)惠特尼于(yu)1818年創(chuang)制的臥式銑(xian)(xian)床(chuang)；為了銑(xian)(xian)削麻花鉆頭的螺旋槽，美(mei)國(guo)人(ren)布朗于(yu)1862年創(chuang)制了第一(yi)臺萬能銑(xian)(xian)床(chuang)，這(zhe)是升降臺銑(xian)(xian)床(chuang)的雛形；1884年前(qian)后又出現了龍門銑(xian)(xian)床(chuang)；二十世紀20年代出現了半自動(dong)銑(xian)(xian)床(chuang)，工作臺利用(yong)擋塊可完成“進(jin)給-決速”或“決速-進(jin)給”的自動(dong)轉換。

具有(you)(you)門(men)(men)(men)式(shi)框架(jia)(jia)(jia)(jia)和(he)(he)(he)臥式(shi)長床(chuang)身的(de)(de)(de)(de)銑(xian)(xian)(xian)(xian)(xian)床(chuang)。龍(long)門(men)(men)(men)銑(xian)(xian)(xian)(xian)(xian)床(chuang)加(jia)(jia)(jia)(jia)工(gong)精度和(he)(he)(he)生產率均較(jiao)高(gao)，適(shi)合在成批和(he)(he)(he)大(da)量生產中加(jia)(jia)(jia)(jia)工(gong)大(da)型(xing)工(gong)件(jian)的(de)(de)(de)(de)平面(mian)和(he)(he)(he)斜面(mian)。數控龍(long)門(men)(men)(men)銑(xian)(xian)(xian)(xian)(xian)床(chuang)還可(ke)(ke)加(jia)(jia)(jia)(jia)工(gong)空間曲面(mian)和(he)(he)(he)一些特(te)(te)型(xing)零(ling)件(jian)。龍(long)門(men)(men)(men)銑(xian)(xian)(xian)(xian)(xian)床(chuang)由立(li)柱和(he)(he)(he)頂梁構(gou)成門(men)(men)(men)式(shi)框架(jia)(jia)(jia)(jia)。橫(heng)(heng)梁可(ke)(ke)沿兩(liang)立(li)柱導軌(gui)作(zuo)升降(jiang)運(yun)(yun)動(dong)(dong)。橫(heng)(heng)梁上(shang)(shang)有(you)(you)1～2個(ge)帶垂直主軸(zhou)的(de)(de)(de)(de)銑(xian)(xian)(xian)(xian)(xian)頭(tou)(tou)，可(ke)(ke)沿橫(heng)(heng)梁導軌(gui)作(zuo)橫(heng)(heng)向(xiang)運(yun)(yun)動(dong)(dong)。兩(liang)立(li)柱上(shang)(shang)還可(ke)(ke)分(fen)別(bie)安(an)裝一個(ge)帶有(you)(you)水平主軸(zhou)的(de)(de)(de)(de)銑(xian)(xian)(xian)(xian)(xian)頭(tou)(tou)，它可(ke)(ke)沿立(li)柱導軌(gui)作(zuo)升降(jiang)運(yun)(yun)動(dong)(dong)。這些銑(xian)(xian)(xian)(xian)(xian)頭(tou)(tou)可(ke)(ke)同(tong)時加(jia)(jia)(jia)(jia)工(gong)幾個(ge)表(biao)面(mian)。每個(ge)銑(xian)(xian)(xian)(xian)(xian)頭(tou)(tou)都具有(you)(you)單(dan)獨(du)的(de)(de)(de)(de)電動(dong)(dong)機、變速機構(gou)、操縱(zong)機構(gou)和(he)(he)(he)主軸(zhou)部件(jian)等。加(jia)(jia)(jia)(jia)工(gong)時，工(gong)件(jian)安(an)裝在工(gong)作(zuo)臺(tai)上(shang)(shang)并(bing)隨之作(zuo)縱(zong)向(xiang)進(jin)給運(yun)(yun)動(dong)(dong)。大(da)型(xing)龍(long)門(men)(men)(men)銑(xian)(xian)(xian)(xian)(xian)床(chuang)的(de)(de)(de)(de)總(zong)重(zhong)量達850噸。龍(long)門(men)(men)(men)銑(xian)(xian)(xian)(xian)(xian)床(chuang)還有(you)(you)一些變型(xing)以適(shi)應不(bu)(bu)同(tong)的(de)(de)(de)(de)加(jia)(jia)(jia)(jia)工(gong)對象(xiang)。①龍(long)門(men)(men)(men)銑(xian)(xian)(xian)(xian)(xian)鏜床(chuang)：橫(heng)(heng)梁上(shang)(shang)裝有(you)(you)可(ke)(ke)銑(xian)(xian)(xian)(xian)(xian)可(ke)(ke)鏜的(de)(de)(de)(de)銑(xian)(xian)(xian)(xian)(xian)鏜頭(tou)(tou)，其主軸(zhou)能(neng)(neng)作(zuo)軸(zhou)向(xiang)機動(dong)(dong)進(jin)給并(bing)有(you)(you)運(yun)(yun)動(dong)(dong)微調(diao)裝置,微調(diao)速度可(ke)(ke)低至5毫(hao)米(mi)/分(fen)。②橋(qiao)式(shi)龍(long)門(men)(men)(men)銑(xian)(xian)(xian)(xian)(xian)床(chuang)：加(jia)(jia)(jia)(jia)工(gong)時工(gong)作(zuo)臺(tai)和(he)(he)(he)工(gong)件(jian)不(bu)(bu)動(dong)(dong),而(er)由龍(long)門(men)(men)(men)架(jia)(jia)(jia)(jia)移(yi)動(dong)(dong)。其特(te)(te)點是占(zhan)地(di)面(mian)積小，承(cheng)載能(neng)(neng)力大(da)，龍(long)門(men)(men)(men)架(jia)(jia)(jia)(jia)行程可(ke)(ke)達20米(mi)，便于加(jia)(jia)(jia)(jia)工(gong)特(te)(te)長或特(te)(te)重(zhong)的(de)(de)(de)(de)工(gong)件(jian)外形與龍(long)門(men)(men)(men)刨床(chuang)相似，區別(bie)在于它的(de)(de)(de)(de)橫(heng)(heng)梁和(he)(he)(he)立(li)柱上(shang)(shang)裝的(de)(de)(de)(de)不(bu)(bu)是刨刀刀架(jia)(jia)(jia)(jia)而(er)是帶有(you)(you)主軸(zhou)箱(xiang)的(de)(de)(de)(de)銑(xian)(xian)(xian)(xian)(xian)刀架(jia)(jia)(jia)(jia)，并(bing)且龍(long)門(men)(men)(men)銑(xian)(xian)(xian)(xian)(xian)床(chuang)的(de)(de)(de)(de)縱(zong)向(xiang)工(gong)作(zuo)臺(tai)的(de)(de)(de)(de)往復運(yun)(yun)動(dong)(dong)不(bu)(bu)是主運(yun)(yun)動(dong)(dong)，而(er)是進(jin)給運(yun)(yun)動(dong)(dong)，而(er)銑(xian)(xian)(xian)(xian)(xian)刀的(de)(de)(de)(de)旋轉運(yun)(yun)動(dong)(dong)是主運(yun)(yun)動(dong)(dong)。