大口徑厚壁管的(de)(de)
原料是(shi)圓(yuan)(yuan)管(guan)(guan)坯(pi),圓(yuan)(yuan)管(guan)(guan)胚(pei)要經過切(qie)割(ge)機(ji)的(de)(de)切(qie)割(ge)加工成(cheng)長(chang)度(du)(du)約為(wei)(wei)1米的(de)(de)坯(pi)料,并(bing)經傳(chuan)送(song)(song)帶送(song)(song)到熔爐內(nei)加熱。鋼坯(pi)被送(song)(song)入熔爐內(nei)加熱,溫(wen)度(du)(du)大約為(wei)(wei)1200攝氏度(du)(du)。燃料為(wei)(wei)
氫氣或乙(yi)炔(gui)。爐內(nei)溫(wen)度(du)(du)控制是(shi)關鍵性的(de)(de)問(wen)題(ti).圓(yuan)(yuan)管(guan)(guan)坯(pi)出(chu)爐后要經過壓(ya)力(li)穿(chuan)(chuan)孔(kong)(kong)機(ji)進行穿(chuan)(chuan)空。一般(ban)較常見的(de)(de)穿(chuan)(chuan)孔(kong)(kong)機(ji)是(shi)錐形(xing)輥穿(chuan)(chuan)孔(kong)(kong)機(ji),這種(zhong)穿(chuan)(chuan)孔(kong)(kong)機(ji)生產效率高(gao),產品質量
好,穿(chuan)(chuan)孔(kong)(kong)擴徑(jing)(jing)量大,可穿(chuan)(chuan)多種(zhong)鋼種(zhong)。穿(chuan)(chuan)孔(kong)(kong)后,圓(yuan)(yuan)管(guan)(guan)坯(pi)就(jiu)先(xian)后被三輥斜(xie)軋(ya)、連(lian)軋(ya)或擠壓(ya)。擠壓(ya)后要脫管(guan)(guan)定徑(jing)(jing)。定徑(jing)(jing)機(ji)通過錐形(xing)鉆頭(tou)高(gao)速旋轉入鋼胚(pei)打孔(kong)(kong),形(xing)成(cheng)鋼管(guan)(guan)。鋼
管(guan)(guan)內(nei)徑(jing)(jing)由定徑(jing)(jing)機(ji)鉆頭(tou)的(de)(de)外徑(jing)(jing)長(chang)度(du)(du)來確定。
鋼(gang)管(guan)(guan)經定(ding)徑后(hou),進(jin)入(ru)冷(leng)卻塔中,通(tong)過噴水冷(leng)卻,鋼(gang)管(guan)(guan)經冷(leng)卻后(hou),就要被(bei)矯直(zhi)(zhi)。鋼(gang)管(guan)(guan)經矯直(zhi)(zhi)后(hou)由傳(chuan)送帶(dai)送至金屬探(tan)傷機(或(huo)水壓實驗)進(jin)行內部探(tan)傷。若(ruo)鋼(gang)管(guan)(guan)內部有
裂紋,氣泡等問題,將被(bei)探(tan)測(ce)出。鋼(gang)管(guan)(guan)質(zhi)檢后(hou)還(huan)要通(tong)過嚴(yan)格的手工挑選。鋼(gang)管(guan)(guan)質(zhi)檢后(hou),用油漆(qi)噴上編號、規(gui)格、生產(chan)批號等。
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