鍛造法(fa)蘭(lan)鍛造法(fa)蘭(lan)是通(tong)過鍛打機(ji)(ji)的(de)無數(shu)次捶(chui)打，讓鋼(gang)材內部的(de)組織結構變(bian)得緊密，所(suo)以(yi)機(ji)(ji)械性能(neng)會比(bi)較好(hao)(hao)，強(qiang)度(du)也會高，白鐵皮(pi)異形(xing)管件定做，鍛造出來(lai)的(de)法(fa)蘭(lan)主要適用于那些壓(ya)力(li)較大的(de)管道中。首(shou)先是將圓(yuan)柱形(xing)的(de)鋼(gang)坯(pi)(pi)(pi)(pi)按照(zhao)一(yi)定尺(chi)寸切(qie)割下來(lai)，通(tong)過加(jia)熱到(dao)一(yi)定的(de)溫度(du)后讓其變(bian)成(cheng)(cheng)熱塑性，并放在(zai)冷鐓上讓鍛打機(ji)(ji)不斷的(de)捶(chui)打鋼(gang)坯(pi)(pi)(pi)(pi)，讓鋼(gang)坯(pi)(pi)(pi)(pi)內部更(geng)加(jia)緊實，力(li)學(xue)性能(neng)比(bi)原來(lai)的(de)鋼(gang)坯(pi)(pi)(pi)(pi)更(geng)加(jia)好(hao)(hao)。還要通(tong)過沖壓(ya)機(ji)(ji)在(zai)鋼(gang)坯(pi)(pi)(pi)(pi)上沖壓(ya)出法(fa)蘭(lan)上面的(de)圓(yuan)孔，成(cheng)(cheng)型的(de)毛(mao)坯(pi)(pi)(pi)(pi)法(fa)蘭(lan)要放入電爐中進行熱處(chu)理增加(jia)法(fa)蘭(lan)的(de)強(qiang)度(du)，后還要對法(fa)蘭(lan)毛(mao)坯(pi)(pi)(pi)(pi)切(qie)割拋光(guang)成(cheng)(cheng)為可以(yi)使用的(de)法(fa)蘭(lan)。

2.法(fa)蘭(lan)密(mi)(mi)(mi)(mi)封(feng)原理法(fa)蘭(lan)密(mi)(mi)(mi)(mi)封(feng)面(mian)(mian)泄漏(lou)的(de)(de)原因: ●密(mi)(mi)(mi)(mi)封(feng)墊表面(mian)(mian)與法(fa)蘭(lan)密(mi)(mi)(mi)(mi)封(feng)面(mian)(mian)之間(jian)有空隙，或截面(mian)(mian)內有毛細管—泄漏(lou)通(tong)(tong)道。  ●密(mi)(mi)(mi)(mi)封(feng)面(mian)(mian)兩側介質有壓差一(yi)推(tui)動(dong)力。 從法(fa)蘭(lan)密(mi)(mi)(mi)(mi)封(feng)連接過(guo)程看其密(mi)(mi)(mi)(mi)封(feng)原理: (1)安裝過(guo)程一(yi)擰緊螺(luo)栓，慶(qing)陽異形(xing)管件定(ding)做(zuo)，墊片(pian)被壓緊(墊內毛細管被切斷:消除了(le)與法(fa)蘭(lan)密(mi)(mi)(mi)(mi)封(feng)面(mian)(mian)之間(jian)的(de)(de)空隙)。墊片(pian)單位面(mian)(mian)積上所受的(de)(de)壓緊力，稱為(wei)(wei)墊片(pian)密(mi)(mi)(mi)(mi)封(feng)比壓。當墊片(pian)密(mi)(mi)(mi)(mi)封(feng)比壓達到某一(yi)值時(shi)，通(tong)(tong)風管道異形(xing)管件定(ding)做(zuo)，便具備了(le)初始密(mi)(mi)(mi)(mi)封(feng)條件，此時(shi)的(de)(de)比壓稱為(wei)(wei)預(yu)緊密(mi)(mi)(mi)(mi)封(feng)比壓。

鋼(gang)管(guan)(guan)(guan)(guan)(guan)外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)系(xi)(xi)(xi)(xi)列是管(guan)(guan)(guan)(guan)(guan)法(fa)蘭尺寸(cun)(cun)的基(ji)礎。我國目前生產和(he)(he)使用的鋼(gang)管(guan)(guan)(guan)(guan)(guan)，從外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)來分有兩個系(xi)(xi)(xi)(xi)列:標準中標注為(wei)(wei)“系(xi)(xi)(xi)(xi)列I”和(he)(he)“系(xi)(xi)(xi)(xi)列Ⅱ”，或(huo)稱(cheng)(cheng)(cheng)“A系(xi)(xi)(xi)(xi)列”及“B系(xi)(xi)(xi)(xi)列”。系(xi)(xi)(xi)(xi)列A的鋼(gang) 管(guan)(guan)(guan)(guan)(guan)為(wei)(wei)“英制管(guan)(guan)(guan)(guan)(guan)”，俗稱(cheng)(cheng)(cheng)“大(da)外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)”;系(xi)(xi)(xi)(xi)列B的鋼(gang)管(guan)(guan)(guan)(guan)(guan)為(wei)(wei)“公制管(guan)(guan)(guan)(guan)(guan)”，不(bu)銹(xiu)鋼(gang)異形管(guan)(guan)(guan)(guan)(guan)件(jian)定做，俗稱(cheng)(cheng)(cheng)“小外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)”  所(suo)謂“大(da)外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)及小外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)管(guan)(guan)(guan)(guan)(guan)”的含義是:在(zai)相同管(guan)(guan)(guan)(guan)(guan)道(dao)公稱(cheng)(cheng)(cheng)通徑(jing)(jing)(jing)的條(tiao)件(jian)下，管(guan)(guan)(guan)(guan)(guan)道(dao)附件(jian)(諸如(ru)法(fa)蘭、閥(fa)門、管(guan)(guan)(guan)(guan)(guan)件(jian)及管(guan)(guan)(guan)(guan)(guan)道(dao)過(guo)濾器等)所(suo)配(pei)(pei)用鋼(gang)管(guan)(guan)(guan)(guan)(guan)外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)尺寸(cun)(cun)的大(da)小，尺寸(cun)(cun)大(da)的叫“大(da)外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)”管(guan)(guan)(guan)(guan)(guan);尺寸(cun)(cun)小的叫“小外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)”管(guan)(guan)(guan)(guan)(guan)。 例如(ru):公稱(cheng)(cheng)(cheng)通經DN100的法(fa)蘭，配(pei)(pei)管(guan)(guan)(guan)(guan)(guan)外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)為(wei)(wei)114.3mm及108mm兩種(zhong)，外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)114.3mm的鋼(gang)管(guan)(guan)(guan)(guan)(guan)稱(cheng)(cheng)(cheng)為(wei)(wei)“大(da)外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)”管(guan)(guan)(guan)(guan)(guan)或(huo)“A系(xi)(xi)(xi)(xi)列”管(guan)(guan)(guan)(guan)(guan):外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)108mm的鋼(gang)管(guan)(guan)(guan)(guan)(guan)稱(cheng)(cheng)(cheng)為(wei)(wei)“小外(wai)(wai)(wai)(wai)(wai)(wai)(wai)徑(jing)(jing)(jing)”管(guan)(guan)(guan)(guan)(guan)或(huo)“B系(xi)(xi)(xi)(xi)列”管(guan)(guan)(guan)(guan)(guan)。